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.

低温处理的电子传输层对于商用钙钛矿太阳能电池（PSC）至关重要。PC ₆₀ BM / SnO ₂双层电子传输层（ETL）逐渐被报道，但是在SnO ₂上引入PC ₆₀ BM增强机理尚未得到充分研究。在这项工作中，通过溶液法成功制备了低温PC ₆₀ BM / SnO ₂双层ETL。PC ₆₀ BM的引入极大地提高了平面PSC的性能，其原因已得到系统地研究。结果表明PC ₆₀的存在BM可以增强钙钛矿薄膜的晶体质量和晶界整合。合资分析，吸收光谱，光致发光光谱和时间分辨光致发光光谱表明，钙钛矿薄膜的光收集和从钙钛矿薄膜到PC ₆₀ BM / SnO ₂双层的载流子提取都得到了增强。否则，与ITO / SnO ₂衬底或裸ITO衬底相比，ITO / SnO ₂ / PC ₆₀ BM衬底上的钙钛矿薄膜具有更低的陷阱态密度和更高的电子迁移率。所有结果表明低温处理的PC ₆₀ BM / SnO ₂ ETL将有益于PSC的性能，并促进平面PSC的商业应用。