Abstract
The photovoltaic performance of perovskite solar cells (PSCs) largely depends on the crystal grain size of perovskite films. Here, we use the mixture of n-octyltrimethoxysilane (OTES) and aminopropyltrimethoxysilane (APTES) to tailor the surface termination state of SnO2 electron transport layer, and demonstrate the crystal grain size of perovskite is remarkably enlarged. The perovskite film with large crystal size shows a lower non-radical recombination density and a longer charge lifetime. The power conversion efficiency of PSCs is eventually improved from 18.21% to 20.3%. The proposed method may also impact other optoelectronic devices based perovskite films.
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