The solution processing of pinhole‐free methylammonium lead triiodide perovskite–C70 fullerene (MAPbI3:C70) blend films on fluorine‐doped tin oxide (FTO)‐coated glass substrates is presented. Based on this approach, a simplified and robust protocol for the preparation of efficient electron‐transport layer (ETL)‐free perovskite solar cells is described. Power conversion efficiency (PCE) of 13.6 % under AM 1.5 G simulated sunlight is demonstrated for these devices. Comparative impedance spectroscopy and photostability analysis of the MAPbI3:C70 and single MAPbI3 films compared with conventional compact TiO2 ETL‐based devices are shown. The beneficial impact of using MAPbI3:C70 blend films is emphasized.
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Pascual et al. (2016) studied this question.
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