Advanced Materials

Cover image for Vol. 26 Issue 22

June 11, 2014

Volume 26, Issue 22

Pages 3569–3772

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Inside Back Cover
    5. Back Cover
    6. Masthead
    7. Contents
    8. Progress Reports
    9. Reviews
    10. Communications
    11. Frontispiece
    12. Communications
    1. You have free access to this content
      Organic Electronics: Flexible, Low-Voltage and High-Performance Polymer Thin-Film Transistors and Their Application in Photo/Thermal Detectors (Adv. Mater. 22/2014) (page 3569)

      Xiaotong Liu, Yunlong Guo, Yongqiang Ma, Huajie Chen, Zupan Mao, Hanlin Wang, Gui Yu and Yunqi Liu

      Version of Record online: 5 JUN 2014 | DOI: 10.1002/adma.201470145

      Thumbnail image of graphical abstract

      Low-voltage (≤−3 V) and flexible polymer thin-film transistors are successfully fabricated, and their applications in photo-/thermal detectors are reported by Y. Q. Liu, G. Yu, Y. Q. Ma, Y. L. Guo, and co-workers on page 3631. A high mobility of 11.0 cm2 V−1 s−1 is achieved by employing diketopyrrolopyrrole-based copolymers. Meanwhile, good responses to light and temperature of these flexible, lowvoltage devices are realized; thus they may have potential applications for electronic eyes and skin.

  2. Inside Front Cover

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Inside Back Cover
    5. Back Cover
    6. Masthead
    7. Contents
    8. Progress Reports
    9. Reviews
    10. Communications
    11. Frontispiece
    12. Communications
    1. You have free access to this content
      Graphene: Guiding Stem Cell Differentiation into Oligodendrocytes Using Graphene-Nanofiber Hybrid Scaffolds (Adv. Mater. 22/2014) (page 3570)

      Shreyas Shah, Perry T. Yin, Thiers M. Uehara, Sy-Tsong Dean Chueng, Letao Yang and Ki-Bum Lee

      Version of Record online: 5 JUN 2014 | DOI: 10.1002/adma.201470146

      Thumbnail image of graphical abstract

      By combining the unique properties of nanofibers and graphene-based nanomaterials in a single biocompatible scaffold, K.-B. Lee and co-workers report the selective differentiation of stem cells into mature oligodendrocytes on page 3673. Given the role of oligodendrocytes in myelinating the axon of a neuron, these graphene-nanofiber hybrid scaffolds may prove to be useful in treating injuries and diseases of the central nervous system.

  3. Inside Back Cover

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Inside Back Cover
    5. Back Cover
    6. Masthead
    7. Contents
    8. Progress Reports
    9. Reviews
    10. Communications
    11. Frontispiece
    12. Communications
    1. You have free access to this content
      Polyimide Membranes: Ultra-Microporous Triptycene-based Polyimide Membranes for High-Performance Gas Separation (Adv. Mater. 22/2014) (page 3775)

      Bader S. Ghanem, Raja Swaidan, Eric Litwiller and Ingo Pinnau

      Version of Record online: 5 JUN 2014 | DOI: 10.1002/adma.201470150

      Thumbnail image of graphical abstract

      Polymer membranes perform key industrial gas separations. Three-dimensional bridgehead-substituted triptycene moieties integrated into rigid polymer backbones are shown to yield highly permeable and exceptionally sieving membranes, as shown by I. Pinnau and co-workers on page 3688. These transparent, flexible, and robust materials are illustrated in this cover image by O. Kasimova.

  4. Back Cover

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Inside Back Cover
    5. Back Cover
    6. Masthead
    7. Contents
    8. Progress Reports
    9. Reviews
    10. Communications
    11. Frontispiece
    12. Communications
    1. You have free access to this content
      Peptide Arrays: High-Density Peptide Arrays with Combinatorial Laser Fusing (Adv. Mater. 22/2014) (page 3776)

      Frieder Maerkle, Felix F. Loeffler, Sebastian Schillo, Tobias Foertsch, Bastian Muenster, Jakob Striffler, Christopher Schirwitz, F. Ralf Bischoff, Frank Breitling and Alexander Nesterov-Mueller

      Version of Record online: 5 JUN 2014 | DOI: 10.1002/adma.201470151

      Thumbnail image of graphical abstract

      A novel method for the combinatorial synthesis of high-density peptide arrays is illustrated by A. Nesterov-Mueller, F. R. Breitling, and co-workers on page 3730. A laser beam melts polymer particles with embedded amino acids and forms perfect hemispheres – the microsized reaction chambers in which the combinatorial chemistry is conducted. In each microreactor, a different reaction can be activated at the same time.

