Spin Signatures of Photogenerated Radical Anions in Polymer-[70]Fullerene Bulk Heterojunctions High Frequency Pulsed EPR Spectroscopy

被引：70
作者：
Poluektov, Oleg G. [1 ]
Filippone, Salvatore [2 ]
Martin, Nazario [2 ]
Sperlich, Andreas [3 ,4 ]
Deibel, Carsten [3 ,4 ]
Dyakonov, Vladimir [3 ,4 ]
机构：
[1] Argonne Natl Lab, Chem Sci & Engn Div, Argonne, IL 60439 USA
[2] Univ Complutense Madrid, Fac Ciencias Quim, Dept Quim Organ, E-28040 Madrid, Spain
[3] Univ Wurzburg, D-97074 Wurzburg, Germany
[4] Bavarian Ctr Appl Energy Res eV ZAE Bayern, D-97074 Wurzburg, Germany
来源：
JOURNAL OF PHYSICAL CHEMISTRY B | 2010年 / 114卷 / 45期
关键词：
RESONANCE; FULLERENES; EFFICIENT; POLYMER; CELLS; C-70; C-60; PAIR;
D O I：
10.1021/jp1012347
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
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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页码：14426 / 14429
页数：4
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