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15 October 2012 Charge carrier losses of organic solar cells based on subphthalocyanine/C60 heterojunction
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Abstract
Charge carrier losses of organic solar cells (OSCs) based on Subphthalocyanine (SubPc)/C60 heterojunction have been studied through the measurements of incident light intensity dependent response of the device. The light intensity was varied between 0.03 and 100 mW/cm2. The results showed that short circuit current density follows a linear dependence on light intensity (Pin), while open circuit voltage logarithmically increase with Pin with a slop of 120 mV/decade, indicating that the charge carrier losses are governed by trap-assisted recombination through interface states between donor and acceptor, with an estimated trap density of order 1024 m-3. Moreover, the inverse dependence of shunt resistance (RPA) on light intensity reveals that charge carriers are trapped in the bulk of active layer as well as at the organic/electrode interface, resulting in the decrease of fill factor (FF) with Pin.
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Yue Zang, Jungsheng Yu, Jiang Huang, and Yadong Jiang "Charge carrier losses of organic solar cells based on subphthalocyanine/C60 heterojunction", Proc. SPIE 8419, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices for Sensing, Imaging, and Solar Energy, 84193I (15 October 2012); https://doi.org/10.1117/12.977837
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