  5. Masthead

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Inside Back Cover
    5. Back Cover
    6. Masthead
    7. Contents
    8. Progress Reports
    9. Reviews
    10. Communications
    11. Frontispiece
    12. Communications
    1. You have free access to this content
      Masthead: (Adv. Mater. 22/2014)

      Version of Record online: 5 JUN 2014 | DOI: 10.1002/adma.201470148

  6. Contents

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Inside Back Cover
    5. Back Cover
    6. Masthead
    7. Contents
    8. Progress Reports
    9. Reviews
    10. Communications
    11. Frontispiece
    12. Communications
    1. You have free access to this content
  7. Progress Reports

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Inside Back Cover
    5. Back Cover
    6. Masthead
    7. Contents
    8. Progress Reports
    9. Reviews
    10. Communications
    11. Frontispiece
    12. Communications
    1. Theoretical Comparison, Equivalent Transformation, and Conjunction Operations of Electromagnetic Induction Generator and Triboelectric Nanogenerator for Harvesting Mechanical Energy (pages 3580–3591)

      Chi Zhang, Wei Tang, Changbao Han, Fengru Fan and Zhong Lin Wang

      Version of Record online: 27 MAR 2014 | DOI: 10.1002/adma.201400207

      Thumbnail image of graphical abstract

      The comparison and analysis of EMIG and TENG in theory and experiment are presented, which provide appropriate evidences of the TENG's effectiveness as a current source with a large internal resistance and establish the basis of using the TENG as a new energy technology that could be equivalently important as the EMIG for general power application.

  8. Reviews

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Inside Back Cover
    5. Back Cover
    6. Masthead
    7. Contents
    8. Progress Reports
    9. Reviews
    10. Communications
    11. Frontispiece
    12. Communications
    1. Materials and Structures for Stretchable Energy Storage and Conversion Devices (pages 3592–3617)

      Keyu Xie and Bingqing Wei

      Version of Record online: 18 MAR 2014 | DOI: 10.1002/adma.201305919

      Thumbnail image of graphical abstract

      Stretchable energy storage and conversion devices (ESCDs) are of great interest for their potential applications in realistic consumer products, ranging from portable electronics, bio-integrated devices, space satellites, and electric vehicles to buildings with arbitrarily shaped surfaces. Rational design and engineering of materials and/or structures for stretchable ESCDs are crucial to tackle enormous challenges to satisfy the evergrowing needs arising from these above-mentioned fields. The latest advances in the exploration and development of stretchable materials and structures are reviewed and the fundamental insights, challenges, and prospects of stretchable ESCDs are discussed.

  9. Communications

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Inside Back Cover
    5. Back Cover
    6. Masthead
    7. Contents
    8. Progress Reports
    9. Reviews
    10. Communications
    11. Frontispiece
    12. Communications
    1. Interfacial Engineering of Ultrathin Metal Film Transparent Electrode for Flexible Organic Photovoltaic Cells (pages 3618–3623)

      Jingyu Zou, Chang-Zhi Li, Chih-Yu Chang, Hin-Lap Yip and Alex K.-Y. Jen

      Version of Record online: 13 MAR 2014 | DOI: 10.1002/adma.201306212

      Thumbnail image of graphical abstract

      A generally applicable method has been developed for fabricating highly transparent ultrathin Ag films on both glass and plastic substrates using the self-assembled monolayer modified ZnO/Ag/ZnO tri-layer structure. The resulting films show remarkably low surface roughness with very high transparency (>80% between 400 and 600 nm) and low surface resistance (8.61 Ω/□). With an inverted architecture, the devices based on the SAM modified tri-layer UTMF electrode show superior performance and mechanical properties than those using ITO electrode on both glass and plastic substrates.

