Effects of cathode buffer layers on the efficiency of bulk-heterojunction solar cells

Ching-Chun Chang; Chi-Feng Lin; Jian-Ming Chiou; Tzung-Han Ho; Yen Tai; Jiun-Haw Lee; Yang-Fang Chen; Juen-Kai Wang; Li-Chyong Chen; Kuei-Hsien Chen
June 2010
Applied Physics Letters;6/28/2010, Vol. 96 Issue 26, p263506
Academic Journal
The effects of cathode buffer layers on the bulk-heterojunction solar cells are investigated. Comparing with the device without buffer layer, obvious enhancements of Voc from 0.38 to 0.65 V and fill factor from 44% to 63% have been achieved by using 2 nm bathocuproine layer, which make the efficiency of the devices improved from 1.63% to 4.11%. Alternatively, lithium fluoride and/or tris(8-hydroxyquinolinato) aluminum were also introduced for clarification purpose. X-ray photoelectron spectroscopy study indicates that the degradation caused by the outer diffusion of carbon from active layers plays a crucial role in the device performance.


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