Advanced Energy Materials

Cover image for Vol. 2 Issue 12

December, 2012

Volume 2, Issue 12

Pages 1413–1518

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Communications
    7. Full Papers
    1. Organic Photovoltaic Devices: Synergistic Effect of Processing Additives and Optical Spacers in Bulk-Heterojunction Solar Cells (Adv. Energy Mater. 12/2012) (page 1413)

      Sooncheol Kwon, Jin Kuen Park, Geunjin Kim, Jaemin Kong, Guillermo C. Bazan and Kwanghee Lee

      Article first published online: 5 DEC 2012 | DOI: 10.1002/aenm.201290057

      Thumbnail image of graphical abstract

      The front cover illustrates polymer solar cells fabricated using the processing additive (PA) technique and a TiOx optical spacer. While the polymer solar cell without the PA technique has rough surface morphology, resulting in a diffused reflection, the polymer solar cells with the PA technique show smooth surface morphology and thereby exhibit constructive interference of the reflected light. The synergistic effect of the PA technique and the optical spacer leads to increased power conversion efficiency and device lifetime, as reported by Kwanghee Lee, Guillermo C. Bazan, and co-workers on page 1420.

  2. Inside Front Cover

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Communications
    7. Full Papers
    1. Hydrogen Purification: UV-Rearranged PIM-1 Polymeric Membranes for Advanced Hydrogen Purification and Production (Adv. Energy Mater. 12/2012) (page 1414)

      Fu Yun Li, Youchang Xiao, Yee Kang Ong and Tai-Shung Chung

      Article first published online: 5 DEC 2012 | DOI: 10.1002/aenm.201290058

      Thumbnail image of graphical abstract

      On page 1456, Tai-Shung Chung and co-workers show, for the first time, that ultraviolet (UV)-rearranged polymers of PIM-1 membranes can be used for H2/CO2 separation with far superior separation performance to others in the literature. It is observed that the original contorted PIM-1 could be transformed to a close-to-planar like rearranged structure after UV radiation. Such membranes could have a H2 permeability of 452 barrer and a H2/CO2 selectivity of 7.3, which are far superior to recent state-of-the-art values for the separation of H2/CO2.

  3. Masthead

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Communications
    7. Full Papers
    1. Masthead: (Adv. Energy Mater. 12/2012)

      Article first published online: 5 DEC 2012 | DOI: 10.1002/aenm.201290059

  4. Contents

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Communications
    7. Full Papers
    1. Contents: (Adv. Energy Mater. 12/2012) (pages 1415–1419)

      Article first published online: 5 DEC 2012 | DOI: 10.1002/aenm.201290056

  5. Communications

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Communications
    7. Full Papers
    1. Synergistic Effect of Processing Additives and Optical Spacers in Bulk-Heterojunction Solar Cells (pages 1420–1424)

      Sooncheol Kwon, Jin Kuen Park, Geunjin Kim, Jaemin Kong, Guillermo C. Bazan and Kwanghee Lee

      Article first published online: 15 JUN 2012 | DOI: 10.1002/aenm.201200311

      Thumbnail image of graphical abstract

      Processing a bulk-heterojunction (BHJ) solar cell with a narrow-bandgap polymer (P1) and a fullerene (PC71BM) results in a smooth surface morphology, and better performance is observed when a 1-chloronaphthalene solvent additive is used. The smooth surface enables the introduction of a titanium suboxide (TiOx) optical spacer between the BHJ layer and the electrode, which increases light absorption by redistributing the light intensity. TiOx incorporation leads to increases in the power conversion efficiency and device lifetime.

    2. Unique Structural Changes of Three-Dimensionally Ordered Macroporous TiO2 Electrode Materials During Electrochemical Cycling (pages 1425–1432)

      Hyejung Kim, Min Gyu Kim and Jaephil Cho

      Article first published online: 27 AUG 2012 | DOI: 10.1002/aenm.201200416

      Thumbnail image of graphical abstract

      Structural changes during lithium intercalation (to x = 1.1 in LixTiO2) are studied in three-dimensionally ordered macroporous (3DOM)-TiO2 (figure) prepared by colloidal crystal templating. During the charging/discharging cycles, the pristine crystalline domains are pulverized to smaller nanodomains (∼4 nm), but the original 3DOM structure remains robust and maintains its pristine pore-wall thickness. The long-range ordered crystalline orthorhombic phase is partially transformed into the short-range order amorphous phase and Jahn–Teller distortion is also observed.

