Université de Strasbourg, CNRS, ISIS, 8 alleé Gaspard Monge, 67000 Strasbourg, France.
Department of Chemistry & IRIS Adlershof, Humboldt-Universität zu Berlin, Brook-Taylor-Straße 2, 12489 Berlin, Germany.
J Am Chem Soc. 2020 Jun 24;142(25):11050-11059. doi: 10.1021/jacs.0c02961. Epub 2020 Jun 11.
The integration of photochromic molecules into semiconducting polymer matrices via blending has recently attracted a great deal of attention, as it provides the means to reversibly modulate the output signal of electronic devices by using light as a remote control. However, the structural and electronic interactions between photochromic molecules and semiconducting polymers are far from being fully understood. Here we perform a comparative investigation by combining two photochromic diarylethene moieties possessing similar energy levels yet different propensity to aggregate with five prototypical polymer semiconductors exhibiting different energy levels and structural order, ranging from amorphous to semicrystalline. Our in-depth photochemical, structural, morphological, and electrical characterization reveals that the photoresponsive behavior of thin-film transistors including polymer/diarylethenes blends as the active layer is governed by a complex interplay between the relative position of the energy levels and the polymer matrix microstructure. By matching the energy levels and optimizing the molecular packing, high-performance optically switchable organic thin-film transistors were fabricated. These findings represent a major step forward in the fabrication of light-responsive organic devices.
通过共混将光致变色分子整合到半导体聚合物基质中，最近引起了极大的关注，因为它提供了一种通过使用光作为远程控制来可逆调节电子设备输出信号的手段。然而，光致变色分子和半导体聚合物之间的结构和电子相互作用还远未被完全理解。在这里，我们通过组合两个具有相似能级但聚合倾向不同的光致变色二芳基乙烯部分，以及具有不同能级和结构有序性的五个典型聚合物半导体，对其进行了比较研究，范围从无定形到半结晶。我们深入的光化学、结构、形态和电学特性表明，包括聚合物/二芳基乙烯混合物作为有源层的薄膜晶体管的光响应行为受到能级的相对位置和聚合物基质微结构之间复杂相互作用的控制。通过匹配能级和优化分子堆积，制造出高性能的光开关有机薄膜晶体管。这些发现代表着在制造光响应有机器件方面迈出了重要的一步。
