UV-Durable Fully-Printed Carbon-Based Multi-Porous-Layered-Electrode Perovskite Solar Cells Using SrTiO3 Electron Transport Layer

Abstract

Carbon-based multi-porous-layered-electrode perovskite solar cells (MPLE-PSC) using porous carbon as the back electrode have excellent performance stability against high temperature and high humidity environments at a low cost. However, the stability of MPLE-PSC under ultraviolet light has not improved yet. This is due to the photocatalytic effect of TiO2, which is commonly used as an electron transport layer in MPLE-PSC. In this study, we investigated the relationship between the electron transport material and ultraviolet light stability in MPLE-PSC. MPLE-PSC with TiO2 or SrTiO3 as the electron transport layer were fabricated and photoelectric conversion performance of them were compared. As a result, the performance of solar cells using TiO2 decreased to 80 % of the initial performance after 2 hours of ultraviolet light irradiation. In contrast, no performance degradation was observed in solar cells using SrTiO3. Therefore, the SrTiO3 electron transport layer can be proposed as a solution to improve the ultraviolet light stability of solar cells.