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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 …
Publication date: 
1 May 2020

Marco Carroli, Duc T Duong, Ester Buchaca‐Domingo, Andrea Liscio, Karl Börjesson, Martin Herder, Vincenzo Palermo, Stefan Hecht, Natalie Stingelin, Alberto Salleo, Emanuele Orgiu, Paolo Samorì

Biblio References: 
Volume: 30 Issue: 20 Pages: 1907507
Advanced Functional Materials