    3. High Fill Factor Polymer Solar Cells Incorporating a Low Temperature Solution Processed WO3 Hole Extraction Layer (pages 1433–1438)

      Tobias Stubhan, Ning Li, Norman A. Luechinger, Samuel C. Halim, Gebhard J. Matt and Christoph J. Brabec

      Article first published online: 13 AUG 2012 | DOI: 10.1002/aenm.201200330

      Thumbnail image of graphical abstract

      Solution-processed tungsten oxide (WO3) is incorporated as a hole extraction layer in polymer solar cells. The smooth WO3 films are deposited from an alcohol-based, surfactant-free nanoparticle solution which allows the achievement of full functionality via annealing at only 80 °C (no oxygen plasma). The WO3 devices reach fill factors above 67% and efficiencies of around 3%.

  6. Full Papers

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Communications
    7. Full Papers
    1. Enhanced Hydrogen Storage in Graphene Oxide-MWCNTs Composite at Room Temperature (pages 1439–1446)

      Seyed Hamed Aboutalebi, Sima Aminorroaya-Yamini, Ivan Nevirkovets, Konstantin Konstantinov and Hua Kun Liu

      Article first published online: 3 AUG 2012 | DOI: 10.1002/aenm.201200154

      Thumbnail image of graphical abstract

      Controlling the microstructure of architecturally engineered carbon based materials is essential for tailoring their hydrogen storage properties. This study demonstrates that controlling the interlayer spacing of architecturally engineered graphene oxide frameworks through intercalating one-dimensional spacers with high hydrogen capacity is the key to developing high hydrogen capacity devices.

    2. Tail State-Assisted Charge Injection and Recombination at the Electron-Collecting Interface of P3HT:PCBM Bulk-Heterojunction Polymer Solar Cells (pages 1447–1455)

      He Wang, Manas Shah, Venkat Ganesan, Michael L. Chabinyc and Yueh-Lin Loo

      Article first published online: 24 JUL 2012 | DOI: 10.1002/aenm.201200361

      Thumbnail image of graphical abstract

      The lamination of P3HT and PCBM thin films at the electron- and hole-collecting interfaces, respectively, in bulk-heterojunction polymer solar cells disrupts Jsc to different extents. The presence of a broad distribution of tail states in P3HT facilitates recombination at the electron-collecting interface and subsequent injection of holes from the cathode; devices having P3HT at the electron-collecting interface can thus maintain high Jsc.

    3. UV-Rearranged PIM-1 Polymeric Membranes for Advanced Hydrogen Purification and Production (pages 1456–1466)

      Fu Yun Li, Youchang Xiao, Yee Kang Ong and Tai-Shung Chung

      Article first published online: 17 JUL 2012 | DOI: 10.1002/aenm.201200296

      Thumbnail image of graphical abstract

      The polymer chains of PIM-1 undergo 1,2-migration reaction and transform to close-to-planar like rearranged structure after ultraviolet (UV) irradiation. As a result, the UV-irradiated PIM-1 membrane shows considerable drops in both fractional free volume (FFV) and size of micro-pores. The resultant PIM-1 membranes are used for H2/CO2 separation and reveal far superior separation performance to others in the literature.

    4. Semi-Transparent Tandem Organic Solar Cells with 90% Internal Quantum Efficiency (pages 1467–1476)

      Zheng Tang, Zandra George, Zaifei Ma, Jonas Bergqvist, Kristofer Tvingstedt, Koen Vandewal, Ergang Wang, L. Mattias Andersson, Mats R. Andersson, Fengling Zhang and Olle Inganäs

      Article first published online: 16 JUL 2012 | DOI: 10.1002/aenm.201200204

      Thumbnail image of graphical abstract

      Semi-transparent solar cells constructed on ITO substrate modified by a conjugated polymer interlayer exhibit high internal quantum efficiency (∼90%), high transmittance (∼50%), low reflective loss, and low parasitic loss, which enables the construction of efficient tandem solar cells with good transmittance (∼25%).

