The Role of Morphology in Optically Switchable Transistors Based on a Photochromic Molecule/p‐Type Polymer Semiconductor Blend
The Role of Morphology in Optically Switchable Transistors Based on a Photochromic Molecule/p‐Type Polymer Semiconductor Blend
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形态在基于光致变色分子/p型聚合物半导体混合物的光开关晶体管中的作用
DOI：
10.1002/adfm.201907507
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发表时间：
2019
影响因子：
19
通讯作者：
P. Samorí
中科院分区：
文献类型：
--
作者：
M. Carroli;D. T. Duong;E. Buchaca;A. Liscio;K. Börjesson;M. Herder;V. Palermo;S. Hecht;N. Stingelin;A. Salleo;E. Orgiu;P. Samorí
通过改变共轭聚合物的分子量（Mw = 20-100 kDa）和区域规整性以及薄膜中的热退火温度（rt-160 °C），研究了基于光致变色二芳基乙烯（DAE）和聚（3-己基噻吩）（P3 HT）共混物的有机薄膜晶体管中形态和光电性能之间的相关性。P3 HT/DAE共混物的半结晶结构包括结晶域，确保有效的电荷传输，以及较少的聚集区域，其中DAE由于在自组装期间从结晶域自发排出而位于聚集区域。在含有Mw = 50 kDa的P3 HT的共混物中观察到场效应迁移率（μ）和开关能力之间的最佳折衷，表现出μ高达1 × 10−3 cm 2 V−1 s−1，结合>50%的光开关比率。发现高于或低于50 kDa的Mw对于场效应迁移率是有害的，并导致器件电流可切换性降低。发现区域规则P3 HT共混物的微结构对热退火温度敏感，观察到μ的增加和电流调制的降低作为对光刺激的响应，可能是由于P3 HT-DAE偏析增加，部分阻碍DAE光异构化。研究结果表明，微调的结构和形态的双组分膜的利用光电器件的多功能性是至关重要的。
The correlation between morphology and optoelectronic performance in organic thin‐film transistors based on blends of photochromic diarylethenes (DAE) and poly(3‐hexylthiophene) (P3HT) is investigated by varying molecular weight (Mw = 20–100 kDa) and regioregularity of the conjugated polymer as well as the temperature of thermal annealing (rt‐160 °C) in thin films. Semicrystalline architectures of P3HT/DAE blends comprise crystalline domains, ensuring efficient charge transport, and less aggregated regions, where DAEs are located as a result of their spontaneous expulsion from the crystalline domains during the self‐assembly. The best compromise between field‐effect mobility (μ) and switching capabilities is observed in blends containing P3HT with Mw = 50 kDa, exhibiting μ as high as 1 × 10−3 cm2 V−1 s−1 combined with a >50% photoswitching ratio. Higher or lower Mw than 50 kDa are found to be detrimental for field‐effect mobility and to lead to reduced device current switchability. The microstructure of the regioregular P3HT blend is found to be sensitive to the thermal annealing temperature, with an increase in μ and a decrease in current modulation being observed as a response to the light‐stimulus likely due to an increased P3HT‐DAE segregation, partially hindering DAE photoisomerization. The findings demonstrate the paramount importance of fine tuning the structure and morphology of bicomponent films for leveraging the multifunctional nature of optoelectronic devices.
影响因子：
38.3
作者：
Leydecker, Tim;Herder, Martin;Samori, Paolo
通讯作者：
Samori, Paolo
影响因子：
21.8
作者：
Orgiu, Emanuele;Crivillers, Nuria;Samori, Paolo
通讯作者：
Samori, Paolo
影响因子：
41.2
作者：
Campoy-Quiles, Mariano;Ferenczi, Toby;Nelson, Jenny
通讯作者：
Nelson, Jenny