Enhancements in device efficiency of poly(3-hexylthiophene): [6,6]-phenyl C61-butyric acid methyl ester based solar cells with incorporation of bathocuproine |
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| Authors: | Wei-Hsuan TsengMei-Hsin Chen Ching-Chun ChangWei-Hsiang Lin Li-Chyong ChenKuei-Hsien Chen Chih-I Wu |
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| Affiliation: | a Graduate Institute of Photonics and Optoelectronics, National Taiwan University, Taipei 106, Taiwanb Department of Opto-Electronic Engineering, National Dong Hwa University, Hualien 974, Taiwanc Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 106, Taiwand Institute of Physics, Academia Sinica, Taipei 115, Taiwane Center for Condensed Matter Science, National Taiwan University, Taipei 106, Taiwan |
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| Abstract: | The overall enhancement of poly(3-hexylthiophene): 6,6]-phenyl C61-butyric acid methyl ester based organic solar cell with a thin layer of bathocuproine (BCP) inserted between active layers and aluminum (Al) cathodes was investigated. X-ray and ultraviolet photoemission spectroscopy show that no reaction occurs at the active layer/BCP interface and 2 nm of BCP could effectively suppress the chemical reactions between Al and active layers. Atomic force microscope images also indicate that BCP layers can provide smoother contact surfaces with Al cathodes and suppress the generation of shunt leakage, resulting in larger Voc and better power conversion efficiency of devices. |
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| Keywords: | Organic solar cell Photoemission Interface |
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