Copyright © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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
Materials Science Weekly Newsletter
Recently Published Articles
- 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
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.
- 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
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.
- 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
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.
- 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
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.
- 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
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).