期刊
ACS APPLIED MATERIALS & INTERFACES
卷 7, 期 40, 页码 22660-22668出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b07522
关键词
polymer photodetectors; photomultiplication; self-assembly; tunneling injection; mobility
资金
- Fundamental Research Funds for the Central Universities [2014JBZ017]
- National Natural Science Foundation of China [61377029]
- Beijing Natural Science Foundation [2122050]
- Beijing Synchrotron Radiation Facility (BSRF) of the Institute of High Energy, Chinese Academy of Science
A series of photomultiplication (PM)-type polymer photodetectors (PPDs) were fabricated with polymer poly(3-hexylthiophene)-[6,6]-phenyl-C-71-butyric acid methyl ester (P3HT-PC71BM) (100:1, w/w) as the active layers, the only difference being the self-assembly time of the active layers for adjusting the P3HT molecular arrangement. The grazing incidence X-ray diffraction (GIXRD) results exhibit that P3HT molecular arrangement can be adjusted between face-on and edge-on structures by controlling the self-assembly time. The champion EQE value of PPDs, based on the active layers without the self-assembly process, arrives at 6380% under 610 nm light illumination at -10 V bias, corresponding to the face-on molecular arrangement of P3HT in the active layers. The EQE values of PPDs were markedly decreased to 1600%, along with the self-assembly time up to 12 min, which should be attributed to the variation of absorption and hole transport ability of the active layers induced by the change of P3HT molecular arrangement. This finding provides an effective strategy for improving the performance of PM-type PPDs by adjusting the molecular arrangement, in addition to the enhanced trap-assisted charge-carrier tunneling injection.
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