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Relieving the Photosensitivity of Organic Field‐Effect Transistors
Author(s) -
Liu Jie,
Jiang Longfeng,
Shi Jia,
Li Chunlei,
Shi Yanjun,
Tan Jiahui,
Li Haiyang,
Jiang Hui,
Hu Yuanyuan,
Liu Xinfeng,
Yu Junsheng,
Wei Zhongming,
Jiang Lang,
Hu Wenping
Publication year - 2020
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201906122
Subject(s) - photosensitivity , materials science , field effect transistor , transistor , optoelectronics , organic field effect transistor , field (mathematics) , nanotechnology , electrical engineering , voltage , mathematics , pure mathematics , engineering
It is generally believed that the photoresponse behavior of organic field‐effect transistors (OFETs) reflects the intrinsic property of organic semiconductors. However, this photoresponse hinders the application of OFETs in transparent displays as driven circuits due to the current instability resulting from the threshold voltage shift under light illumination. It is necessary to relieve the photosensitivity of OFETs to keep the devices stable. 2,6‐diphenyl anthracene thin‐film and single‐crystal OFETs are fabricated on different substrates, and it is found that the degree of molecular order in the conducting channels and the defects at the dielectric/semiconductor interface play important roles in determining the phototransistor performance. When highly ordered single‐crystal OFETs are fabricated on polymeric substrates with low defects, the photosensitivity ( P ) decreases by more than 10 5 times and the threshold voltage shift (Δ V T ) is almost eliminated compared with the corresponding thin‐film OFETs. This phenomenon is further verified by using another three organic semiconductors for similar characterizations. The decreased P and Δ V T of OFETs ensure a good current stability for OFETs to drive organic light‐emitting diodes efficiently, which is essential to the application of OFETs in flexible and transparent displays.