卤化胍钝化钙钛矿太阳能电池表面和晶界缺陷的研究

IF 6 3区 工程技术 Q2 ENERGY & FUELS
Solar RRL Pub Date : 2025-06-29 DOI:10.1002/solr.202500319
Kay Thi Soe, Ratchadaporn Supruangnet, Chanan Euaruksakul, Thipusa Wongpinij, Annafi Ado Yaro, Non Thongprong, Ekkaphop Ketsombun, Sanong Kinkasorn, Waranchit Ruengsrisang, Thidarat Supasai, Nopporn Rujisamphan
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引用次数: 0

摘要

胍盐处理为抑制钙钛矿太阳能电池(PSCs)中的离子迁移和稳定晶界提供了一种简单而有效的方法。本研究探讨了卤化胍(GuaX,其中X = I, Br或Cl)表面处理对PSC性能和稳定性的影响,解决了与离子迁移和晶界不稳定性相关的挑战。低能电子显微镜显示,GuaX处理调节了功函数,使其从未处理膜的~5.44 eV降低到guai处理膜的~4.96 eV,这一变化归因于电负性和离子大小的差异。导电原子力显微镜显示改善和均匀的电流分布,特别是在GuaCl处理的薄膜中,由于GuaCl能够减轻表面和晶界缺陷。电流-电压映射强调了GuaCl在稳定晶界电荷输运中的作用。优化后的GuaX处理大大提高了光伏性能,经guac处理的PSCs的功率转换效率为21.10%,开路电压为1.15 V,填充系数为80.16%。表面光电压分析进一步证实了捕获态密度的显著降低(从29-16 meV),而密度泛函数理论计算表明,GuaCl表现出最高的吸附能(- 2.58 eV),表明与钙钛矿有很强的相互作用。此外,环境条件下的稳定性测试显示出卓越的耐久性,经过guacl处理的psc在60天后仍能保持95%以上的初始效率。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Mitigating Surface and Grain Boundary Defects in Perovskite Solar Cells Through Guanidinium Halide Passivation

Mitigating Surface and Grain Boundary Defects in Perovskite Solar Cells Through Guanidinium Halide Passivation

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.

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来源期刊
Solar RRL
Solar RRL Physics 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.
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