Advanced Materials

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Recently Published Articles

  1. The Crystallization of PEDOT:PSS Polymeric Electrodes Probed In Situ during Printing

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

    Article first published online: 22 APR 2015 | DOI: 10.1002/adma.201500315

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    The evolution of nanomorphology in printed polymeric electrodes is investigated by in situ grazing incident wide angle 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 cosolvent additives influence conducting polymers in terms of interchain coupling, molecular orientation, and crystallite sizes.

  2. Perovskite Microdisk Microlasers Self-Assembled from Solution

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

    Article first published online: 22 APR 2015 | DOI: 10.1002/adma.201500449

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    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.

  3. Schmitt Trigger Using a Self-Healing Ionic Liquid Gated Transistor

    Simon Bubel, Matthew S. Menyo, Thomas E. Mates, J. Herbert Waite and Michael L. Chabinyc

    Article first published online: 22 APR 2015 | DOI: 10.1002/adma.201500556

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    Electrical double layer transistors using ionic liquids as the gate and ZnO as the semiconductor exhibit stable operation in the presence of redox active additives. The characteristics of the device enable single components with the response of a Schmitt trigger.

  4. Transfer Printing of Metallic Microstructures on Adhesion-Promoting Hydrogel Substrates

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

    Article first published online: 22 APR 2015 | DOI: 10.1002/adma.201500954

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    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.

  5. Small-Bandgap Polymer Solar Cells with Unprecedented Short-Circuit Current Density and High Fill Factor

    Hyosung Choi, Seo-Jin Ko, Taehyo Kim, Pierre-Olivier Morin, Bright Walker, Byoung Hoon Lee, Mario Leclerc, Jin Young Kim and Alan J. Heeger

    Article first published online: 21 APR 2015 | DOI: 10.1002/adma.201501132

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    Small-bandgap polymer solar cells (PSCs) with a thick bulk heterojunction film of 340 nm exhibit high power conversion efficiencies of 9.40% resulting from high short-circuit current density (JSC) of 20.07 mA cm−2 and fill factor of 0.70. This remarkable efficiency is attributed to maximized light absorption by the thick active layer and minimized recombination by the optimized lateral and vertical morphology through the processing additive.