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15 October 2012 Diminishing of S-shaped J-V curves by substrate heating in organic solar cells based on triplet materials
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The S-shaped J-V curves in planar heterojunction organic solar cells (OSCs) using triplet material bis[2-(4- tertbutylphenyl)benzothi azolato-N, C2,] iridium (acetylacetonate) [(t-bt)2Ir(acac)] as donor and C60 as acceptor were diminished by substrate heating during film deposition of (t-bt)2Ir(acac) layer. Mobility measurements showed that the disappearance of S-kinks was attributed to the significant increase of hole mobility in (t-bt)2Ir(acac) by heating the substrate during evaporation and thus the decrease of mobility mismatch between electrons and holes, leading to the improvement of fill factor (FF). Moreover, the photocurrent density (Jph) of heated device was remarkable enhanced and showed decreased space charge limited (SCL) effect due to the balanced charge transport and the increase of charge collection efficiency (ηCC). As a result, by heating the substrate at 70 ℃, a power conversion efficiency (PCE) of 1.63 % was achieved compared to 1.37 % for the unheated device. Using this method, organic solar cells based on triplet materials allow thicker active layer thickness for light absorption without introducing much fill factor loss.
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Lin Hui, Jungsheng Yu, Yue Zang, Jian Zhong, Jiang Quan, and Lei Zhang "Diminishing of S-shaped J-V curves by substrate heating in organic solar cells based on triplet materials", Proc. SPIE 8419, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices for Sensing, Imaging, and Solar Energy, 84190J (15 October 2012);

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