Highly oriented stretchable polymer semiconductor thin films for polarization-sensitive organic phototransistors
발표자
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초록
내용
Herein, we demonstrate polarization-sensitive organic phototransistors (PS-OPTs) comprising of highly oriented stretchable polymer semiconductor thin films based on poly(4-(5-(4,4-dihexadecyl-4H-cyclopenta[1,2-b:5,4-b']dithiophen-2-yl)thiophen-2-yl)-5,6-difluoro-2-octyl-7-(thiophen-2-yl)-2H-benzo[d][1,2,3]triazole) (PCDTFBTA) as photo-active charge transport layers. The stretched PCDTFBTA thin films prepared by dry contact transfer printing under tensile strain showed gradually improved charge carrier mobility (up to 0.4 cm2/V-s) and dichroic ratio (>3.5) as strain increased. As a result, photocurrent anisotropy ratio of PS-OPTs increased to approximately 50 as the thin films were stretched at 150%, leading to polarization-dependent responsivity (R), sensitivity (P), external quantum efficiency (EQE), and specific detectivity (D*). Our results provide a facile strategy for developing polarization-sensitive phototransistors and arrays.