Highly efficient perovskite solar cells based on a Zn2SnO4 compact layer

摘要： In the present work, a new reflux condensation route has been developed for synthesizing Zn2SnO4 film, which was first used as a compact layer in a perovskite solar cell (PSC), and achieved an efficiency of 20.1%. The high efficiency of PSC could be contributed to the following: i) As a compact layer in a PSC, Zn2SnO4 exhibits high electron mobility and has an appropriate energy band structure, resulting in the efficient extraction of carriers and transport of electrons; ii) the surface of the FTO substrate is completely covered by a Zn2SnO4 compact layer, and the direct contact between a perovskite layer and FTO is prevented, leading to significantly efficiently suppression of charge recombination. Consequently, the cell consisting of a Zn2SnO4 compact layer exhibits excellent photovoltaic performance.