An effective way to improve the power conversion efficiency of organic solar cells is to use a tandem architecture consisting of two subcells, so that a broader part of the solar spectrum can be used and the thermalization loss of photon energy can be minimized1. For a tandem cell to work well, it is important for the subcells to have complementary absorption characteristics and generate high and balanced (matched) currents. This requires a rather challenging effort to design and select suitable active materials for use in the subcells. Here, we report a high-performance solution-processed, tandem solar cell based on the small molecules DR3TSBDT and DPPEZnP-TBO, which offer efficient, complementary absorption when used as electron donor materials in the front and rear subcells, respectively. Optimized devices achieve a power conversion efficiency of 12.50% (verified 12.70%), which represents a new level of capability for solution-processed, organic solar cells.
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The authors acknowledge financial support from MoST (2014CB643502, 2016YFA0200200), NSFC (51373078, 51422304, 91433101, 51323003, 51473053) and the International Science and Technology Cooperation Program of China (2013DFG52740).
The authors declare no competing financial interests.
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Li, M., Gao, K., Wan, X. et al. Solution-processed organic tandem solar cells with power conversion efficiencies >12%. Nature Photon 11, 85–90 (2017). https://doi.org/10.1038/nphoton.2016.240
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