Photo Stabilization of p‐i‐n Perovskite Solar Cells with Bathocuproine: MXene

• Published in: Small (Weinheim an der Bergstrasse, Germany) Vol. 18; no. 37; pp. e2201730 - n/a
• Main Authors: Yakusheva, Anastasia, Saranin, Danila, Muratov, Dmitry, Gostishchev, Pavel, Pazniak, Hanna, Di Vito, Alessia, Le, Thai Son, Luchnikov, Lev, Vasiliev, Anton, Podgorny, Dmitry, Kuznetsov, Denis, Didenko, Sergey, Di Carlo, Aldo
• Format: Journal Article
• Language: English
• Published: Weinheim Wiley Subscription Services, Inc 01.09.2022; Wiley-VCH Verlag
• Subjects: Charge transfer; Condensed Matter; Energy conversion efficiency; Engineering Sciences; Interlayers; inverted 2D materials; Materials Science; Metal carbides; MXenes; Nanotechnology; Optics; perovskite solar cells; Perovskites; photo stability; Photonic; Photovoltaic cells; Physics; Solar cells; Stabilization; thermal stability; Ti 3C 2T x; Transition metals; Work functions; Two-dimensional materials; Photo stability; Inverted perovskite solar cells; MXenes; Thermal stability
• ISSN: 1613-6810; 1613-6829
• DOI: 10.1002/smll.202201730

Interface engineering is one of the promising strategies for the long‐term stabilization of perovskite solar cells (PSCs), preventing chemical decomposition induced by external agents and promoting fast charge transfer. Recently, MXenes–2D structured transition metal carbides and nitrides with various functionalization (O, ‐F, ‐OH) have demonstrated high potential for mastering the work function in halide perovskite absorbers and have significantly improved the n‐type charge collection in solar cells. This work demonstrates that MXenes allow for efficient stabilization of PSCs besides improving their performances. A mixed composite bathocuproine:MXene, that is, (BCP:MXene) interlayer, is introduced at the interface between an electron‐transport layer (ETL) and a metal cathode in the p‐i‐n device structure. The investigation demonstrates that the use of BCP:MXene interlayer slightly increases the power conversation efficiency (PCE) for PSCs (from 16.5 for reference to 17.5%) but dramatically improves the out of Glove‐Box stability. Under ISOS‐L‐2 light soaking stress at 63 ± 1.5 °C, the T80 (time needed to reduce efficiency down to 80% of the initial one) period increases from 460 to > 2300 hours (h). The method of interface engineering improves photostability of the p‐i‐n perovskite solar cells (PSCs) for > 2400 hours (h). Using small molecule bathocuproine plays a beneficial role in the solution fabrication of the composite interlayers with dispersions of Ti3C2Tx MXenes. The first report is about a significant improvement in the stability of PCSswith MXenes at the interface with the metal electrode.