Fluorinated graphene quantum dots-induced defect passivation of perovskite film toward stable and efficient perovskite solar cell

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

International Journal of Hydrogen Energy Pub Date : 2025-05-11 DOI:10.1016/j.ijhydene.2025.04.329

Yao Chen , Jiajun Chen , Xiaorui Wang , Penglin Deng , Yijun Shen , Xiaohong Wang

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引用次数: 0

Abstract

Passivation engineering has been considered as an effective strategy to eliminate defects at grain boundaries and interface of perovskite films. Herein, fluorinated graphene quantum dots (FGQDs), as an antisolvent additive, are successfully introduced into perovskite films for defect passivating. FGQDs can regulate the crystallization process of perovskite via chemical bonding with the undercoordinated Pb²⁺. As a result, the high-quality perovskite film with enlarged grain size and reduced defect density can be obtained. FGQDs modified Cs_0.05MA_0.16FA_0.79Pb(I_0.83Br_0.17)₃ device yields a high-power conversion efficiency of 21.74 %, and a higher PCE of 24.12 % is delivered for the device assembled with FA-based perovskite with a composition of Cs_0.05(FA_0.98MA_0.02)_0.95Pb(I_0.98Br_0.02)₃. Due to the excellent hydrophobicity of F atoms, the unencapsulated devices exhibit good long-term stability under 50 % relative humidity condition (85 % efficiency retention after 30 days). Our findings provide a new passivation strategy toward stable and efficient perovskite solar cells.

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氟化石墨烯量子点致钙钛矿膜缺陷钝化制备稳定高效的钙钛矿太阳能电池

钝化工程被认为是消除钙钛矿薄膜晶界和界面缺陷的有效策略。本文成功地将氟化石墨烯量子点（FGQDs）作为抗溶剂添加剂引入到钙钛矿薄膜中进行缺陷钝化。FGQDs可以通过与欠配位Pb2+的化学键合来调节钙钛矿的结晶过程。得到了晶粒尺寸增大、缺陷密度降低的高质量钙钛矿薄膜。FGQDs修饰的Cs0.05 ma0.16 fa0.79 pb (I0.83Br0.17)3器件的功率转换效率高达21.74%，而以Cs0.05(FA0.98MA0.02)0.95Pb(I0.98Br0.02)3为成分的fa基钙钛矿组装的器件的PCE则高达24.12%。由于F原子优异的疏水性，未封装器件在50%相对湿度条件下表现出良好的长期稳定性（30天后效率保持85%）。我们的发现为稳定高效的钙钛矿太阳能电池提供了一种新的钝化策略。

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来源期刊

International Journal of Hydrogen Energy 工程技术-环境科学

CiteScore

13.50

自引率

25.00%

发文量

3502

审稿时长

60 days

期刊介绍： The objective of the International Journal of Hydrogen Energy is to facilitate the exchange of new ideas, technological advancements, and research findings in the field of Hydrogen Energy among scientists and engineers worldwide. This journal showcases original research, both analytical and experimental, covering various aspects of Hydrogen Energy. These include production, storage, transmission, utilization, enabling technologies, environmental impact, economic considerations, and global perspectives on hydrogen and its carriers such as NH3, CH4, alcohols, etc. The utilization aspect encompasses various methods such as thermochemical (combustion), photochemical, electrochemical (fuel cells), and nuclear conversion of hydrogen, hydrogen isotopes, and hydrogen carriers into thermal, mechanical, and electrical energies. The applications of these energies can be found in transportation (including aerospace), industrial, commercial, and residential sectors.