Perovskite solar cells with CuSCN hole extraction layers yield stabilized efficiencies greater than 20%

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Science  28 Sep 2017:
DOI: 10.1126/science.aam5655

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Perovskite solar cells (PSC) with efficiencies >20% have only been realized with highly expensive organic hole-transporting materials. We demonstrate PSCs achieving stabilized efficiencies exceeding 20% with CuSCN as hole extraction layer using fast solvent removal method to create compact, highly conformal CuSCN layers that facilitate fast carrier extraction and collection. The PSCs showed high thermal stability under long term heating, however, their operational stability was poor. This instability originates from potential induced degradation of the CuSCN/Au contact. The addition of a conductive reduced graphene oxide spacer layer between CuSCN and gold allowed PSCs to retain >95% of their initial efficiency after aging at a maximum power point for 1000 hours at 60 Celsius. Importantly, under both continuous full-sun illumination and thermal stress, CuSCN based devices surpassed the stability of spiro-OMeTAD based PSCs.

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