Bipolaron Formation in Organic Solar Cells Observed by Pulsed Electrically Detected Magnetic Resonance
Bipolaron Formation in Organic Solar Cells Observed by Pulsed Electrically Detected Magnetic Resonance
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DOI：
10.1103/physrevlett.105.176601
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发表时间：
2010-10-19
影响因子：
8.6
通讯作者：
Keeble, D. J.
中科院分区：
文献类型：
--
作者：
Behrends, J.;Schnegg, A.;Keeble, D. J.
我们报告的自旋相关的暗输运电流的观察，表现出在室温下的自旋相干性，在π共轭聚合物-富勒烯共混物使用脉冲电检测磁共振。在g = 2.0028（3）处的共振是由于聚合物中的极化子，并且在高微波场下表现出自旋锁定。过量富勒烯的存在和使用的工作电压（1V）抑制聚合物中负极化子的形成。得出自旋相关输运是由于正双极化子的形成。
We report the observation of a spin-dependent dark transport current, exhibiting spin coherence at room temperature, in a pi-conjugated polymer-fullerene blend using pulsed electrically detected magnetic resonance. The resonance at g = 2.0028(3) is due to polarons in the polymer, and exhibits spin locking at high microwave fields. The presence of an excess of fullerene, and the operating voltage (1 V) used, suppresses negative polaron formation in the polymer. It is concluded that spin-dependent transport is due to the formation of positive bipolarons.