Charge carrier photogeneration and decay dynamics in the poly(2,7-carbazole) copolymer PCDTBT and in bulk heterojunction composites with PC70BM

被引:107
作者
Tong, Minghong [1 ]
Coates, Nelson E. [1 ]
Moses, Daniel [1 ]
Heeger, Alan J. [1 ]
Beaupre, Serge [2 ]
Leclerc, Mario [2 ]
机构
[1] Univ Calif Santa Barbara, Ctr Polymers & Organ Solids, Santa Barbara, CA 93106 USA
[2] Univ Laval, Dept Chim, Quebec City, PQ G1K 7P4, Canada
关键词
POLYMER SOLAR-CELLS; BAND-GAP COPOLYMERS; ELECTRON-TRANSFER; PERFORMANCE; POLYFLUORENE; PHOTOCONDUCTIVITY;
D O I
10.1103/PhysRevB.81.125210
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Charge carrier photogeneration and decay were studied in poly[N-9(')-hepta-decanyl- 2,7-carbazole-alt-5,5-(4('),7(')-di-2-thienyl-2('),1('),3(')-benzothiadiazole)], PCDTBT, and in phase-separated mixtures of PCDTBT with the fullerene derivative [6,6]-phenyl C-70-butyric acid methyl ester (PC70BM). The absorption spectrum of PCDTBT exhibits two distinct absorption bands centered at approximately 400 nm and 600 nm, respectively. In pristine PCDTBT, higher carrier quantum efficiency and lower photoluminescence efficiency are observed following excitation via the higher-energy absorption band. In contrast, in the PCDTBT-fullerene bulk heterojunction material, the carrier generation efficiency is an order of magnitude larger but essentially independent of the excitation wavelength. The photoinduced absorption of PCDTBT:PC70BM is interpreted in terms of ultrafast charge transfer, trap filling, and long-lived mobile carriers.
引用
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页数:6
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