{"title":"Dual-Functional Guanidinium Iodide Interfacial Engineering for Efficient and Stable Dion–Jacobson Perovskite Solar Cells","authors":"Jingwei Mao, , , Yufeng Liu, , , Ying Ding, , , Jiawen Song, , , Zhengzong Lu, , , Lifeng Piao, , , Zhenlin Wu, , , Yefu Liu, , and , Yi Wei*, ","doi":"10.1021/acs.energyfuels.5c02540","DOIUrl":null,"url":null,"abstract":"<p >Perovskite solar cells (PSCs) have achieved over 27% efficiency in just a decade, yet their long-term stability remains a commercialization bottleneck. Quasi-two-dimensional (quasi-2D) perovskites, particularly Dion–Jacobson (DJ) phases, have garnered significant attention due to their superior environmental stability compared with three-dimensional (3D) counterparts. Despite this, quasi-2D PSCs still lag behind in efficiency owing to intrinsic defects at grain boundaries and interfaces; these defects also facilitate moisture ingress and accelerate degradation. To address these limitations, this work introduces a stable DJ-phase perovskite based on 1,4-cyclohexanedimethanamine (CDMA) and employs guanidinium iodide (GUAI) as an interfacial modifier. The multifunctional GUAI layer synergistically passivates cation vacancies, heals deep-level defects, and smooths grain boundaries through interactions between its electron-rich guanidinium groups and iodide ions. This dual-action strategy enhances charge extraction, suppresses nonradiative recombination, and strengthens moisture resistance. Consequently, GUAI-modified 2D PSCs achieve a champion PCE of 15.07% (vs 13.25% for control devices) with an open-circuit voltage of 1.09 V and fill factor of 70.68%. Remarkably, the unencapsulated device retains 92% of its initial PCE after 2500 h in ambient air (35–75% RH), demonstrating exceptional operational stability. This work provides a scalable approach to enhance the efficiency and stability in perovskite photovoltaics.</p>","PeriodicalId":35,"journal":{"name":"Energy & Fuels","volume":"39 40","pages":"19444–19450"},"PeriodicalIF":5.3000,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Energy & Fuels","FirstCategoryId":"5","ListUrlMain":"https://pubs.acs.org/doi/10.1021/acs.energyfuels.5c02540","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENERGY & FUELS","Score":null,"Total":0}
引用次数: 0
Abstract
Perovskite solar cells (PSCs) have achieved over 27% efficiency in just a decade, yet their long-term stability remains a commercialization bottleneck. Quasi-two-dimensional (quasi-2D) perovskites, particularly Dion–Jacobson (DJ) phases, have garnered significant attention due to their superior environmental stability compared with three-dimensional (3D) counterparts. Despite this, quasi-2D PSCs still lag behind in efficiency owing to intrinsic defects at grain boundaries and interfaces; these defects also facilitate moisture ingress and accelerate degradation. To address these limitations, this work introduces a stable DJ-phase perovskite based on 1,4-cyclohexanedimethanamine (CDMA) and employs guanidinium iodide (GUAI) as an interfacial modifier. The multifunctional GUAI layer synergistically passivates cation vacancies, heals deep-level defects, and smooths grain boundaries through interactions between its electron-rich guanidinium groups and iodide ions. This dual-action strategy enhances charge extraction, suppresses nonradiative recombination, and strengthens moisture resistance. Consequently, GUAI-modified 2D PSCs achieve a champion PCE of 15.07% (vs 13.25% for control devices) with an open-circuit voltage of 1.09 V and fill factor of 70.68%. Remarkably, the unencapsulated device retains 92% of its initial PCE after 2500 h in ambient air (35–75% RH), demonstrating exceptional operational stability. This work provides a scalable approach to enhance the efficiency and stability in perovskite photovoltaics.
期刊介绍:
Energy & Fuels publishes reports of research in the technical area defined by the intersection of the disciplines of chemistry and chemical engineering and the application domain of non-nuclear energy and fuels. This includes research directed at the formation of, exploration for, and production of fossil fuels and biomass; the properties and structure or molecular composition of both raw fuels and refined products; the chemistry involved in the processing and utilization of fuels; fuel cells and their applications; and the analytical and instrumental techniques used in investigations of the foregoing areas.