Abstract
Abstract The low temperature-processed electron transport layers are crucial to the commercial perovskite solar cells (PSCs). PC60BM/SnO2 bilayer electron transport layer (ETL) has gradually been reported, but the mechanism of enhancement by the introducing PC60BM on SnO2 is not fully understudied. In this work, low temperature PC60BM/SnO2 bilayer ETLs are successfully prepared via a solution process. The introduction of PC60BM dramatically enhances the performance of the planar PSCs, and the reason has been systemically investigated. The results show that the existence of PC60BM could enhance the crystalline quality and grain boundary integration in perovskite films. The J-V analysis, absorption spectra, photoluminescence spectra and time-resolved photoluminescence spectra show that both the light harvesting of perovskite films and carrier extraction from perovskite films to PC60BM/SnO2 bilayer have been enhanced. Otherwise, perovskite films on ITO/SnO2/PC60BM substrate have a lower trap state density and higher electron mobility than those of ITO/SnO2 substrate or bare ITO substrate. All the results suggest that low temperature-processed PC60BM/SnO2 ETLs will benefit the performance of PSCs and promote the commercial application of planar PSCs.
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