Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 1, Issue 20, Pages 2999-3003Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jz101194d
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Funding
- Federal Ministry of Education and Research (BMBF) [03SF0338C]
- EWE AG, Oldenburg
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So-called charge transfer complexes (CTCs) in plastic solar cell materials have recently become one of the main focuses in research on organic photovoltaics. Because these states influence the relevant parameters of organic solar cells, it is of fundamental interest to understand fully the underlying processes. In the present work we show that CTC states can be captured by light-induced electron spin resonance (I-ESR) with a much higher sensitivity than is possible with previously applied methods, such as photoinduced absorption spectroscopy. We take advantage of the I-ESR technique to demonstrate the existence of CTC states by their direct excitation with low-energy photons in an organic polymer/fullerene blend and for the first time, also in hybrid blends of poly(3-hexylthiophene) and CdSe nanoparticles. Moreover the recombination kinetics is analyzed and discussed.
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