Extremely strong room-temperature transient photocurrent-detected magnetic resonance in organic devices
Extremely strong room-temperature transient photocurrent-detected magnetic resonance in organic devices
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DOI：
10.1103/physrevb.86.235442
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发表时间：
2012-12-26
影响因子：
3.7
通讯作者：
Shinar, Joseph
中科院分区：
文献类型：
--
作者：
Chen, Ying;Liu, Rui;Shinar, Joseph
描述了一种极强的室温光电流（PC-或I-PC-）检测磁共振（PCDMR），它阐明了有机器件（特别是太阳能电池）中的传输和捕获现象。当监测氧化铟锡 (ITO)/聚(2-甲氧基-5-(2'-乙基)-己氧基-1,4-亚苯基亚乙烯基) (MEH-PPV)/Al 器件中的瞬态 PCDMR 时，其中 MEH-PPV 膜在 O-2 中于 100 摄氏度下烘烤过夜，观察到 |台达I-PC/I-PC|峰值位于 >> 1 处，其中 Delta I-PC 是磁共振条件引起的 I-PC 变化。重要的是，台达I-PC和I-PC的来源不同。最有可能造成这种效应的机制是与带负电的深陷阱相邻的无自旋双极子的自旋依赖性形成，显然特别是由氧中心诱导形成三重子。 DOI：10.1103/PhysRevB.86.235442
An extremely strong room-temperature photocurrent- (PC- or I-PC-) detected magnetic resonance (PCDMR) that elucidates transport and trapping phenomena in organic devices, in particular solar cells, is described. When monitoring the transient PCDMR in indium tin oxide (ITO)/poly(2-methoxy-5-(2'-ethyl)-hexoxy-1,4-phenylenevinylene) (MEH-PPV)/Al devices, where the MEH-PPV film was baked overnight at 100 degrees C in O-2, it is observed that | Delta I-PC/I-PC| peaks at values >> 1, where Delta I-PC is the change in I-PC induced by magnetic resonance conditions. Importantly, Delta I-PC and I-PC are of different origin. The mechanism most likely responsible for this effect is the spin-dependent formation of spinless bipolarons adjacent to negatively charged deep traps, apparently induced in particular by oxygen centers, to form trions. DOI: 10.1103/PhysRevB.86.235442