Analyzing photo-induced interfacial charging in IZO/pentacene/C60/bathocuproine/Al organic solar cells by electric-field-induced optical second-harmonic generation measurement
Analyzing photo-induced interfacial charging in IZO/pentacene/C60/bathocuproine/Al organic solar cells by electric-field-induced optical second-harmonic generation measurement
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DOI：
10.1063/1.4728225
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发表时间：
2012-06
影响因子：
3.2
通讯作者：
Xiangyu Chen;D. Taguchi;T. Manaka;M. Iwamoto
中科院分区：
文献类型：
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作者：
Xiangyu Chen;D. Taguchi;T. Manaka;M. Iwamoto
利用电场诱导光学二次谐波(EFISHG)测量方法，研究了在有机太阳能电池(OSCs)中的界面载流子行为。结果表明，Maxwell-Wagner超额电荷在并五苯/C60和C60/BCP界面上均有积累。同时，BCP层的引入增强了OSCs中光载流子的产生，导致并五苯和C60层的电导率增加，从而显著抑制了并五苯/C60界面上的电荷积累。在Maxwell-Wagner效应模型的基础上，考虑了有源有机OSC层的介电性质，讨论了BCP阻挡层的作用。
By using electric-field-induced optical second-harmonic generation (EFISHG) measurement, we investigated interfacial carrier behavior in organic solar cells (OSCs) with a blocking layer of bathocuproine (BCP). Results evidently showed that the Maxwell-Wagner type excess charges accumulate on both pentacene/C60 and C60/BCP interfaces. Meanwhile, the introduction of BCP layer enhances photocarrier generation in the OSCs and results in the increase of the conductivity of the pentacene and C60 layers, which significantly suppresses the charge accumulation on the pentacene/C60 interface. The role of the BCP blocking layer was discussed with taking into account the dielectric nature of the active organic OSC layer on the basis of the Maxwell-Wagner effect model.