    2. High Polymer/Fullerene Ratio Realized in Efficient Polymer Solar Cells by Tailoring of the Polymer Side-Chains (pages 3624–3630)

      Jianyu Yuan, Huilong Dong, Ming Li, Xiaodong Huang, Jun Zhong, Youyong Li and Wanli Ma

      Version of Record online: 14 MAR 2014 | DOI: 10.1002/adma.201305577

      Thumbnail image of graphical abstract

      The introduction of “double aromatic side-chains” to the existing polymer backbone is an effective approach to obtain high performance polymer solar cells with low fullerene and additive concentrations, leading to improved absorbance for thin film and more environment-friendly processing.

    3. Flexible, Low-Voltage and High-Performance Polymer Thin-Film Transistors and Their Application in Photo/Thermal Detectors (pages 3631–3636)

      Xiaotong Liu, Yunlong Guo, Yongqiang Ma, Huajie Chen, Zupan Mao, Hanlin Wang, Gui Yu and Yunqi Liu

      Version of Record online: 17 MAR 2014 | DOI: 10.1002/adma.201306084

      Thumbnail image of graphical abstract

      Flexible, low-voltage electronic devices with a good response to light and temperature are constructed from newly realized high-performance polymer thin-film transistors (PTFTs) based on diketopyrrolopyrrole-based copolymers. The performance of the devices, combined with the high mobility of the PTFTs and their simple solution processing, makes the PTFTs promising for future low-power electronic applications, such as in photo/thermal detectors.

  10. Frontispiece

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Inside Back Cover
    5. Back Cover
    6. Masthead
    7. Contents
    8. Progress Reports
    9. Reviews
    10. Communications
    11. Frontispiece
    12. Communications
    1. You have free access to this content
      Supercapacitors: A Mechanically and Electrically Self-Healing Supercapacitor (Adv. Mater. 22/2014) (page 3637)

      Hua Wang, Bowen Zhu, Wencao Jiang, Yun Yang, Wan Ru Leow, Hong Wang and Xiaodong Chen

      Version of Record online: 5 JUN 2014 | DOI: 10.1002/adma.201470149

      Thumbnail image of graphical abstract

      On page 3638, X. Chen and co-workers design and fabricate a mechanically and electrically selfhealing supercapacitor, which shows potential for sustainable and durable electronic devices. Upon being damaged or deformed, the device can self-restore by simply bringing the separated parts into contact, which is analogous to zipping up a coat.

  11. Communications

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Inside Back Cover
    5. Back Cover
    6. Masthead
    7. Contents
    8. Progress Reports
    9. Reviews
    10. Communications
    11. Frontispiece
    12. Communications
    1. A Mechanically and Electrically Self-Healing Supercapacitor (pages 3638–3643)

      Hua Wang, Bowen Zhu, Wencao Jiang, Yun Yang, Wan Ru Leow, Hong Wang and Xiaodong Chen

      Version of Record online: 19 FEB 2014 | DOI: 10.1002/adma.201305682

      Thumbnail image of graphical abstract

      The first mechanically and electrically self-healing supercapacitor has been successfully fabricated. It exhibits excellent self-healing performance with the restoration of the specific capacitance up to 85.7% of its original value even after the 5th mechanical cutting. This achievement may provide a way to expand the lifetime of future energy storage devices and endow them with desirable economic and human safety attributes, as well as promote the development of next-generation self-healing electronics.

    2. Highly Selective and Permeable Porous Organic Framework Membrane for CO2 Capture (pages 3644–3648)

      Xue Gao, Xiaoqin Zou, Heping Ma, Shuang Meng and Guangshan Zhu

      Version of Record online: 20 MAR 2014 | DOI: 10.1002/adma.201400020

      Thumbnail image of graphical abstract

      POF integrated membrane: CO2-philic porous organic framework (POF) membranes are facilely synthesized by integrating SNW-1 nanosized particles with available amino groups and PSF matrix. As-prepared continuous SNW-1/PSF membrane is demonstrated to exhibit high CO2 selectivity as a molecular strainer. High performance (high separation factor and enhanced permeability) holds great promise of SNW-1/PSF membrane in CO2 capture and separation.

