標題: Ultrafast photoexcited dynamics probe of blends of conjugated polymer poly{bi(dodecyl)thiophene-thieno[3,4-c]pyrrole-4,6-dione} and fullerenes for photovoltaic applications with broadband sub-10-fs visible pulse
作者: Kao, Chih-Hsien
Yabushita, Atsushi
Su, Yu-Wei
Wei, Kung-Hwa
Lee, Yu-Hsien
Kobayashi, Takayoshi
材料科學與工程學系
電子物理學系
Department of Materials Science and Engineering
Department of Electrophysics
公開日期: Mar-2016
摘要: Conjugated polymers have been widely studied as active materials for organic solar cells, which are a promising replacement for silicon solar cells. A novel electron donor polymer of poly{bi(dodecyl)thiophene-thieno[3,4-c]pyrrole-4,6-dione} (PBTTPD) blended with an electron acceptor, [6,6]-phenyl C-71 butyric acid methyl ester (PC71BM), gave a device power conversion efficiency as high as 7.3%. In the present work, we performed time-resolved absorption change spectroscopy at various mixture ratios of PC71BM in the PBTTPD/PC71BM blend. Among the obtained time constants, the shortest (60 fs) and the longest (500 fs and 15 ps) were assigned to the production and relaxation of charge-transfer (CT) states, respectively. The PC71BM blended with PBTTPD was found to suppress interchain carrier transport and increase intrachain carrier transport. The prolonged lifetime of the CT state in the equally blended PBTTPD/PC71BM film increases the probability of charge separation and thus increases the power conversion efficiency of the device. (C) 2016 The Japan Society of Applied Physics
URI: http://dx.doi.org/10.7567/JJAP.55.032302
http://hdl.handle.net/11536/134202
ISSN: 0021-4922
DOI: 10.7567/JJAP.55.032302
期刊: JAPANESE JOURNAL OF APPLIED PHYSICS
Volume: 55
Issue: 3
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