Nanochemistry Laboratory, Institut de Science et d'Ingénierie Supramoléculaires, Unité Mixte de Recherche 7006, Centre National de Recherche Scientifique, Université de Strasbourg, 8 allée Gaspard Monge, 67000 Strasbourg, France.
Nat Chem. 2012 Jun 24;4(8):675-9. doi: 10.1038/nchem.1384.
Organic semiconductors are suitable candidates for printable, flexible and large-area electronics. Alongside attaining an improved device performance, to confer a multifunctional nature to the employed materials is key for organic-based logic applications. Here we report on the engineering of an electronic structure in a semiconducting film by blending two molecular components, a photochromic diarylethene derivative and a poly(3-hexylthiophene) (P3HT) matrix, to attain phototunable and bistable energy levels for the P3HT's hole transport. As a proof-of-concept we exploited this blend as a semiconducting material in organic thin-film transistors. The device illumination at defined wavelengths enabled reversible tuning of the diarylethene's electronic states in the blend, which resulted in modulation of the output current. The device photoresponse was found to be in the microsecond range, and thus on a technologically relevant timescale. This modular blending approach allows for the convenient incorporation of various molecular components, which opens up perspectives on multifunctional devices and logic circuits.
有机半导体是适用于打印、柔性和大面积电子设备的候选材料。除了提高器件性能外，使所使用的材料具有多功能性质对于基于有机的逻辑应用至关重要。在这里，我们通过混合两种分子组件（光致变色二芳基乙烯衍生物和聚（3-己基噻吩）（P3HT）基质）来报告半导体膜中电子结构的工程设计，以实现 P3HT 空穴传输的光可调谐和双稳定能级。作为概念验证，我们将该混合物用作有机薄膜晶体管中的半导体材料。在定义的波长下对器件进行照射，使混合物中二芳基乙烯的电子态能够可逆地调谐，从而调制输出电流。发现器件的光响应时间在微秒范围内，因此在技术上相关的时间尺度内。这种模块化的混合方法允许方便地掺入各种分子组件，为多功能器件和逻辑电路开辟了前景。
