Low-Temperature Synthesis of SnO2 Nanocrystals as Electron Transport Layers for High-Efficiency CsPbI2Br Perovskite Solar Cells

Abstract

Perovskite solar cells (PSCs) have recently become a hot topic in photovoltaics due to their high power conversion efficiency (PCE) and low-cost processing. As a key component of PSCs, electron transport layers (ETLs) that play a vital role in efficient PSCs generally require high charge extraction ability, mobility, and easy fabrication. Herein, a simple route to obtain dispersion of tin oxide nanocrystals (SnO2 NCs) with uniform diameters and high stability as efficient ETLs for CsPbI2Br solar cells is demonstrated. The champion device achieves a remarkable PCE of 16.22% with an open-circuit voltage of 1.30 V. This work offers a facile and effective way to fabricate high-performance ETL nanocrystals in PSCs.