Advanced Materials

doi: 10.1002/adma.201570151pmid: N/A

Palumbiny, Claudia M.; Liu, Feng; Russell, Thomas P.; Hexemer, Alexander; Wang, Cheng; Müller‐Buschbaum, Peter

doi: 10.1002/adma.201570148pmid: N/A

Organic electronics have emerged into a highly interesting field of research with a great variety of applications. On page 3391, P. Müller‐Buschbaum and co‐workers demonstrate the importance of in situ investigations during the printing process of organic electronics. In situ grazing‐incidence wide‐angle X‐ray scattering is used to follow the crystallization process of highly conductive PEDOT:PSS polymer mixtures. These findings are important for tuning transparent polymeric electrodes for organic electronics. Cover Image by Christoph Hohmann, Nanosystems Initiative Munich (NIM).

Wang, Fei; Gao, Weiwei; Thamphiwatana, Soracha; Luk, Brian T.; Angsantikul, Pavimol; Zhang, Qiangzhe; Hu, Che‐Ming J.; Fang, Ronnie H.; Copp, Jonathan A.; Pornpattananangkul, Dissaya; Lu, Weiyue; Zhang, Liangfang

doi: 10.1002/adma.201570150pmid: N/A

Cheng, Tao; Zhang, Yizhou; Lai, Wen‐Yong; Huang, Wei

doi: 10.1002/adma.201405864pmid: 25920067

Flexible and stretchable electronics represent today's cutting‐edge electronic technologies. As the most‐fundamental component of electronics, the thin‐film electrode remains the research frontier due to its key role in the successful development of flexible and stretchable electronic devices. Stretchability, however, is generally more challenging to achieve than flexibility. Stretchable electronic devices demand, above all else, that the thin‐film electrodes have the capacity to absorb a large level of strain (>>1%) without obvious changes in their electrical performance. This article reviews the progress in strategies for obtaining highly stretchable thin‐film electrodes. Applications of stretchable thin‐film electrodes fabricated via these strategies are described. Some perspectives and challenges in this field are also put forward.

Kim, Chunjoong; Phillips, Patrick J.; Key, Baris; Yi, Tanghong; Nordlund, Dennis; Yu, Young‐Sang; Bayliss, Ryan D.; Han, Sang‐Don; He, Meinan; Zhang, Zhengcheng; Burrell, Anthony K.; Klie, Robert F.; Cabana, Jordi

Han, Wei‐Zhong; Huang, Ling; Ogata, Shigenobu; Kimizuka, Hajime; Yang, Zhao‐Chun; Weinberger, Christopher; Li, Qing‐Jie; Liu, Bo‐Yu; Zhang, Xi‐Xiang; Li, Ju; Ma, Evan; Shan, Zhi‐Wei

doi: 10.1002/adma.201500377

Palumbiny, Claudia M.; Liu, Feng; Russell, Thomas P.; Hexemer, Alexander; Wang, Cheng; Müller‐Buschbaum, Peter

doi: 10.1002/adma.201500315pmid: 25903292

The evolution of nanomorphology in printed polymeric electrodes is investigated by in situ grazing‐incidence wideangle X‐ray scattering (in situ GIWAXS). The effect of solvent additives on the PEDOT:PSS film‐formation process is analyzed. In situ and static GIWAXS measurements show how co‐solvent additives influence conducting polymers in terms of interchain coupling, molecular orientation, and crystallite size.

Wu, Haosheng; Sariola, Veikko; Zhu, Congcong; Zhao, Jingsi; Sitti, Metin; Bettinger, Christopher J.

doi: 10.1002/adma.201500954pmid: 25903565

Fabrication schemes that integrate inorganic microstructures with hydrogel substrates are essential for advancing flexible electronics. A transfer printing process that is made possible through the design and synthesis of adhesion‐promoting hydrogels as target substrates is reported. This fabrication technique may advance ultracompliant electronics by melding microfabricated structures with swollen hydrogel substrates.

Liao, Qing; Hu, Ke; Zhang, Haihua; Wang, Xuedong; Yao, Jiannian; Fu, Hongbing

doi: 10.1002/adma.201500449pmid: 25903387

Single‐crystalline square microdisks of CH3NH3PbBr3 are prepared by using a one‐step solution self‐assembly method. Single‐mode lasing at 557 nm is achieved based on a built‐in whispering gallery mode microresonator at room temperature. By partial replacement of Br with Cl, lasing wavelengths are continuously tuned from 525 to 557 nm.