    3. Bipolar Electrochemical Mechanism for Mass Transfer in Nanoionic Resistive Memories (pages 3649–3654)

      Xuezeng Tian, Shize Yang, Min Zeng, Lifen Wang, Jiake Wei, Zhi Xu, Wenlong Wang and Xuedong Bai

      Version of Record online: 14 MAR 2014 | DOI: 10.1002/adma.201400127

      Thumbnail image of graphical abstract

      Getting a grip on the switching mechanism in nanoionic resistive memories: the bipolar electrochemical mechanism for mass transfer of Ag in nanoscale SiO2 is disclosed. The in-situ atomic-level experiments provide detailed evidence of the mass-transfer process under external electric fields. The mass transfer of Ag directly leads to conductive filament formation and disruption, which is responsible for the switching mechanism in nanoionic resistive memories.

    4. Synthesis of a Water-Soluble Conjugated Polymer Based on Thiophene for an Aqueous-Processed Hybrid Photovoltaic and Photodetector Device (pages 3655–3661)

      Haotong Wei, Gan Jin, Lei Wang, Li Hao, Tianyi Na, Yan Wang, Wenjing Tian, Haizhu Sun, Hongxing Zhang, Haiyu Wang, Hao Zhang and Bai Yang

      Version of Record online: 21 MAR 2014 | DOI: 10.1002/adma.201305500

      Thumbnail image of graphical abstract

      A water-soluble polymer (PWTV) is synthesized and applied to aqueous-processed hybrid solar cells and photodetectors. PWTV can supply an effective secondary bond to the CdTe colloidal quantum dots. The hybrid PWTV:CdTe material exhibits excellent photoelectric properties, and the devices have a power conversion efficiency of 4.1%. In addition, the device shows good light-response properties, and it is sensitive to a wide spectrum range.

    5. Combined Detection of Cancer Cells and a Tumor Biomarker using an Immunomagnetic Sensor for the Improvement of Prostate-Cancer Diagnosis (pages 3662–3666)

      Hung-Wei Yang, Chih-Wen Lin, Mu-Yi Hua, Shih-Sheng Liao, Ying-Tzu Chen, Hsiao-Chien Chen, Wen-Hui Weng, Cheng-Keng Chuang, See-Tong Pang and Chen-Chi M. Ma

      Version of Record online: 20 MAR 2014 | DOI: 10.1002/adma.201305842

      Thumbnail image of graphical abstract

      Capture and detection of both a relevant antigen and cancer cells are demonstrated using magnetic graphene oxide (MGO) possessing conjugated antibodies. By simply dropping the MGO onto the surface of Pt electrodes while in a magnetic field, the sensor is rapidly constructed. The dual approach of the sensor potentially offers a more accurate, rapid platform than current tests based on immunological methods.

    6. Mechanical Control of Surface Adsorption by Nanoscale Cracking (pages 3667–3672)

      Qiang Zhuang, Scott C. Warren, Bilge Baytekin, Ahmet F. Demirörs, Pramod P. Pillai, Bartlomiej Kowalczyk, H. Tarik Baytekin and Bartosz Grzybowski

      Version of Record online: 7 APR 2014 | DOI: 10.1002/adma.201306335

      Thumbnail image of graphical abstract

      In materials design, cracks are often avoided rather than sought. Here, several design principles are implemented that allow cracks to be formed with high reproducibility and control. We show how strains applied to flexible substrates produce nanoscopic cracks mediating size-, shape- and location-selective deposition of nanomaterials.

    7. Guiding Stem Cell Differentiation into Oligodendrocytes Using Graphene-Nanofiber Hybrid Scaffolds (pages 3673–3680)

      Shreyas Shah, Perry T. Yin, Thiers M. Uehara, Sy-Tsong Dean Chueng, Letao Yang and Ki-Bum Lee

      Version of Record online: 26 MAR 2014 | DOI: 10.1002/adma.201400523

      Thumbnail image of graphical abstract

      Graphene-nanofiber hybrid scaffolds selectively guide the differentiation of neural stem cells into mature oligodendro­cytes, which are the myelinating cells of the central nervous system. Moreover, this process is facilitated without introducing differentiation inducers into the culture media, underscoring the potential of a biomaterials-approach for neural tissue engineering.

