Advanced Materials

Cover image for Advanced Materials

May 7, 2014

Volume 26, Issue 17

Pages 2609–2761

  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. Communications
    10. Frontispiece
    11. Communications
    1. You have free access to this content
      Titanium Oxide Fibers: Original Electrospun Core–Shell Nanostructured Magnéli Titanium Oxide Fibers and their Electrical Properties (Adv. Mater. 17/2014) (page 2609)

      Vasana Maneeratana, David Portehault, Julien Chaste, Dominique Mailly, Markus Antonietti and Clément Sanchez

      Article first published online: 7 MAY 2014 | DOI: 10.1002/adma.201470109

      Thumbnail image of graphical abstract

      Combination of sol-gel chemistry and the electrospinning process leads to unprecedented versatility in the design of nanostructured Magnéli phases. D. Portehault and co-workers demonstrate on page 2654 that adjusting experimental levers, such as the temperature, provides an efficient route for tuning the composition, the crystal structure, the nano-and micro-structures, and the electrical behavior of functional titanium sub-oxide wires.

  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. Communications
    10. Frontispiece
    11. Communications
    1. You have free access to this content
      Sensors: Flexible Three-Axial Force Sensor for Soft and Highly Sensitive Artificial Touch (Adv. Mater. 17/2014) (page 2610)

      Lucie Viry, Alessandro Levi, Massimo Totaro, Alessio Mondini, Virgilio Mattoli, Barbara Mazzolai and Lucia Beccai

      Article first published online: 7 MAY 2014 | DOI: 10.1002/adma.201470110

      Thumbnail image of graphical abstract

      Mimicking a natural touch requires not only softness, flexibility, compliance, but also robustness and high sensitivity to mechanical stimuli in the 3D space over a wide force range; this is a complex synergy to consider for the fabrication of performing tactile sensors. L. Beccai and co-workers propose on page 2659 an original and lowcost approach, which can inspire novel designs for artificial skins.

  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. Communications
    10. Frontispiece
    11. Communications
    1. You have free access to this content
      Semiconductors: Growth of Large-Area 2D MoS2(1-x)Se2x Semiconductor Alloys (Adv. Mater. 17/2014) (page 2763)

      Qingliang Feng, Yiming Zhu, Jinhua Hong, Mei Zhang, Wenjie Duan, Nannan Mao, Juanxia Wu, Hua Xu, Fengliang Dong, Fang Lin, Chuanhong Jin, Chunming Wang, Jin Zhang and Liming Xie

      Article first published online: 7 MAY 2014 | DOI: 10.1002/adma.201470114

      Thumbnail image of graphical abstract

      Alloying in monolayers enables bandgap tuning in twodimensions. On page 2648, L. Xie, J. Zhang, and co-workers demonstrate that by direct evaporation of two end materials (MoS2 and MoSe2) and deposition at low temperatures, large-area 2D MoS2(1−x)Se2x monolayers are obtained. By changing the S/Se composition, the bandgap of MoS2(1−x)Se2x monolayers can be continuously tuned.

  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. Communications
    10. Frontispiece
    11. Communications
    1. You have free access to this content
      Microchannels: In Situ Realization of Asymmetric Ratchet Structures within Microchannels by Directionally Guided Light Transmission and Their Directional Flow Behavior (Adv. Mater. 17/2014) (page 2764)

      Won-Gyu Bae, Sang Moon Kim, Se-Jin Choi, Sang Geun Oh, Hyunsik Yoon, Kookheon Char and Kahp Y. Suh

      Article first published online: 7 MAY 2014 | DOI: 10.1002/adma.201470115

      Thumbnail image of graphical abstract

      On page 2665, K. Char, H. Yoon, and co-workers present a direct and facile method to realize programmed asymmetric structures within microchannels. A photo-polymerization with the directional transmission through an optically asymmetric film is exploited to fabricate asymmetric ratchets. Two examples to control the fluid speed, as well as the rate-dependent channel filling, showing different dwell times in a split channel, are demonstrated.

