Fluorene-based low band-gap copolymers for high performance photovoltaic devices

Qingmei Zhou, B.; Qiong Hou; Liping Zheng, B.; Xianyu Deng, B.; Gang Yu; Yong Cao
March 2004
Applied Physics Letters;3/8/2004, Vol. 84 Issue 10, p1653
Academic Journal
Low band-gap, soluble conjugated copolymers were synthesized from 9,9-dioctylfluorene and 4,7-di-2-thienyl-2,1,3-benzothiadiazole (PFO-DBT) and different composition ratios were used for the donor material in bulk heterojunction polymer photovoltaic cells (PVCs). In PVCs made with PFO-DBT:PCBM (methano-fullerene [6,6]-phenyl C61-butyric acid methyl ester) blends, the spectral response is extended up to 650 nm and the open-circuit voltage (V[sub oc]) is improved to 0.95 V. The energy conversion efficiency (η[sub e]) in devices with optimized composition reaches 2.24% under an AM1.5 solar simulator (78.2 mW/cm[sup 2]). In contrast to organic PVCs previously published, these PVCs retain high energy conversion efficiency at illumination up to 5 suns of AM1.5 spectral illumination. This feature allows high efficiency polymer PVC modules made in combination with a light concentrator. © 2004 American Institute of Physics.


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