Publication date: 15th December 2025
Abstract
Interfacial nanostructuring serves as an effective avenue for augmenting the performance of perovskite solar cells (PSCs) while preserving the intrinsic composition of the perovskite absorber. In this study, "moth-eye" effect-inspired electron transport layers (ETLs) are fabricated by solution-processed colloidal lithography, and we investigated their impacts on the macroscopic device characteristics of perovskite solar cells (PSCs). Various batches of porous SnO₂ ETLs of various hole diameters, ranging from 70 nm to 280 nm, were fabricated atop of a compact ETL layer. In comparison to the planar ETL, the nano-hole-structured SnO2 significantly improve the optical absorptance of the perovskite absorber mainly via a reduction of reflectance. These optical benefits add together on the improved charge extraction due to the increase interfacial contact between ETL and the absorber, leading to improvements on the solar cell efficiency with a clear photocurrent boosting.
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