  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. Communications
    10. Frontispiece
    11. Communications
    1. Masthead: (Adv. Mater. 17/2014)

      Article first published online: 7 MAY 2014 | DOI: 10.1002/adma.201470112

  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. Communications
    10. Frontispiece
    11. Communications
  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. Communications
    10. Frontispiece
    11. Communications
    1. CdS Nanoscale Photodetectors (pages 2619–2635)

      Kaimo Deng and Liang Li

      Article first published online: 14 MAR 2014 | DOI: 10.1002/adma.201304621

      Thumbnail image of graphical abstract

      Recent advances of CdS nanoscale photodetectors with Ohmic contact, Schottky contact and MESFET configuration are summarized. Element doping, composition and bandgap engineering, heterojunction integration, and new design concepts in photodetectors are discussed. Future development directions are also discussed.

  8. 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. Communications
    10. Frontispiece
    11. Communications
    1. Record High Electron Mobility of 6.3 cm2V−1s−1 Achieved for Polymer Semiconductors Using a New Building Block (pages 2636–2642)

      Bin Sun, Wei Hong, Zhuangqing Yan, Hany Aziz and Yuning Li

      Article first published online: 13 MAR 2014 | DOI: 10.1002/adma.201305981

      Thumbnail image of graphical abstract

      A new electron acceptor building block, 3,6-di(pyridin-2-yl)pyrrolo[3,4-c ]pyrrole-1,4(2H ,5H)-dione (DBPy), is used to construct a donor-acceptor polymer, PDBPyBT. This polymer exhibits a strong self-assembly capability, to form highly crystalline and oriented thin films with a short π–π stacking distance of 0.36 nm. PDBPyBT shows ambipolar charge-transport performance in organic thin-film transistors, reaching a record high electron-mobility value of 6.30 cm2 V−1 s−1.

    2. Stretchable, Wearable Dye-Sensitized Solar Cells (pages 2643–2647)

      Zhibin Yang, Jue Deng, Xuemei Sun, Houpu Li and Huisheng Peng

      Article first published online: 20 MAR 2014 | DOI: 10.1002/adma.201400152

      Thumbnail image of graphical abstract

      A stretchable, wearable dye-sensitized solar-cell textile is developed from elastic, electrically conducting fiber as a counter electrode and spring-like titanium wire as the working electrode. Dyesensitized solar cells are demonstrated with energy-conversion efficiencies up to 7.13%. The high energy-conversion efficiencies can be well maintained under stretch by 30% and after stretch for 20 cycles.

    3. Growth of Large-Area 2D MoS2(1-x)Se2x Semiconductor Alloys (pages 2648–2653)

      Qingliang Feng, Yiming Zhu, Jinhua Hong, Mei Zhang, Wenjie Duan, Nannan Mao, Juanxia Wu, Hua Xu, Fengliang Dong, Fang Lin, Chuanhong Jin, Chunming Wang, Jin Zhang and Liming Xie

      Article first published online: 20 FEB 2014 | DOI: 10.1002/adma.201306095

      Thumbnail image of graphical abstract

      Semiconducting MoS2(1-x)Se2x mono­layers where x = 0–0.40 are successfully grown over large areas. A random arrangement of the S and Se atoms and a tunable bandgap photoluminescence are observed. Atomically thin, 2D semiconductor alloys with tunable bandgaps have potential applications in nano- and opto-electronics. Field-effect transistors fabricated with the monolayers exhibit high on/off ratios of >105.

    4. Original Electrospun Core–Shell Nanostructured Magnéli Titanium Oxide Fibers and their Electrical Properties (pages 2654–2658)

      Vasana Maneeratana, David Portehault, Julien Chaste, Dominique Mailly, Markus Antonietti and Clément Sanchez

      Article first published online: 21 FEB 2014 | DOI: 10.1002/adma.201305148

      Thumbnail image of graphical abstract

      A combination of sol-gel chemistry and the electrospinning process leads to unprecedented versatility in the design of nano-Magnéli phases. Adjusting experimental levers provides an efficient route for tuning the composition, the crystal structure, and the nano- and microstructure of titanium sub-oxides, thus paving the way to functional membranes and tissues.