    8. A Universal Strategy to Prepare Functional Porous Graphene Hybrid Architectures (pages 3681–3687)

      Zhiqiang Niu, Lili Liu, Li Zhang, Qi Shao, Weiya Zhou, Xiaodong Chen and Sishen Xie

      Version of Record online: 24 MAR 2014 | DOI: 10.1002/adma.201400143

      Thumbnail image of graphical abstract

      A universal approach is developed to prepare three-dimensional porous graphene architectures decorated with various nanomaterials via hydrothermal co-assembly. The obtained porous hybrid architectures show enhanced performance in energy storage and conversion.

    9. Ultra-Microporous Triptycene-based Polyimide Membranes for High-Performance Gas Separation (pages 3688–3692)

      Bader S. Ghanem, Raja Swaidan, Eric Litwiller and Ingo Pinnau

      Version of Record online: 11 MAR 2014 | DOI: 10.1002/adma.201306229

      Thumbnail image of graphical abstract

      A highly permeable and highly selective polyimide of intrinsic microporosity is prepared using a 9,10-diisopropyl-triptycene contortion center. The three-dimensionality and shape-persistence of triptycene afford exceptional sieving-based gas separation performance transcending the latest permeability/selectivity trade-offs for industrial gas separations involving oxygen and hydrogen.

    10. Oxide Resistive Memory with Functionalized Graphene as Built-in Selector Element (pages 3693–3699)

      Yuchao Yang, Jihang Lee, Seunghyun Lee, Che-Hung Liu, Zhaohui Zhong and Wei Lu

      Version of Record online: 18 MAR 2014 | DOI: 10.1002/adma.201400270

      Thumbnail image of graphical abstract

      A resistive memory with graphene electrodes is demonstrated. The spontaneous functionalization of graphene during device fabrication results in insulator-metal transition-like volatile threshold switching, creating a 1 selector – 1 resistor (1S1R) structure with a built-in selector and leading to a desirable highly nonlinear on-state behavior of the oxide resistive memory.

    11. Ionic Liquid-Assisted Synthesis of Microporous Carbon Nanosheets for Use in High Rate and Long Cycle Life Supercapacitors (pages 3700–3705)

      Zhen-Yu Jin, An-Hui Lu, Yuan-Yuan Xu, Jin-Tao Zhang and Wen-Cui Li

      Version of Record online: 20 MAR 2014 | DOI: 10.1002/adma.201306273

      Thumbnail image of graphical abstract

      Microporous carbon sheets with precisely controlled thickness, narrow pores, short diffusion paths, high electrical conductive networks, and good wettability are synthesized using very low amounts of graphene sheets as a shape-directing agent via an ionic liquid-assisted surface coating method. When used as the electrode for supercapacitors, the sheets demonstrate excellent rate capability, good cycle stability, high specific capacitance, and high energy/power density.

    12. Highly Stretchable Polymer Transistors Consisting Entirely of Stretchable Device Components (pages 3706–3711)

      Minkwan Shin, Jun Hyuk Song, Guh-Hwan Lim, Byungkwon Lim, Jong-Jin Park and Unyong Jeong

      Version of Record online: 24 MAR 2014 | DOI: 10.1002/adma.201400009

      Thumbnail image of graphical abstract

      Wrinkle-free stretchable organic transistors are fabricated using stretchable device components (substrate, electrodes, dielectric, active layer). The stretchable device showed no degradation during repeated cycles of stretching at ε = 0.7.

    13. Fabricating Shaped Microfibers with Inertial Microfluidics (pages 3712–3717)

      Janine K. Nunes, Chueh-Yu Wu, Hamed Amini, Keegan Owsley, Dino Di Carlo and Howard A. Stone

      Version of Record online: 24 MAR 2014 | DOI: 10.1002/adma.201400268

      Thumbnail image of graphical abstract

      A process for the fabrication of shaped microfibers is developed that combines software-enabled inertial microfluidics and photopolymerization. Flow deformations caused by flow around pillars sculpt the shape of a stream of reactive solution, which is photopolymerized into a fiber. The cross-sectional shapes and selective surface functionalization of the fibers compare well with the predicted shapes of the sculpted streams.

