Indolo[3,2-b]carbazole-Based Self-Assembled Monolayer Enables High-Performance Inverted Perovskite Solar Cells with Over 25.5% Efficiency

Open AccessCCS ChemistryRESEARCH ARTICLES15 Oct 2024Indolo[3,2-b]carbazole-Based Self-Assembled Monolayer Enables High-Performance Inverted Perovskite Solar Cells with Over 25.5% Efficiency Zhong-Rui Lan, Dian-Xue Ma, Kun Tang, Jiannian Yao, Jiang-Yang Shao and Yu-Wu Zhong Zhong-Rui Lan , Dian-Xue Ma , Kun Tang , Jiannian Yao , Jiang-Yang Shao and Yu-Wu Zhong https://doi.org/10.31635/ccschem.024.202404647 SectionsSupplemental MaterialAboutPDF ToolsAdd to favoritesDownload CitationsTrack Citations ShareFacebookTwitterLinked InEmail Although the power conversion efficiency (PCE) of perovskite solar cells (PSCs) has already reached 26.1%, the interfacial non-radiative recombination losses still limit their development. Self-assembled monolayers (SAMs) as promising hole-selective layers (HSLs) in inverted PSCs enable lossless contacts and minimize interfacial recombination. The development of SAMs based on new functional groups is still in urgent demand. Here we present a novel indolo[3,2-b]carbazole-based SAM with an ethylphosphonic acid anchor, namely 2PICz, as HSL in inverted PSCs. The use of indolo[3,2-b]carbazole group distinctly improves the surface wettability of the film, which is beneficial for forming high-coverage perovskite films. Besides, 2PICz shows a favorable energy level alignment with perovskite and reduces the trap density of perovskite film. As a result, PSC employing 2PICz shows a PCE of 25.51% (25.28% certified) with an open-circuit voltage of 1.18 V and good storage stability that maintains 98% PCE in a nitrogen atmosphere for 3000 h and over 87% PCE after heating at 65 °C for 2000 h. In addition, a 1-square centimeter cell shows a PCE of 24.17%. The insights obtained from this study will drive the development of novel SAMs for high-performance solar cells. Download figure Download PowerPoint Previous articleNext article FiguresReferencesRelatedDetails Issue AssignmentNot Yet AssignedSupporting Information Copyright & Permissions© 2024 Chinese Chemical Society Downloaded 0 times PDF downloadLoading ...