Analyzing photo-induced interfacial charging in IZO/pentacene/C-60/bathocuproine/Al organic solar cells by electric-field-induced optical second-harmonic generation measurement

作者：Chen Xiangyu^*; Taguchi Dai; Manaka Takaaki; Iwamoto Mitsumasa

来源：Journal of Applied Physics, 2012, 111(11): 113711.

DOI：10.1063/1.4728225

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/C-60 and C-60/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 C-60 layers, which significantly suppresses the charge accumulation on the pentacene/C-60 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.

• 出版日期2012-6-1