    5. You have full text access to this OnlineOpen article
      Flexible Three-Axial Force Sensor for Soft and Highly Sensitive Artificial Touch (pages 2659–2664)

      Lucie Viry, Alessandro Levi, Massimo Totaro, Alessio Mondini, Virgilio Mattoli, Barbara Mazzolai and Lucia Beccai

      Article first published online: 20 FEB 2014 | DOI: 10.1002/adma.201305064

      Thumbnail image of graphical abstract

      A soft tactile sensor able to detect both normal and tangential forces is fabricated with a simple method using conductive textile. Owing to the multi-layered architecture, the capacitive-based tactile sensor is highly sensitive (less than 10 mg and 8 μm, for minimal detectable weight and displacement, respectively) within a wide normal force range (potentially up to 27 N (400 kPa)) and natural touch-like tangential force ranges (from about 0.5 N to 1.8 N). Being flexible, soft, and low cost, this sensor represents an original approach in the emulation of natural touch.

    6. In Situ Realization of Asymmetric Ratchet Structures within Microchannels by Directionally Guided Light Transmission and Their Directional Flow Behavior (pages 2665–2670)

      Won-Gyu Bae, Sang Moon Kim, Se-Jin Choi, Sang Geun Oh, Hyunsik Yoon, Kookheon Char and Kahp Y. Suh

      Article first published online: 14 MAR 2014 | DOI: 10.1002/adma.201305001

      Thumbnail image of graphical abstract

      An asymmetric ratchet structure within microchannels is demonstrated by directionally guided light transmission for controlled liquid flow. A direct and facile method is presented to realize programmed asymmetric structures, which control the fluid direction and speed.

    7. You have full text access to this OnlineOpen article
      Taming the First-Order Transition in Giant Magnetocaloric Materials (pages 2671–2675)

      François Guillou, Giacomo Porcari, Hargen Yibole, Niels van Dijk and Ekkes Brück

      Article first published online: 22 FEB 2014 | DOI: 10.1002/adma.201304788

      Thumbnail image of graphical abstract

      Large magnetically driven temperature changes are observed in MnFe(P,Si,B) materials simultaneously with large entropy changes, limited (thermal or magnetic) hysteresis, and good mechanical stability. The partial substitution of B for P in MnFe(P,Si) compounds is found to be an ideal parameter to control the latent heat observed at the Curie point without deteriorating the magnetic properties, which results in promising magnetocaloric properties suitable for magnetic refrigeration.

    8. Solid-State Supercapacitor Based on Activated Carbon Cloths Exhibits Excellent Rate Capability (pages 2676–2682)

      Gongming Wang, Hanyu Wang, Xihong Lu, Yichuan Ling, Minghao Yu, Teng Zhai, Yexiang Tong and Yat Li

      Article first published online: 4 FEB 2014 | DOI: 10.1002/adma.201304756

      Thumbnail image of graphical abstract

      Activated carbon cloth is used as an electrode, achieving an excellent areal capacitance of 88 mF/cm2 (8.8 mF/g) without the use of any other capacitive materials. Significantly, when it is incorporated as part of a symmetric solid-state supercapacitor device, a remarkable charge/discharge rate capability is observed; 50% of the capacitance is retained when the charging rate increases from 10 to 10 000 mV/s.

    9. Ultrahigh Hydrogen Evolution Performance of Under-Water “Superaerophobic” MoS2 Nanostructured Electrodes (pages 2683–2687)

      Zhiyi Lu, Wei Zhu, Xiaoyou Yu, Haichuan Zhang, Yingjie Li, Xiaoming Sun, Xinwei Wang, Hao Wang, Jingming Wang, Jun Luo, Xiaodong Lei and Lei Jiang

      Article first published online: 1 FEB 2014 | DOI: 10.1002/adma.201304759

      Thumbnail image of graphical abstract

      The adhesion of as-formed gas bubbles on the electrode surface usually impedes mass-transfer kinetics and subsequently decreases electrolysis efficiency. Here it is demonstrated that nanostructured MoS2 films on conductive substrates show a faster hydrogen evolution reaction (HER), current increase, and a more-stable working state than their flat counterpart by significantly alleviating the adhesion of as-formed gas bubbles on the electrode. This study clearly reveals the importance of a nano-porous structure for HER, which should be general and beneficial for constructing other gas-evolution electrodes.

