期刊
MICROELECTRONIC ENGINEERING
卷 218, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.mee.2019.111147
关键词
Organic photodetectors; Ternary bulk heterojunction; Exciton dissociation; Microscopic morphology
资金
- Shaanxi Provincial Natural Science Foundation Research Project Fund [2019JM-251]
In this work, we report an ternary bulk heterojunction (t-BHJ) organic photodetectors (OPDs) based on P3HT, PTB7 and PC61BM. The effects of PTB7 added to P3HT:PC61BM on the optical and electrical properties of OPDs were investigated. It is found that when the mass ratio of P3HT:PTB7:PC61BM is 8:2:10, the response spectrum of the active layer is extended to 780 nm, The responsivity (R) and external quantum efficiency (EQE) of the OPDs are reached 178, 291, 241 mA/W and 35%, 68%, 65%, under 630, 530, and 460 nm illumination and similar to 1 V bias, respectively, and the detectivity (D*) reached 10(12) Jones. The results show that the addition of PTB7 with appropriate mass ratio can increases the exciton generation and dissociation probability in P3HT:PC61BM, which increases the photocurrent of the device. In addition, the addition of PTB7 promotes the crystallization of the film, reduces the density of trap defects in the film, and reduces the dark current of the device.
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