Journal
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
Volume 58, Issue 5, Pages -Publisher
SCIENCE PRESS
DOI: 10.1007/s11433-014-5634-7
Keywords
organic photodetectors; photomultiplication; P3HT; ICBA
Categories
Funding
- National Training Program of Innovation and Entrepreneurship for Undergraduates
- Fundamental Research Funds for the Central Universities [2014JBZ017]
- National Natural Science Foundation of China [613770029]
- Beijing Natural Science Foundation [2122050]
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Here, we report a trap-assisted photomultiplication ( PM) phenomenon in solution-processed organic photodetectors (OPDs) using poly(3-hexylthiophene) (P3HT): indene-C60 bisadduct ( ICBA) as the active layer. The maximum external quantum efficiency (EQE) is 685% for the device with 2% ICBA doping ratio, which is much higher than that of OPDs with P3HT: ICBA ( 1: 1) as the active layer. The PM phenomenon is attributed to the hole tunneling injection assisted by trapped electron in ICBA near Al cathode, which can be demonstrated from the EQE spectra and transient photocurrent curves of OPDs with different ICBA doping ratios.
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