期刊
ORGANIC ELECTRONICS
卷 13, 期 6, 页码 1031-1037出版社
ELSEVIER
DOI: 10.1016/j.orgel.2012.02.023
关键词
Photomodulation spectroscopy; Organic photovoltaic materials; Delocalized polarons; Quantum interference anti-resonances
资金
- DOE [DE-FG02-04ER46109]
- MRSEC at the University of Utah [DMR11-21252]
- NSF China [61006014]
- National High Technology Research and Development Program of China [2011AA050520]
- NUST [2011ZDJH23]
- NUST
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1121252] Funding Source: National Science Foundation
We used the transient and steady state photomodulation spectroscopies for studying the photoexcitations dynamics in blends of regio-regular poly(3-hexylthiophene) (RR-P3HT) and fullerene in a broad spectral range from 0.13 to 2.25 eV. We found that both localized polarons and singlet excitons are instantaneously photogenerated in the blends. However the photogeneration process of delocalized polarons which contribute to the photocurrent proceeds in two steps: first, within a couple of ps the excitons generated in the polymer domains populate the charge transfer complex states at the RR-P3HT/fullerene interfaces; this is followed by the charge transfer ionization into delocalized charge polarons in the polymer and fullerene constituents within similar to 20 ps. In contrast, the localized polaron dynamics are unrelated with the excitons and delocalized polarons dynamics. We also report on the occurrence of ultrafast quantum interference anti-resonances between photoinduced infrared-active vibrations and the delocalized polaron band in the blends, which shows the delocalization character of the photogenerated charges that contribute to the photocurrent. Published by Elsevier B.V.
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