Enhancement of short current density in polymer solar cells with phthalocyanine tin (IV) dichloride as interfacial layer |
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Authors: | Lijian Zuo Xiaoxia Jiang Mingsheng Xu Ligong YangYaxiong Nan Quanxiang Yan Hongzheng Chen |
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Affiliation: | a State Key Laboratory of Silicon Materials, MOE Key Laboratory of Macromolecule Synthesis and Functionalization, Zhejiang University, Hangzhou 310027, PR China b Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, PR China c Zhejiang-California International Nanosystems Institute, Zhejiang University, Hangzhou 310027, PR China |
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Abstract: | The effect of n-type phthalocyanine tin (IV) dichloride (SnCl2Pc) as cathode interfacial layer on the performance of poly2-methoxy,5-(2′-ethylhexyloxy)-1,4-phenylene vinylene] (MEH-PPV):6,6]-phenyl-C61-butyric acid methyl ester (PCBM) bulk heterojunction solar cells (ITO/PEDOT:PSS/MEH-PPV:PCBM/SnCl2Pc/LiF/Al) is investigated. Our results show that the integration of SnCl2Pc into the solar cell not only enhances the exciton dissociation efficiency due to the formation of additional MEH-PPV/SnCl2Pc exciton dissociation junction, but also improves the electron transport and collection due to the step-like electron injection barrier to cathode caused by SnCl2Pc interlayer. The incorporation of 6 nm thick SnCl2Pc interlayer leads to 15.7% improvement of the short circuit current density (JSC), which in turn results in 15.2% improvement of power conversion efficiency (η) up to 2.49%. The results suggest that the employment of an n-type organic semiconductor like SnCl2Pc as an interlayer is a promising strategy to improve the device performance of polymer solar cells. |
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Keywords: | Organic solar cell SnCl2Pc Cathode interfacial layer Short circuit current density |
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