Room-temperature synthesized SnO2 electron transport layers for efficient perovskite solar cells

摘要

Tin oxide (SnO _(2) ) is widely used as electron transport layer (ETL) material in perovskite solar cells (PSCs). Numerous synthesis methods for SnO _(2) have been reported, but they all require a proper thermal treatment for the SnO _(2) ETLs. Herein we present a simple method to synthesize SnO _(2) nanoparticles (NPs) at room temperature. By using butyl acetate as a precipitator and a proper UV–Ozone treatment to remove Cl residuals, excellent SnO _(2) ETLs were obtained without any thermal annealing. The highest power conversion efficiency (PCE) of the prepared PSCs was 19.22% for reverse scan (RS) and 18.79% for forward scan (FS). Furthermore, flexible PSCs were fabricated with high PCEs of 15.27%/14.74% (RS/FS). The low energy consuming SnO _(2) ETLs therefore show great promise for the flexible PSCs' commercialization.