Although tin oxide (SnO2) has been employed recently as an efficient electron-transporting layer (ETL) to realize highly efficient perovskite solar cells (PVSCs), it is still quite challenging to apply it through facile solution-based synthesis at low enough temperature to be compatible with the roll-to-roll printing on polymer substrates. In this work, a combustion method has been successfully adapted to modulate the exothermic characteristics and processing temperature (150 °C) of SnO2 to achieve homogeneous and crystalline thin film as efficient ETL for PVSCs. The combustion SNO2 ETL shows high electric conductivity, and matched energy level, which leads to a good power conversion efficiency of 13.76%. This newly developed combustion SnO2 has the high potential to provide a facile pathway to fabricate the low temperature processing, roll-to-roll, and high performance PVSCs.
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