    14. Rational Design of Synthetic Nanoparticles with a Large Reversible Shift of Acid Dissociation Constants: Proton Imprinting in Stimuli Responsive Nanogel Particles (pages 3718–3723)

      Yu Hoshino, Ryohei C. Ohashi and Yoshiko Miura

      Version of Record online: 17 MAR 2014 | DOI: 10.1002/adma.201305957

      Thumbnail image of graphical abstract

      Temperature-responsive nanogel particles with acids exhibiting large and reversible pK a shift are prepared by an ion-imprinting polymerization of stimuli responsive monomers, cross-linkers, and acidic monomers using protons as a template. The principles employed here should be broadly applicable to other stimuli-responsive materials and will be an integral step in the production of active proton transporter.

    15. Electrically Conductive Ultrananocrystalline Diamond-Coated Natural Graphite-Copper Anode for New Long Life Lithium-Ion Battery (pages 3724–3729)

      Yin-Wei Cheng, Chi-Kai Lin, Yueh-Chieh Chu, Ali Abouimrane, Zonghai Chen, Yang Ren, Chuan-Pu Liu, Yonhua Tzeng and Orlando Auciello

      Version of Record online: 24 MAR 2014 | DOI: 10.1002/adma.201400280

      Thumbnail image of graphical abstract

      Science and technology are presented for novel nitrogen-incorporated ultrananocrystalline diamond (N-UNCD) encapsulated NG/copper anode and UNCD coatings that may enable next generation Li-ion batteries (LIBs) with potential 10x longer lifetime and superior performance than current LIBs. N-UNCD films (∼5–10 nm grain size) exhibit electrical conductivity and extreme resistance to chemical corrosion, providing superior performance with respect to current uncoated anodes.

    16. High-Density Peptide Arrays with Combinatorial Laser Fusing (pages 3730–3734)

      Frieder Maerkle, Felix F. Loeffler, Sebastian Schillo, Tobias Foertsch, Bastian Muenster, Jakob Striffler, Christopher Schirwitz, F. Ralf Bischoff, Frank Breitling and Alexander Nesterov-Mueller

      Version of Record online: 4 MAR 2014 | DOI: 10.1002/adma.201305759

      Thumbnail image of graphical abstract

      Combinatorial laser fusing is a new method to produce high-density peptide arrays with feature sizes as small as 10 μm. It combines the high spot densities achieved by lithographic methods with the cost-efficiency of biofunctional xerography. The method is also adapted for other small molecules compatible with solid phase synthesis.

    17. Controlled Ambipolar Tuning and Electronic Superlattice Fabrication of Graphene via Optical Gating (pages 3735–3740)

      Ji Qi, Hui Zhang, Dandan Ji, Xiaodong Fan, Long Cheng, Haixing Liang, Hui Li, Changgan Zeng and Zhenyu Zhang

      Version of Record online: 20 MAR 2014 | DOI: 10.1002/adma.201400062

      Thumbnail image of graphical abstract

      A novel optical gating method is demonstrated to achieve controllable ambipolar tuning of graphene on diverse semiconductor substrates. Furthermore, electronic fabrication to form erasable electronic superlattices in structurally homogenous graphene is proposed based on selective optical gating. The created p-p+ superlattices exhibits counterintuitive transport properties, which can be attributed to nonlinear effects in the carrier dynamics around the interfaces.

    18. Facile Synthesis of Yolk–Shell Structured Inorganic–Organic Hybrid Spheres with Ordered Radial Mesochannels (pages 3741–3747)

      Zhaogang Teng, Shouju Wang, Xiaodan Su, Guotao Chen, Ying Liu, Zhimin Luo, Wei Luo, Yuxia Tang, Huangxian Ju, Dongyuan Zhao and Guangming Lu

      Version of Record online: 17 MAR 2014 | DOI: 10.1002/adma.201400136

      Thumbnail image of graphical abstract

      Monodisperse yolk–shell mesoporous hybrid spheres with ordered radial mesochannels are demonstrated to be readily prepared by incubating mesostructured hybrid spheres with water. The obtained yolk–shell mesoporous spheres have inorganic–organic hybrid framework, tunable diameter, high surface area, radially oriented ordered mesochannels, large pore volume, and excellent hemocompatibilitys, showing great promise for various applications.

