The interfaces between the absorber and charge transport layers are shown to be critical for the performance of perovskite solar cells (PSCs). PSCs based on the Spiro-OMeTAD hole transport layers generally suffer from the problems of stability and reproducibility. Inorganic hole transport materials CuCrO 2 have good chemical stability and high hole mobility. Herein, we reported the preparation of the delafossite-type CuCrO 2 nanocrystals with a template-etching-calcination method and the incorporation of the as-obtained CuCrO 2 nanocrystals at the perovskite/ Spiro-OMeTAD interfaces of planar PSCs to improve the device efficiency and stability. Compared with the traditional hydrothermal method, the template-etchingcalcination method used less calcination time to prepare CuCrO 2 nanocrystals. After the CuCrO 2 interface modification, the efficiency of PSCs improved from 18.08% to 20.66%. Additionally, the CuCrO 2 -modified PSCs showed good stability by retaining nearly 90% of the initial PCE after being stored in a drybox for 30 days. The template-etching-calcination strategy will pave a new approach for the synthesis of high-performance inorganic hole-transporting materials.
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