期刊
ASIAN JOURNAL OF ORGANIC CHEMISTRY
卷 7, 期 11, 页码 2330-2336出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ajoc.201800392
关键词
diketopyrrolopyrroles; organic phototransistors; bulk heterojunction; photoresponse; organic materials
资金
- National Research Foundation (NRF) of Korea [2018R1D1A3B07046214, 2018R1D1A1B07051075, 2018R1A6A1A03024962, 2017M2A2A4A01071010, 2016H1D5A1910319]
A small molecular diketopyrrolopyrrole (DPP) derivative containing 2,4-difluorinated phenyl groups, 3,6-bis(5-((E)-2,4-difluorostyryl)thiophen-2-yl)-2,5-bis(2-ethylhexyl)-2,5-dihydropyrrolo[3,4-c]pyrrole-1,4-dione (EHD2FV), was synthesized by a cross-coupling reaction with 90% yield. The solid EHD2FV film exhibited a broad optical absorption up to 1000 nm, it featured a deep-lying LUMO energy (4.49 eV). EHD2FV was employed as an electron acceptor (n-type) for bulk heterojunction (BHJ) layers, which act as a sensing channel layer in organic phototransistors (OPTRs), while poly(3-hexylthiophene) (P3HT) was introduced as an electron donor (p-type). The OPTRs with the P3HT : EHD2FV BHJ layers were capable of sensing a deep red light (700 nm). The results showed that the best photosensing performance (photoresponsivity=337.1 mA/W) was achieved at the EHD2FV molar ratio of 0.05.
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