Surface Engineering of Perovskite Films via Sequential Moisture Cooling and Passivation for Efficient Solar Cells

IF 19 1区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY Advanced Functional Materials Pub Date : 2025-01-16 DOI:10.1002/adfm.202420084
Can Wang, Zeping Ou, Yi Pan, Nabonswende Aida Nadege Ouedraogo, Peidong Chen, Qin Gao, Ke Yang, Hongliang Lei, Yunfei Ouyang, Wei Wan, Mingyang Gao, Zhiwei Wu, Deyong Peng, Tingming Jiang, Kuan Sun
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Abstract

Defect density on the perovskite film surface significantly exceeds that found in the bulk, primarily due to the presence of dangling bonds and excessive strain. Herein, a synergistic surface engineering is reported aimed at reducing surface defects of perovskite films. This method involves subjecting the thermally-annealed perovskite films to a controlled cooling condition involving an ambient environment with regulated humidity, as opposed to a nitrogen environment, followed by phenethylammonium iodide (PEAI) passivation. The perovskite films treated with moisture cooling (MC) exhibit enhanced radiative recombination, prolonged charge carrier lifetime, and improved hole transport and extraction when in contact with the hole transport layer (HTL), alongside a significant reduction in strain. Notably, the passivation effect of PEAI on the MC-treated perovskite films is significantly amplified compared with the films subjected to nitrogen cooling (NC) treatment, as evidenced by a more uniform surface potential mapping and a markedly extended charge carrier lifetime. This enhanced passivation effect may arise from the higher ratio of newly-formed 2D perovskite phase PEA2FAPb2I7 to PEA2PbI4 in the MC-treated film. Consequently, the MC-based perovskite solar cell (PSC) achieves a champion power conversion efficiency (PCE) of 25.28%, surpassing that of the NC-treated device, which exhibits a PCE of only 24.01%.

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高效太阳能电池中连续湿冷却和钝化钙钛矿膜的表面工程
主要由于悬挂键和过度应变的存在,过氧化物薄膜表面的缺陷密度大大超过了块体表面的缺陷密度。本文报告了一种协同表面工程方法,旨在减少透辉石薄膜的表面缺陷。这种方法包括将热退火的过氧化物薄膜置于湿度可调的环境(而不是氮气环境)中进行受控冷却,然后进行苯乙基碘化铵(PEAI)钝化。经过湿冷(MC)处理的珍珠岩薄膜在与空穴传输层(HTL)接触时,辐射重组增强、电荷载流子寿命延长、空穴传输和萃取改善,同时应变显著降低。值得注意的是,与经过氮冷却(NC)处理的薄膜相比,PEAI 对 MC 处理过的包晶石薄膜的钝化效果明显增强,这表现在表面电位图更均匀,电荷载流子寿命明显延长。这种钝化效果的增强可能是由于 MC 处理过的薄膜中新形成的二维包晶相 PEA2FAPb2I7 与 PEA2PbI4 的比例更高。因此,基于 MC 的包晶太阳能电池 (PSC) 实现了 25.28% 的冠军功率转换效率 (PCE),超过了经 NC 处理的器件,后者的 PCE 仅为 24.01%。
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来源期刊
Advanced Functional Materials
Advanced Functional Materials 工程技术-材料科学:综合
CiteScore
29.50
自引率
4.20%
发文量
2086
审稿时长
2.1 months
期刊介绍: Firmly established as a top-tier materials science journal, Advanced Functional Materials reports breakthrough research in all aspects of materials science, including nanotechnology, chemistry, physics, and biology every week. Advanced Functional Materials is known for its rapid and fair peer review, quality content, and high impact, making it the first choice of the international materials science community.
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