Advanced Energy Materials

Cover image for Vol. 4 Issue 2

January 28, 2014

Volume 4, Issue 2

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Correction
    7. Progress Reports
    8. Communications
    9. Full Papers
    1. You have free access to this content
      Solar Cells: Electrical Performance of Organic Solar Cells with Additive-Assisted Vertical Phase Separation in the Photoactive Layer (Adv. Energy Mater. 2/2014)

      Min Kim, Joo-Hyun Kim, Hyun Ho Choi, Jong Hwan Park, Sae Byeok Jo, Myungsun Sim, Jong Soo Kim, Hiroshi Jinnai, Yeong Don Park and Kilwon Cho

      Article first published online: 25 JAN 2014 | DOI: 10.1002/aenm.201470007

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      The three-dimensional characterization of the bulk heterojunction photoactive layer is essential for the systematic optimization of film morphologies in the development of highly efficient organic photovoltaic (OPV) devices. In article 1300612, Kilwon Cho and co-workers report on the additiveassisted vertical phase separation of the photoactive layer in organic solar cells, which is strongly correlated with the asymmetric electrical behavior and photovoltaic parameters.

  2. Inside Front Cover

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Correction
    7. Progress Reports
    8. Communications
    9. Full Papers
    1. You have free access to this content
      Thin Films: Mapping Spatially Resolved Charge Collection Probability within P3HT:PCBM Bulk Heterojunction Photovoltaics (Adv. Energy Mater. 2/2014)

      D. M. Nanditha M. Dissanayake, Ahsan Ashraf, Yutong Pang and Matthew D. Eisaman

      Article first published online: 25 JAN 2014 | DOI: 10.1002/aenm.201470008

      Thumbnail image of graphical abstract

      In article 1300525, D. M. Nanditha M. Dissanayake and co-workers show that unlike the behavior observed thicknesses typically used for devices (100 nm), electron-limited behavior is seen for a thicker active layer (920 nm) due to phase segregation in poly(3-hexythiophene-2,5-diyl):phenyl-C61-butyric acid methyl ester (P3HT:PCBM). The illustration shows prism-coupled guidedmodes used for spatially selective excitation in a P3HT:PCBM photovoltaic, which are used to obtain high-resolution profiles of charge-collection probability in the photoactive layer.

  3. Masthead

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Correction
    7. Progress Reports
    8. Communications
    9. Full Papers
    1. Masthead: (Adv. Energy Mater. 2/2014)

      Article first published online: 25 JAN 2014 | DOI: 10.1002/aenm.201470010

  4. Contents

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Correction
    7. Progress Reports
    8. Communications
    9. Full Papers
    1. Contents: (Adv. Energy Mater. 2/2014)

      Article first published online: 25 JAN 2014 | DOI: 10.1002/aenm.201470009

  5. Correction

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Correction
    7. Progress Reports
    8. Communications
    9. Full Papers
  6. Progress Reports

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Correction
    7. Progress Reports
    8. Communications
    9. Full Papers
    1. Considerations in the Design of Materials for Solar-Driven Fuel Production Using Metal-Oxide Thermochemical Cycles

      James E. Miller, Anthony H. McDaniel and Mark D. Allendorf

      Article first published online: 8 OCT 2013 | DOI: 10.1002/aenm.201300469

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      Increasing demand for energy and anthropogenic climate change make carbon-neutral fuels an imperative. Transportation infrastructure based on liquid fuels motivates the development of solar-driven processes to convert CO2 and H2O to fuel precursors. This perspective concerns the use of solar-driven thermochemical cycles based on metal oxides to produce fuel precursors and the synergistic relationship between reactor design and material selection.

  7. Communications

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Correction
    7. Progress Reports
    8. Communications
    9. Full Papers
    1. Nanoporous Polymer-Ceramic Composite Electrolytes for Lithium Metal Batteries

      Zhengyuan Tu, Yu Kambe, Yingying Lu and Lynden A. Archer

      Article first published online: 16 SEP 2013 | DOI: 10.1002/aenm.201300654

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      A nanoporous composite material that offers the unique combination of high room-temperature ionic conductivity and high mechanical modulus is reported. When used as the separator/electrolyte in lithium batteries employing metallic lithium as anode, the material displays unprecedented cycling stability and excellent ability to prevent premature cell failure by dendrite-induced short circuits

    2. Cu-Rich Precursors Improve Kesterite Solar Cells

      Marina Mousel, Torsten Schwarz, Rabie Djemour, Thomas P. Weiss, Jan Sendler, João C. Malaquias, Alex Redinger, Oana Cojocaru-Mirédin, Pyuck-Pa Choi and Susanne Siebentritt

      Article first published online: 19 SEP 2013 | DOI: 10.1002/aenm.201300543

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      A precursor-annealing process based on a Cu-rich precursor that has a maximum power conversion efficiency of 7.5% for pure selenide kesterite cells is presented. The Cu-rich step is beneficial for the transport properties. Nanometer-sized domains of ZnSe are found in all films.

