| Summary: | Improving morphological and electronic properties of the electron transport layer (ETL) is a critical issue to fabricate highly efficient perovskite solar cells. Tin dioxide is used as an ETL for its peculiarities such as low-temperature solution-process and high electron mobility and several handlings have been tested to increase its performances. Herein, SnO<sub>2</sub>:ZnO and SnO<sub>2</sub>:In<sub>2</sub>O<sub>3</sub> composites are studied as ETL in planar n-i-p CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub> solar cells fabricated in ambient air, starting from glass/ITO substrates. Morphological, electrical and optical properties of zinc- and indium-oxide nanoparticles (NPs) are investigated. First-principle calculations are also reported and help to further explain the experimental evidences. Photovoltaic performances of full devices show an improvement in efficiency for SnO<sub>2</sub>:In<sub>2</sub>O<sub>3</sub>–based solar cells with respect to pristine SnO<sub>2</sub>, probably due to a suppression of interfacial charge recombination between ITO/ETL and ETL/perovskite. Moreover, a better homogeneity of SnO<sub>2</sub>:In<sub>2</sub>O<sub>3</sub> deposition with respect to SnO<sub>2</sub>:ZnO composites, conducts an increase in perovskite grain size and, consequently, the device performances.
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