    10. A Universal Approach to Crosslinked Hierarchical Polymer Multilayers as Stable and Highly Effective Antifouling Coatings (pages 2688–2693)

      Qiang Wei, Tobias Becherer, Paul-Ludwig Michael Noeske, Ingo Grunwald and Rainer Haag

      Article first published online: 20 MAR 2014 | DOI: 10.1002/adma.201304737

      Thumbnail image of graphical abstract

      Material-independent and bioinert hierarchical polymer multilayer coatings are presented. Chemically active catecholic hyperbranched polyglycerols (hPGs) form a foundation layer on a versatile surface via multivalent anchoring and crosslinking, the activity of which is shielded by the bioinert catecholic hPGs. Mono-catecholic hPGs finally terminate all of the free catechols to build a flexible bioinert top layer. These coatings perfectly prevent protein and cell adhesion.

    11. Anchoring Group Effects of Surface Ligands on Magnetic Properties of Fe3O4 Nanoparticles: Towards High Performance MRI Contrast Agents (pages 2694–2698)

      Jianfeng Zeng, Lihong Jing, Yi Hou, Mingxia Jiao, Ruirui Qiao, Qiaojuan Jia, Chunyan Liu, Fang Fang, Hao Lei and Mingyuan Gao

      Article first published online: 24 FEB 2014 | DOI: 10.1002/adma.201304744

      Thumbnail image of graphical abstract

      The effect of the anchoring group of surface ligands on the magnetic properties, especially relaxometric properties, of PEGylated Fe3O4 nanoparticles is investigated. Systematic experimental results together with in-depth theoretical analysis reveal that the ligand binding affinity can largely vary the saturation magnetization, whereas conjugated anchoring groups can remarkably enhance the transverse relaxivity, which highlights a novel approach for achieving high-performance MRI contrast agents.

    12. In Situ Third-Order Non-linear Responses During Laser Reduction of Graphene Oxide Thin Films Towards On-Chip Non-linear Photonic Devices (pages 2699–2703)

      Xiaorui Zheng, Baohua Jia, Xi Chen and Min Gu

      Article first published online: 17 MAR 2014 | DOI: 10.1002/adma.201304681

      Thumbnail image of graphical abstract

      High-quality continuous (GO) thin films are prepared by a self-assembly method. Z-scan measurements during the laser-induced reduction process unveil in situ nonlinear responses in the GO film. Third-order nonlinear responses of the GO film can be tuned dynamically by varying the laser input fluence. GO thin films with tunable nonlinear responses and versatile patterning opportunities by using direct laser writing may serve as promising solid-state materials for novel nonlinear functional devices.

    13. You have full text access to this OnlineOpen article
      Reversible Non-Stick Behaviour of a Bacterial Protein Polymer Provides a Tuneable Molecular Mimic for Cell and Tissue Engineering (pages 2704–2709)

      Ana I. Roque, Andrei Soliakov, Mark A. Birch, Sion R. Philips, Deepan S. H. Shah and Jeremy H. Lakey

      Article first published online: 13 MAR 2014 | DOI: 10.1002/adma.201304645

      Thumbnail image of graphical abstract

      Yersina pestis, the bubonic plague bacterium, is coated with a polymeric protein hydrogel for protection from host defences. The protein, which is robust and non-stick, resembles structures found in many eukaryotic extracellular-matrix proteins. Cells grown on the natural polymer cannot adhere and grow poorly; however, when cell-adhesion motifs are inserted into the protein, the cells proliferate.

