{"title":"Mitigating Surface and Grain Boundary Defects in Perovskite Solar Cells Through Guanidinium Halide Passivation","authors":"Kay Thi Soe, Ratchadaporn Supruangnet, Chanan Euaruksakul, Thipusa Wongpinij, Annafi Ado Yaro, Non Thongprong, Ekkaphop Ketsombun, Sanong Kinkasorn, Waranchit Ruengsrisang, Thidarat Supasai, Nopporn Rujisamphan","doi":"10.1002/solr.202500319","DOIUrl":null,"url":null,"abstract":"<p>Guanidinium salt treatments provide a simple yet effective approach to suppress ion migration and stabilize grain boundaries in perovskite solar cells (PSCs). This study investigates the effects of guanidinium halide (GuaX, where X = I, Br, or Cl) surface treatments on PSC performance and stability, addressing challenges related to ion migration and grain boundary instability. Low-energy electron microscopy reveals that GuaX treatments modulate the work function, reducing it from ~5.44 eV in untreated films to ~4.96 eV in GuaI-treated films, a change attributed to differences in electronegativity and ionic size. Conductive atomic force microscopy demonstrates improved and uniformed current distribution, particularly in GuaCl-treated films, owing to GuaCl's ability to mitigate surface and grain boundary defects. Current–voltage mapping highlights GuaCl's role in stabilizing charge transport at grain boundaries. Optimized GuaX treatments substantially enhance photovoltaic performance, with GuaCl-treated PSCs achieving a power conversion efficiency of 21.10%, an open-circuit voltage of 1.15 V, and a fill factor of 80.16%. Surface photovoltage analysis further confirms a significant reduction in trap-state density (from 29–16 meV), while density functional theory calculations indicate that GuaCl exhibits the highest adsorption energy (−2.58 eV), indicating strong interaction with the perovskite. Moreover, stability tests under ambient conditions demonstrate exceptional durability, with GuaCl-treated PSCs retaining over 95% of their initial efficiency after 60 days.</p>","PeriodicalId":230,"journal":{"name":"Solar RRL","volume":"9 16","pages":""},"PeriodicalIF":6.0000,"publicationDate":"2025-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Solar RRL","FirstCategoryId":"5","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1002/solr.202500319","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
Guanidinium salt treatments provide a simple yet effective approach to suppress ion migration and stabilize grain boundaries in perovskite solar cells (PSCs). This study investigates the effects of guanidinium halide (GuaX, where X = I, Br, or Cl) surface treatments on PSC performance and stability, addressing challenges related to ion migration and grain boundary instability. Low-energy electron microscopy reveals that GuaX treatments modulate the work function, reducing it from ~5.44 eV in untreated films to ~4.96 eV in GuaI-treated films, a change attributed to differences in electronegativity and ionic size. Conductive atomic force microscopy demonstrates improved and uniformed current distribution, particularly in GuaCl-treated films, owing to GuaCl's ability to mitigate surface and grain boundary defects. Current–voltage mapping highlights GuaCl's role in stabilizing charge transport at grain boundaries. Optimized GuaX treatments substantially enhance photovoltaic performance, with GuaCl-treated PSCs achieving a power conversion efficiency of 21.10%, an open-circuit voltage of 1.15 V, and a fill factor of 80.16%. Surface photovoltage analysis further confirms a significant reduction in trap-state density (from 29–16 meV), while density functional theory calculations indicate that GuaCl exhibits the highest adsorption energy (−2.58 eV), indicating strong interaction with the perovskite. Moreover, stability tests under ambient conditions demonstrate exceptional durability, with GuaCl-treated PSCs retaining over 95% of their initial efficiency after 60 days.
Solar RRLPhysics and Astronomy-Atomic and Molecular Physics, and Optics
CiteScore
12.10
自引率
6.30%
发文量
460
期刊介绍:
Solar RRL, formerly known as Rapid Research Letters, has evolved to embrace a broader and more encompassing format. We publish Research Articles and Reviews covering all facets of solar energy conversion. This includes, but is not limited to, photovoltaics and solar cells (both established and emerging systems), as well as the development, characterization, and optimization of materials and devices. Additionally, we cover topics such as photovoltaic modules and systems, their installation and deployment, photocatalysis, solar fuels, photothermal and photoelectrochemical solar energy conversion, energy distribution, grid issues, and other relevant aspects. Join us in exploring the latest advancements in solar energy conversion research.