Nanofiber-modified Electron Transport Layer for Perovskite Solar Cells

Tin dioxide (SnO2) is widely used in perovskite solar cells (PSC) as an electron transport material due to its high transmittance, high electron mobility, good UV stability, and low-temperature processing.However, SnO2 electron transport layer (ETL) prepared from commercial colloidal solution still possesses problems such as easy agglomeration, defects, and energy level mismatch, limiting the performance and stability of the device.This study improved the quality of SnO2 films by introducing a polymer chitin nanofiber (1,2-dibenzoyloxyphenylchitin, DC) into the SnO2 precursor solution, and systematically studied the effect of DC on the precursor solution, film and device performance.Experimental results show that DC additive can effectively inhibit the agglomeration of SnO2 nanoparticles and ensuring a more homogeneous dispersion in the precursor solution.The improved SnO2 film had smaller roughness and could be better wetted by the perovskite solution, which is beneficial to closer contact with the perovskite layer.Simultaneously,