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SnO 2 has been the most commonly used electron transport layer (ETL) in perovskite solar cells (PSCs) due to its excellent electron mobility and stability. To meet the applications of SnO 2 ETL in large-scale solar cells, a rapid but inexpensive synthesis of high-quality SnO 2 film is urgently needed. Herein, SnO 2 quantum dots (QDs) were synthesized through a super rapid (∼3 min), additive-free microwave-assisted reaction. Comparing with the crystalized SnO 2 films, the small-sized SnO 2 QDs present improved electronic properties, including the Fermi level, conductivity, electron mobility, and trap density. Hence, with this SnO 2 ETL, the power conversion efficiency of the PSCs reached 20.24% using a CH 3 NH 3 PbI 3 absorber, which is among the highest values in the same rank. Overall, these results demonstrate a bright future for the facile microwave-assisted synthesis of SnO 2 QDs along with their application for highly flexible and efficient PSCs.