    14. Self-Assembled Quantum Dot Structures in a Hexagonal Nanowire for Quantum Photonics (pages 2710–2717)

      Ying Yu, Xiu-Ming Dou, Bin Wei, Guo-Wei Zha, Xiang-Jun Shang, Li Wang, Dan Su, Jian-Xing Xu, Hai-Yan Wang, Hai-Qiao Ni, Bao-Quan Sun, Yuan Ji, Xiao-Dong Han and Zhi-Chuan Niu

      Article first published online: 14 FEB 2014 | DOI: 10.1002/adma.201304501

      Thumbnail image of graphical abstract

      Two types of quantum nanostructures based on self-assembled GaAs quantumdots embedded into GaAs/AlGaAs hexagonal nanowire systems are reported, opening a new avenue to the fabrication of highly efficient single-photon sources, as well as the design of novel quantum optics experiments and robust quantum optoelectronic devices operating at higher temperature, which are required for practical quantum photonics applications.

    15. Physically Flexible, Rapid-Response Gas Sensor Based on Colloidal Quantum Dot Solids (pages 2718–2724)

      Huan Liu, Min Li, Oleksandr Voznyy, Long Hu, Qiuyun Fu, Dongxiang Zhou, Zhe Xia, Edward H. Sargent and Jiang Tang

      Article first published online: 22 JAN 2014 | DOI: 10.1002/adma.201304366

      Thumbnail image of graphical abstract

      A gas sensor based on PbS colloidal quantum dots (CQDs) is constructed on a paper substrate, yielding flexible, rapid-response NO2 gas sensors, fabricated from the solution phase. The devices are highly sensitive and fully recoverable at room temperature, which is attributed to the excellent access of gas molecules to the CQD surface, realized by surface ligand removal, combined with the desirable binding energy of NO2 with the PbS CQDs.

    16. Ordered Supramolecular Gels Based on Graphene Oxide and Tetracationic Cyclophanes (pages 2725–2729)

      Sampath Srinivasan, Sang Hyun Je, Seoin Back, Gokhan Barin, Onur Buyukcakir, Ruslan Guliyev, Yousung Jung and Ali Coskun

      Article first published online: 12 FEB 2014 | DOI: 10.1002/adma.201304334

      Thumbnail image of graphical abstract

      A new strategy to form ordered hierarchical supramolecular gels that incorporate graphene oxide (GO) sheets and cationic rigid macrocyles under mild conditions via self-assembly is demonstrated. These ordered gels are stabilized by a series of non-covalent – donor-acceptor, π–π stacking, cation-π – interactions. These theoretical studies indicate that cationic macrocycles are positioned in between GO layers with a substantial binding energy.

    17. Spectroscopic Proof of the Correlation between Redox-State and Charge-Carrier Transport at the Interface of Resistively Switching Ti/PCMO Devices (pages 2730–2735)

      Anja Herpers, Christian Lenser, Chanwoo Park, Francesco Offi, Francesco Borgatti, Giancarlo Panaccione, Stephan Menzel, Rainer Waser and Regina Dittmann

      Article first published online: 6 APR 2014 | DOI: 10.1002/adma.201304054

      Thumbnail image of graphical abstract

      By using hard X-ray photoelectron spectroscopy experimentally, proof is provided that resistive switching in Ti/Pr0.48Ca0.52MnO3 (PCMO) devices is based on a redox-process that mainly occurs on the Ti-side. The different resistance states are determined by the amount of fully oxidized Ti-ions in the stack, implying a reversible redox-reaction at the interface, which governs the formation and shortening of an insulating tunnel barrier.

  9. 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. Communications
    10. Frontispiece
    11. Communications
    1. You have free access to this content
      Optical Absorbers: Nanocavity Enhancement for Ultra-Thin Film Optical Absorber (Adv. Mater. 17/2014) (page 2736)

      Haomin Song, Luqing Guo, Zhejun Liu, Kai Liu, Xie Zeng, Dengxin Ji, Nan Zhang, Haifeng Hu, Suhua Jiang and Qiaoqiang Gan

      Article first published online: 7 MAY 2014 | DOI: 10.1002/adma.201470113

      Thumbnail image of graphical abstract

      On page 2737, Q. Gan, S. Jiang, and co-workers develop a fundamental strategy to enhance the light-matter interaction of ultra-thin (i.e., 1.5–3 nm) Ge films based on a strong interference effect in planar nanocavities, and overcome the limitation between the optical absorption and film thickness of energy-harvesting/conversion materials. This principle is quite general and can be applied to explore the spectrally tunable absorption enhancement of various ultra-thin absorbing materials.