    3. Heterojunction with Organic Thin Layers on Silicon for Record Efficiency Hybrid Solar Cells

      Yunfang Zhang, Fengshuo Zu, Shuit-Tong Lee, Liangsheng Liao, Ni Zhao and Baoquan Sun

      Article first published online: 16 SEP 2013 | DOI: 10.1002/aenm.201300923

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      A record power conversion efficiency of 12.2% is achieved for a hybrid organic-inorganic Schottky solar cell using a simple and low temperature (<150 °C) process. The heterojunction diode based on a simple integration of organic thin layers and silicon promises a low cost way to fabricate high performance solar cells.

    4. Printed Piezoelectric Energy Harvesting Device

      Moazzam Ali, Deep Prakash, Tino Zillger, Pradeep Kumar Singh and Arved Carl Hübler

      Article first published online: 5 SEP 2013 | DOI: 10.1002/aenm.201300427

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      A Printed piezoelectric energy harvesting device is prepared using a flexographic printing process. The device includes two parts: a lead zirconate titanate based kinetic-to-electrical energy converter and a printed bridge rectifier based on four ZnO/poly(3-hexylthiophene-2,5-diyl) (P3HT) diodes.

    5. Enhancement of the Thermoelectric Performance of Polycrystalline In4Se2.5 by Copper Intercalation and Bromine Substitution

      Yubo Luo, Junyou Yang, Gen Li, Ming Liu, Ye Xiao, Liangwei Fu, Weixin Li, Pinwen Zhu, Jiangying Peng, Sheng Gao and Jiaqi Zhang

      Article first published online: 6 SEP 2013 | DOI: 10.1002/aenm.201300599

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      An effective approach to enhance the thermoelectric performance (ZT) of polycrystalline In4Se3 based samples by crystallographic and microstructural engineering is proposed and demonstrated. Cu intercalation, Br substitution at selenium sites, and incorporation of dispersed hierarchical nanoparticles are discussed. An improved ZT of 1.1 at 723 K is achieved in CuBr2 doped In4Se2.5.

    6. Graphite Intercalation Compounds (GICs): A New Type of Promising Anode Material for Lithium-Ion Batteries

      Fei Wang, Jin Yi, Yonggang Wang, Congxiao Wang, Jianqiang Wang and Yongyao Xia

      Article first published online: 9 SEP 2013 | DOI: 10.1002/aenm.201300600

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      Graphite intercalation compounds (GICs) for the first time are used as the anode material for lithium-ion batteries. They exhibit high reversible capacity with excellent cycle life.

  8. Full Papers

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Correction
    7. Progress Reports
    8. Communications
    9. Full Papers
    1. Solvent-Polarity-Induced Active Layer Morphology Control in Crystalline Diketopyrrolopyrrole-Based Low Band Gap Polymer Photovoltaics

      Sunzida Ferdous, Feng Liu, Dong Wang and Thomas P. Russell

      Article first published online: 16 SEP 2013 | DOI: 10.1002/aenm.201300834

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      Mixed solvent systems of various polarities significantly change the behavior of phase separation process between the diketopyrrolopyrrole (DPP)-based low band gap polymer (PDPPBT) and phenyl-C71-butyric acid methyl ester (PC71BM). Unfavorable interactions between PC71BM and non-polar secondary solvents cause significant reduction in power conversion efficiencies, while reduced interfibrillar distances in blend films cast from polar and low vapor pressure secondary solvents give substantial enhancement in device performance.

    2. Hierarchical Carbide-Derived Carbon Foams with Advanced Mesostructure as a Versatile Electrochemical Energy-Storage Material

      Martin Oschatz, Lars Borchardt, Katja Pinkert, Sören Thieme, Martin R. Lohe, Claudia Hoffmann, Matthias Benusch, Florian M. Wisser, Christoph Ziegler, Lars Giebeler, Mark H. Rümmeli, Jürgen Eckert, Alexander Eychmüller and Stefan Kaskel

      Article first published online: 4 SEP 2013 | DOI: 10.1002/aenm.201300645

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      Hierarchical carbide-derived carbon (CDC) mesofoams (DUT-70) with extremely high specific surface areas and nanopore volumes are presented. DUT-70 shows outstanding specific capacities as electrode materials in electrochemical double-layer capacitors and as sulfur host in lithium–sulfur battery cathodes. This CDC is an advanced material for electrochemical energy storage, combining high capacities with efficient mass-transfer behavior.

