A MINI REVIEW ON ELECTRON TRANSPORT LAYERS (ETLS) FOR PEROVSKITE SOLAR CELLS

Abstract

Perovskite solar cells (PSCs) have demonstrated rapid increased in efficiency and advanced in photovoltaic technology in the last decade. Ideally, the absorber layer in PSCs is sandwiched between highly conductive electron transport layer (ETL) and highly stable hole transport layer (HTL). The presence of these two layers has a significant impact on the performance of PSCs. This paper will review the common materials used for ETL, various deposition techniques to grow ETL, their advantages and disadvantages, recent advances of TiO₂ films as an ETL including their challenges and future perspective. In this context, TiO₂ nanostructure due to their low cost, non-toxicity, and ease of manufacture, have been found to be the most prominent photocatalyst choices. Finally, this review show how doped TiO₂ can be a beneficial approach to improve the PSC’s performance and stability.