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13 September 2012 Enhanced sensitivity to near-infrared with high fill factor in small molecular organic solar cells
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Abstract
High efficiency near-infrared (NIR) absorbing solar cells based on lead phthalocyanine (PbPc) are reported using copper iodide (CuI) as a templating layer to control the crystal structure of PbPc. Devices with CuI inserted between the ITO and PbPc layers exhibit a two times enhancement of the JSC compared to the case in the absence of the CuI layer. This is due to the increase of crystallinity in the molecules grown on the CuI templating layer, which is investigated via an x-ray diffraction study. Moreover, fill factor is also enhanced to 0.63 from 0.57 due to low series resistance although the additional CuI layer is inserted between the ITO and the PbPc layer. As a result, the corrected power conversion efficiency of 2.5% was obtained, which is the highest one reported up to now among the PbPc based solar cells.
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Hyun-Sub Shim, Hyo Jung Kim, Ji Whan Kim, Sei-Yong Kim, Won-Ik Jeong, Tae-Min Kim, and Jang-Joo Kim "Enhanced sensitivity to near-infrared with high fill factor in small molecular organic solar cells", Proc. SPIE 8477, Organic Photovoltaics XIII, 84771M (13 September 2012); https://doi.org/10.1117/12.930244
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