    3. ITO-Free, Small-Molecule Organic Solar Cells on Spray-Coated Copper-Nanowire-Based Transparent Electrodes

      Christoph Sachse, Nelli Weiß, Nikolai Gaponik, Lars Müller-Meskamp, Alexander Eychmüller and Karl Leo

      Article first published online: 11 SEP 2013 | DOI: 10.1002/aenm.201300737

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      Copper nanowires with high aspect ratios are synthesized and used as transparent electrodes. After different post-treatment steps that address the insulating nanowire shells, the spray-coated networks reveal a performance similar to indium tin oxide (ITO). The conductive networks show a reasonable stability and are integrated into a small-molecule organic solar cell.

    4. Electrical Performance of Organic Solar Cells with Additive-Assisted Vertical Phase Separation in the Photoactive Layer

      Min Kim, Joo-Hyun Kim, Hyun Ho Choi, Jong Hwan Park, Sae Byeok Jo, Myungsun Sim, Jong Soo Kim, Hiroshi Jinnai, Yeong Don Park and Kilwon Cho

      Article first published online: 1 OCT 2013 | DOI: 10.1002/aenm.201300612

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      Vertical phase-separated morphology and device architecture of organic solar cells critically affect the electrical performance. Solvent additive plays a significant role on vertical phase distribution and polymer crystallization, which are related to charge transport at the interface between the active layer and electrodes

    5. Scaling Up ITO-Free Solar Cells

      Yulia Galagan, Erica W. C. Coenen, Birger Zimmermann, Lenneke H. Slooff, Wiljan J. H. Verhees, Sjoerd C. Veenstra, Jan M. Kroon, Mikkel Jørgensen, Frederik C. Krebs and Ronn Andriessen

      Article first published online: 3 SEP 2013 | DOI: 10.1002/aenm.201300498

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      The up-scaling of indium-tin-oxide-free (ITO-free) solar cells from 1 to 6 cm in length and the effect of grid line resistance are explored for a series of devices. Theoretical modeling enables the identification of the most rational cell dimensions and illustrates the electric potential field in the devices. Performance of the ITO-free organic solar cells with different dimensions and different electrode resistances are evaluated for different light intensities.

    6. Fine-Grained and Nanostructured AgPbmSbTem+2 Alloys with High Thermoelectric Figure of Merit at Medium Temperature

      Zong-Yue Li and Jing-Feng Li

      Article first published online: 16 SEP 2013 | DOI: 10.1002/aenm.201300937

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      A high thermoelectric figure of merit (ZT) of up to 1.54 at a relatively low temperature (723 K) is obtained in n-type AgPbmSbTem+2 system bulk materials fabricated by a simple process. Simultaneous enhancement of electrical conductivity and thermopower is achieved by optimizing mesostructures and tuning carrier density via controlling Pb compositions

    7. Mapping Spatially Resolved Charge Collection Probability within P3HT:PCBM Bulk Heterojunction Photovoltaics

      D. M. Nanditha M. Dissanayake, Ahsan Ashraf, Yutong Pang and Matthew D. Eisaman

      Article first published online: 25 AUG 2013 | DOI: 10.1002/aenm.201300525

      Thumbnail image of graphical abstract

      Normally incident and wave-guided optical modes are used for selective excitation within an inverted bulk heterojunction organic photovoltaic to study the spatial profile of charge collection probability in the active layer. An electron-limited charge collection is observed for a thicker layer as a result of phase segregation while the thinner layer is governed only by the relative mobilities of the material.

    8. Two Channels of Charge Generation in Perylene Monoimide Solid-State Dye-Sensitized Solar Cells

      Ian A. Howard, Michael Meister, Björn Baumeier, Henrike Wonneberger, Neil Pschirer, Rüdiger Sens, Ingmar Bruder, Chen Li, Klaus Müllen, Denis Andrienko and Frédéric Laquai

      Article first published online: 21 AUG 2013 | DOI: 10.1002/aenm.201300640

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      Broadband ultrafast spectroscopy shows that electron injection into TiO2 from a red absorbing organic dye can be enhanced by a process in which a hole is transferred to the hole transport material to allow injection from the anion state of the dye. Quantitative analysis suggests this mechanism accounts for ≈10% of the charges generated and could be further enhanced. The reductive quenching mechanism of charge generation contributes to photocurrent generation.

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