    19. Additive Enhanced Crystallization of Solution-Processed Perovskite for Highly Efficient Planar-Heterojunction Solar Cells (pages 3748–3754)

      Po-Wei Liang, Chien-Yi Liao, Chu-Chen Chueh, Fan Zuo, Spencer T. Williams, Xu-Kai Xin, Jiangjen Lin and Alex K.-Y. Jen

      Version of Record online: 14 MAR 2014 | DOI: 10.1002/adma.201400231

      Thumbnail image of graphical abstract

      An effective method to control the rate of perovskite crystallization by incorporating rationally chosen additives into the perovskite precursor solutions is demonstrated. The processing additives simultaneously facilitate nucleation and modulate the kinetics of crystal growth during crystallization, leading to much smoother perovskite morphology with improved coverage area and crystal uniformity. As a result, it enables very high PCE (∼12%) planar-heterojunction solar cells to be fabricated through the low-temperature solution processes (under 150 °C). This study opens up a new direction for optimizing perovskite active layer properties to expand device performance ceilings.

    20. Monolithic III-V Nanowire Solar Cells on Graphene via Direct van der Waals Epitaxy (pages 3755–3760)

      Parsian K. Mohseni, Ashkan Behnam, Joshua D. Wood, Xiang Zhao, Ki Jun Yu, Ning C. Wang, Angus Rockett, John A. Rogers, Joseph W. Lyding, Eric Pop and Xiuling Li

      Version of Record online: 20 MAR 2014 | DOI: 10.1002/adma.201305909

      Thumbnail image of graphical abstract

      Novel solar cells, based on dense arrays of InGaAs nanowires, are grown directly on graphene. Here, graphene serves as the conductive back contact and growth template for van der Waals epitaxial assembly of vertical nanowires. Although far from being the optimum material, core-shell p–n junction In0.25Ga0.75As nanowire arrays demonstrate a conversion efficiency of 2.51%, representing a new record for substrate-free, III-V nanowire-based solar cells.

    21. Electrochemically Fabricated Polypyrrole and MoSx Copolymer Films as a Highly Active Hydrogen Evolution Electrocatalyst (pages 3761–3766)

      Tanyuan Wang, Junqiao Zhuo, Kuangzhou Du, Bingbo Chen, Zhiwei Zhu, Yuanhua Shao and Meixian Li

      Version of Record online: 17 MAR 2014 | DOI: 10.1002/adma.201400265

      Thumbnail image of graphical abstract

      Copolymer hybrid films consisting of polypyrrole/MoSx (x ≈ 5) with significantly enhanced electrocatalytic activity for the hydrogen evolution reaction (HER) are fabricated by a one-step electrochemical copolymerization of pyrrole and (NH4)2MoS4. The films show a Tafel slope of 29 mV dec−1 and an onset potential of 0 V vs. RHE, which is comparable to those of commercial Pt/C catalysts.

    22. High Performance All-Polymer Solar Cell via Polymer Side-Chain Engineering (pages 3767–3772)

      Yan Zhou, Tadanori Kurosawa, Wei Ma, Yikun Guo, Lei Fang, Koen Vandewal, Ying Diao, Chenggong Wang, Qifan Yan, Julia Reinspach, Jianguo Mei, Anthony Lucas Appleton, Ghada I. Koleilat, Yongli Gao, Stefan C. B. Mannsfeld, Alberto Salleo, Harald Ade, Dahui Zhao and Zhenan Bao

      Version of Record online: 24 MAR 2014 | DOI: 10.1002/adma.201306242

      Thumbnail image of graphical abstract

      An average PCE of 4.2% for all-polymer solar cells from 20 devices with an average J SC of 8.8 mA cm−2 are obtained with a donor-acceptor pair despite a low LUMO-LUMO energy offset of less than 0.1 eV. Incorporation of polystyrene side chains into the donor polymer is found to assist in reducing the phase separation domain length scale, and results in more than 20% enhancement of PCE. We observe a direct correlation between the short circuit current (J SC) and the length scale of BHJ phase separation, which is obtained by resonance soft X-ray scattering.

SEARCH

SEARCH BY CITATION