Green Material Chlorin e6 Passivation Improves the Efficiency of Perovskite Solar Cells

Functional passivation agents have been shown to effectively optimize the crystallization process and passivate defects on the surface and grain boundaries. People have conducted extensive research on the passivation mechanisms of various passivation agents to obtain more effective passivation agents. Researchers are gradually focusing on natural ingredients in the search for suitable passivation agents due to the wide variety, green colour, and ease of production. As a result, we first combined the natural chlorophyll component chlorin e6 (CE‐6) with perovskite solar cells to improve their performance. Following the incorporation of CE‐6 into the perovskite layer, various functional groups of CE‐6 are used to effectively reduce traps on the perovskite surface, suppress charge recombination at the interface, improve carrier transfer rate and carrier extraction efficiency, and ultimately improve efficiency. The optimal device achieved a power conversion efficiency (PCE) of 21.14% and maintained its initial PCE of 84% after being stored in a room‐temperature air environment for 500 hours. Furthermore, semi‐transparent perovskite solar cells (ST‐PSC) was made with 13.33% PCE, and 5.53% average visible light transmittance (AVT). Our findings show that natural material CE‐6 performs well in the perovskite layer and confirms the promising prospects for optimizing semi‐transparent PSC. This article is protected by copyright. All rights reserved.