期刊
JOURNAL OF PHYSICAL CHEMISTRY B
卷 119, 期 43, 页码 13543-13548出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcb.5b02142
关键词
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资金
- Russian Foundation for Fundamental Research [15-03-07682a]
- Ministry of Science and Education of Russian Federation
- Russian Federation [SP-3596.2013.1]
The light-induced charge-transfer (CT) state in the composite of the conductive polymer poly(3-hexylthiophene) (P3HT) and the fullerene derivative [6,6]-phenyl-C-61-butyric acid methyl ester (PCBM) has been studied by electron spin echo (ESE) spectroscopy. The out-of-phase ESE signal corresponding to the spin-correlated radical pair P3HT(+)/PCBM- has been observed in this composite material. The time-domain ESE shape for different delays between the laser flash and the microwave pulse sequence has been analyzed. In order to explain the evolution of the out-of-phase ESE signal as a function of the delay between the microwave pulses, a model of the CT state is proposed. The hole is assumed to be delocalized on the P3HT chain over several thiophene subunits, while the point-dipole approximation is used to describe the interaction with the electron on PCBM. The distribution of distances between the positive and negative charges in the CT state has been evaluated.
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