  10. 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. Communications
    10. Frontispiece
    11. Communications
    1. Nanocavity Enhancement for Ultra-Thin Film Optical Absorber (pages 2737–2743)

      Haomin Song, Luqing Guo, Zhejun Liu, Kai Liu, Xie Zeng, Dengxin Ji, Nan Zhang, Haifeng Hu, Suhua Jiang and Qiaoqiang Gan

      Article first published online: 24 FEB 2014 | DOI: 10.1002/adma.201305793

      Thumbnail image of graphical abstract

      A fundamental strategy is developed to enhance the light-matter interaction of ultra-thin films based on a strong interference effect in planar nanocavities, and overcome the limitation between the optical absorption and film thickness of energy harvesting/conversion materials. This principle is quite general and is applied to explore the spectrally tunable absorption enhancement of various ultra-thin absorptive materials including 2D atomic monolayers.

    2. Molecular Design and Morphology Control Towards Efficient Polymer Solar Cells Processed using Non-aromatic and Non-chlorinated Solvents (pages 2744–2749)

      Yu Chen, Shaoqing Zhang, Yue Wu and Jianhui Hou

      Article first published online: 4 FEB 2014 | DOI: 10.1002/adma.201304825

      Thumbnail image of graphical abstract

      Using an environmentally friendly solvent, N-methyl-2-pyrrolidone, a polymer with benzodithiophene (BDT) and thieno[3,4-b]thiophene (TT) monomers and triethylene glycol monoether (TEG) side chains, PBDTTT-TEG, can be processed into an active layer for a polymer solar cell (PSC). Combined with phenyl-C 71-butyric acid methyl ester (PC 71 BM) as the acceptor, the resulting PSC has a power conversion efficiency (PCE) of 5.23%. This is the first example of an efficient polymer solar cell fabricated from a non-aromatic and nonchlorinated solvent.

    3. Enhanced Electron Injection into Inverted Polymer Light-Emitting Diodes by Combined Solution-Processed Zinc Oxide/Polyethylenimine Interlayers (pages 2750–2754)

      Stefan Höfle, Alexander Schienle, Michael Bruns, Uli Lemmer and Alexander Colsmann

      Article first published online: 31 MAR 2014 | DOI: 10.1002/adma.201304666

      Thumbnail image of graphical abstract

      Inverted device architectures for organic light-emitting diodes (OLEDs) require suitable interfaces or buffer layers to enhance electron injection from highwork-function transparent electrodes. A solution-processable combination of ZnO and PEI is reported, that facilitates electron injection and enables efficient and air-stable inverted devices. Replacing the metal anode by highly conductive polymers enables transparent OLEDs.

    4. Hot Carrier Filtering in Solution Processed Heterostructures: A Paradigm for Improving Thermoelectric Efficiency (pages 2755–2761)

      Yichi Zhang, Je-Hyeong Bahk, Joun Lee, Christina S. Birkel, Matthew L. Snedaker, Deyu Liu, Hongmei Zeng, Martin Moskovits, Ali Shakouri and Galen D. Stucky

      Article first published online: 28 JAN 2014 | DOI: 10.1002/adma.201304419

      Thumbnail image of graphical abstract

      An approach based on a solution-based synthesis that produces a thermally stable Ag/oxide/Sb2Te3-Te metal-semiconductor heterostructure is described. With this approach, a figure of merit of zT = 1.0 at 460 K is achieved, a record for a heterostructured material made using wet chemistry. Combining experiments and theory shows that the large increase in the material's Seebeck coefficient results from hot carrier filtering.

SEARCH

SEARCH BY CITATION