研究目的
To investigate the effect of sodium sulfate (Na2SO4) passivation layer on the interface defects and charge transfer in perovskite solar cells (PSCs).
研究成果
The introduction of Na2SO4 between the TiO2 ETL and perovskite layer by spin-coating is a simple and effective method to passivate interface, boosting the quality of perovskite film and charge transport. With the presence of a small amount of Na2SO4, the defects and traps at the ETL/perovskite interface become fewer. Additionally, the perovskite film achieves larger grain size, better crystallinity, and lower defect (trap) density. Hence, Na2SO4 can be used to reduce the carrier recombination and promote the charge transport, which have been clearly proved in the work.
研究不足
The study focuses on the effect of Na2SO4 passivation on the TiO2/perovskite interface and does not explore other interfaces or materials extensively. The concentration range of Na2SO4 solution was limited, and higher concentrations were not investigated for potential negative effects.
