Advanced Materials

Cover image for Vol. 26 Issue 31

Editor-in-Chief: Peter Gregory, Deputy Editors: Martin Ottmar, Carolina Novo da Silva, Lorna Stimson

Online ISSN: 1521-4095

Associated Title(s): Advanced Energy Materials, Advanced Engineering Materials, Advanced Functional Materials, Advanced Healthcare Materials, Advanced Materials Interfaces, Advanced Optical Materials, Particle & Particle Systems Characterization, Small

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Recently Published Articles

  1. The Clash of Mechanical and Electrical Size-Effects in ZnO Nanowires and a Double Power Law Approach to Elastic Strain Engineering of Piezoelectric and Piezotronic Devices

    Antonio Rinaldi, Rodolfo Araneo, Salvatore Celozzi, Marialilia Pea and Andrea Notargiacomo

    Article first published online: 19 AUG 2014 | DOI: 10.1002/adma.201401026

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    The piezoelectric performance of ultra-strength ZnO nanowires (NWs) depends on the subtle interplay between electrical and mechanical size-effects. “Size-dependent” modeling of compressed NWs illustrates why experimentally observed mechanical stiffening can indeed collide with electrical size-effects when size shrinks, thereby lowering the actual piezoelectric function from bulk estimates. “Smaller” is not necessarily “better” in nanotechnology.

  2. Highly Oriented Polymer Semiconductor Films Compressed at the Surface of Ionic Liquids for High-Performance Polymeric Organic Field-Effect Transistors

    Junshi Soeda, Hiroyuki Matsui, Toshihiro Okamoto, Itaru Osaka, Kazuo Takimiya and Jun Takeya

    Article first published online: 19 AUG 2014 | DOI: 10.1002/adma.201401495

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    A novel and versatile method to align polymer semiconductors is demonstrated. Spreading and subsequent mechanical compression of a polymer thin film on an ionic liquid's surface yield a polymer thin film that has high uniaxial orientation of the polymer backbone, which is tested for typical polymer semiconductors of PB16TTT, PNDTBTC20, and P3HT. TFTs fabricated by the method exhibit significantly higher mobility compared to TFTs fabricated using a conventional spin-coating process.

  3. A Smart “Sense-Act-Treat” System: Combining a Ratiometric pH Sensor with a Near Infrared Therapeutic Gold Nanocage

    Peng Shi, Zhen Liu, Kai Dong, Enguo Ju, Jinsong Ren, Yingda Du, Zhengqiang Li and Xiaogang Qu

    Article first published online: 15 AUG 2014 | DOI: 10.1002/adma.201402522

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    Herein, we design a “sense-act-treat” system via the combination of a ratiometric pH sensor with a therapeutic gold nanocage. Our design could “sense” the tumor through two-state switching of fluorescence and further provide chemotherapy and hyperthermia for “treating” the tumor, showing the potential for future biomedical applications.

  4. Carbazole-Based Hole-Transport Materials for Efficient Solid-State Dye-Sensitized Solar Cells and Perovskite Solar Cells

    Bo Xu, Esmaeil Sheibani, Peng Liu, Jinbao Zhang, Haining Tian, Nick Vlachopoulos, Gerrit Boschloo, Lars Kloo, Anders Hagfeldt and Licheng Sun

    Article first published online: 15 AUG 2014 | DOI: 10.1002/adma.201402415

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    Two carbazole-based small molecule hole-transport materials (HTMs) are synthesized and investigated in solid-state dye-sensitized solar cells (ssDSCs) and perovskite solar cells (PSCs). The HTM X51-based devices exhibit high power conversion efficiencies (PCEs) of 6.0% and 9.8% in ssDSCs and PSCs, respectively. These results are superior or comparable to those of 5.5% and 10.2%, respectively, obtained for the analogous cells using the state-of-the-art HTM Spiro-OMeTAD.

  5. Boosting the Power Conversion Efficiency of Perovskite Solar Cells Using Self-Organized Polymeric Hole Extraction Layers with High Work Function

    Kyung-Geun Lim, Hak-Beom Kim, Jaeki Jeong, Hobeom Kim, Jin Young Kim and Tae-Woo Lee

    Article first published online: 14 AUG 2014 | DOI: 10.1002/adma.201401775

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    A self-organized hole extraction layer (SOHEL) with high work function (WF) is designed for energy level alignment with the ionization potential level of CH3NH3PbI3. The SOHEL increases the built-in potential, photocurrent, and power conversion efficiency (PCE) of CH3NH3PbI3 perovskite solar cells. Thus, interface engineering of the positive electrode of solution-processed planar heterojunction solar cells using a high-WF SOHEL is a very effective way to achieve high device efficiency (PCE = 11.7% on glass).