    5. Excitation Dynamics in Low Band Gap Donor–Acceptor Copolymers and Blends (pages 1477–1482)

      Björn Gieseking, Berthold Jäck, Eduard Preis, Stefan Jung, Michael Forster, Ullrich Scherf, Carsten Deibel and Vladimir Dyakonov

      Article first published online: 16 JUL 2012 | DOI: 10.1002/aenm.201200304

      Thumbnail image of graphical abstract

      The excitation dynamics in donor-acceptor copolymer PCDTBT are analyzed using comparative absorption and PL measurements of the polymer and its building blocks as well as a time-resolved PL study of neat copolymer and blend films. The results indicate that the effective coupling between copolymer building blocks governs the photovoltaic performance of the blends.

    6. Nongeminate Recombination in Planar and Bulk Heterojunction Organic Solar Cells (pages 1483–1489)

      Alexander Foertig, Alexander Wagenpfahl, Thiemo Gerbich, David Cheyns, Vladimir Dyakonov and Carsten Deibel

      Article first published online: 18 OCT 2012 | DOI: 10.1002/aenm.201200718

      Thumbnail image of graphical abstract

      Two prominent organic solar cell device architectures, planar and bulk heterojunction, both based on CuPc and C60, are directly compared in terms of nongeminate recombination and charge carrier distribution. Transient photovoltage and charge extraction as well as a macroscopic device simulations are applied to reveal the origin of different Voc vs. light intensity dependence.

    7. Surface-Initiated Growth of Thin Oxide Coatings for Li–Sulfur Battery Cathodes (pages 1490–1496)

      Kyu Tae Lee, Robert Black, Taeeun Yim, Xiulei Ji and Linda F. Nazar

      Article first published online: 27 AUG 2012 | DOI: 10.1002/aenm.201200006

      Thumbnail image of graphical abstract

      The concept of surface-initiated growth of oxides on functionalized carbons is introduced as a method to inhibit the dissolution of polysulfide ions in Li–S battery cathode materials. MOx (M: Si, V) thin layers are homogeneously coated on nanostructured carbon–sulfur composites. The coating significantly inhibits the dissolution of polysulfides on cycling, resulting in enhanced cycle performance and coulombic efficiency of the Li–S battery.

    8. Formation of 1D Hierarchical Structures Composed of Ni3S2 Nanosheets on CNTs Backbone for Supercapacitors and Photocatalytic H2 Production (pages 1497–1502)

      Ting Zhu, Hao Bin Wu, Yabo Wang, Rong Xu and Xiong Wen (David) Lou

      Article first published online: 2 OCT 2012 | DOI: 10.1002/aenm.201200269

      Thumbnail image of graphical abstract

      Coaxial CNT-supported Ni3S2 ultrathin nanosheets fabricated via a multi-step conversion route exhibit interesting properties as electrode materials for supercapacitors and as a photocatalyst for hydrogen production from water splitting.

    9. A New Heteroleptic Ruthenium Sensitizer for Transparent Dye-Sensitized Solar Cells (pages 1503–1509)

      Chia-Yuan Chen, Nuttapol Pootrakulchote, Min-Yu Chen, Thomas Moehl, Hui-Hsu Tsai, Shaik M. Zakeeruddin, Chun-Guey Wu and Michael Grätzel

      Article first published online: 17 JUL 2012 | DOI: 10.1002/aenm.201200285

      Thumbnail image of graphical abstract

      A new ruthenium complex, CYC-B19, incorporating a hexylthio-bithiophene based ancillary ligand and a vinyl-conjugated anchoring ligand, exhibits a MLCT band centred at 562 nm with a high molar absorption coefficient of 2.97 × 104 M−1 cm−1. The transparent device sensitized by CYC-B19 reaches a good photovoltaic efficiency of 8.4% and a superior spectral response to its predecessor CYC-B11.

    10. Graphene Multilayer Supported Gold Nanoparticles for Efficient Electrocatalysts Toward Methanol Oxidation (pages 1510–1518)

      Yuri Choi, Minsu Gu, Jongnam Park, Hyun-Kon Song and Byeong-Su Kim

      Article first published online: 26 JUL 2012 | DOI: 10.1002/aenm.201200214

      Thumbnail image of graphical abstract

      Electroactive Au nanoparticles are integrated with a graphene oxide nanosheet support by layer-by-layer assembly for methanol oxidation in an alkaline media. By controlling the number of bilayers and post-thermal treatment, new types of 3-dimensional electrocatalytic thin films exhibit better electrocatalytic activity and stability than that of Au nanoparticles without graphene nanosheet supports.

SEARCH

SEARCH BY CITATION