標題: Lnfrared photocurrent response of charge-transfer exciton in polymer bulk heterojunction
作者: Yang, Chia-Ming
Tsai, Pei-Yu
Horng, Sheng-Fu
Lee, Kuan-Chen
Tzeng, Shin-Rong
Meng, Hsin-Fei
Shy, Jow-Tsong
Shu, Ching-Fong
應用化學系
物理研究所
電子工程學系及電子研究所
Department of Applied Chemistry
Institute of Physics
Department of Electronics Engineering and Institute of Electronics
公開日期: 25-Feb-2008
摘要: We study the charge-transfer exciton absorption and photocurrent response in solution-processed bulk heterojunction based on poly(3-hexylthiophene) donor and (6,6)-phenyl-C(61)-butyric acid methyl ester acceptor in the near-infrared wavelength region. While the exciton absorption exists only for wavelength below 650 nm, direct generation of charge-transfer exciton formed between the donor and acceptor extends the absorption wavelength to 950 nm. For films with micrometer thickness, the photon-to-electron conversion efficiency is about 60% at 750 nm wavelength under reverse voltage bias and the photocurrent to dark current ratio is about 8.6 at 900 nm and remains 3.6 even at 1000 nm. Photodetector with high sensitivity covering exclusively the 650-1000 nm near infrared region can therefore be made without a low bandgap material. The charge-transfer exciton absorption coefficient and photocurrent sensitivity depend on the annealing condition which controls the donor-acceptor morphology. (c) 2008 American Institute of Physics.
URI: http://dx.doi.org/10.1063/1.2839397
http://hdl.handle.net/11536/9658
ISSN: 0003-6951
DOI: 10.1063/1.2839397
期刊: APPLIED PHYSICS LETTERS
Volume: 92
Issue: 8
結束頁: 
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