期刊
JOURNAL OF PHYSICAL CHEMISTRY B
卷 114, 期 45, 页码 14426-14429出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp1012347
关键词
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资金
- U S Department of Energy Office of Science Office of Basic Energy Sciences
- German Research Foundation DFG [DY18/6 1]
- MICINN of Spain [CT2008-00795/BQU, 2010C 07-25200]
- CAM [P PPQ 000225 0505]
- ANSER
Charged polarons in thin films of polymer-fullerene composites are investigated by light-induced electron paramagnetic resonance (EPR) at 9 5 GHz (X-band) and 130 GHz (D-band) The materials studied were poly(3-hexylthiophene) (PHT), [6,6]-phenyl-C61-butyric acid methyl ester (C(60)-PCBM), and two different soluble C(70)-derivates C(70)-PCBM and diphenylmethano[70]fullerene oligoether (C(70)-DPM-OE) The first experimental identification of the negative polaron localized on the C(70)-cage in polymer-fullerene bulk heterojunctions has been obtained When recorded at conventional X-band EPR, this signal is overlapping with the signal of the positive polaron, which does not allow for its direct experimental identification Owing to the superior spectral resolution of the high frequency D-band EPR, we were able to separate light-induced signals from P(+) and P(-) in PHT-C(70) bulk heterojunctions Comparing signals from C(70)-derivatives with different side-chains we have obtained experimental proof that the polaron is localized on the cage of the C(70) molecule
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