14 October 2016 High-performance integrated perovskite and organic solar cells with efficient near-infrared harvesting
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The integration of planar-type perovskite (Eg ~ 1.5 eV) solar cells (PSCs) with a bulk-heterojunction (BHJ) composite comprising a near-infrared (NIR) absorbing conjugated polymer (Eg < 1.4 eV) and a fullerene derivative is a promising approach to overcoming the narrow absorption limit of typical PSCs. Nevertheless, integrated solar cells (ISCs) suffer from low fill factors (FFs) and inefficient NIR harvesting, mainly due to poor charge transport in the BHJ films. Here, we successfully demonstrate highly efficient P-I-N perovskite/BHJ ISCs with an enhanced FF and improved NIR harvesting by introducing a novel n-type semiconducting polymer and a new processing additive into the BHJ films. The optimized ISCs exhibit a power conversion efficiency (PCE) of 16.36%, which far surpasses that of the reference PSCs (~ 14.70%) due to the increased current density (Jsc ~ 20.04 mA cm-2) resulting from the additional NIR harvesting. Meanwhile, the optimized ISCs maintain a high FF of 77% and an open-circuit voltage (Voc) of 1.06 V. These results indicate that this approach is a versatile means of overcoming the absorption and theoretical efficiency limits of state-ofthe- art PSCs.
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Junghwan Kim, Junghwan Kim, Kwanghee Lee, Kwanghee Lee, } "High-performance integrated perovskite and organic solar cells with efficient near-infrared harvesting", Proc. SPIE 9942, Organic Photovoltaics XVII, 994203 (14 October 2016); doi: 10.1117/12.2240755; https://doi.org/10.1117/12.2240755

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