Surface Treatment via a Multifluorine-Containing Passivator for High-Performance Inorganic Perovskite Solar Cells

IF 5.4 3区 材料科学 Q2 CHEMISTRY, PHYSICAL
Panli Zhang, Zezhang Wang, Tianfei Xu, Nan Li, Shengzhong Liu, Wanchun Xiang* and Xing Zhang*, 
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Abstract

Metal-halide inorganic perovskites have gained great interest due to their excellent thermal stability and adjustable bandgaps for fabricating tandem solar cells. However, challenges such as significant nonradiative recombination by perovskite interfacial defects and unpleasant moisture stability have forced further improvements in the power conversion efficiency (PCE) and stability of inverted inorganic perovskite solar cells (PSCs). Herein, 3,5-bis(trifluoromethyl)benzylamine (TFBA) as a surface modifier was used to achieve these goals. It was found that the amino group in TFBA can provide electrons to coordinate with the undercoordinated Pb2+ on the surface of inorganic perovskite, thus mitigating surface defects. Moreover, TFBA contains two trifluoromethyl groups with hydrophobic properties, which can effectively prevent moisture from intrusion. Consequently, TFBA treatment resulted in remarkable improvement of the device open-circuit voltage by 110 mV, leading to a PCE of 20.4% under 100 mW cm–2 illumination, superior to that of the control cell (17.8%). The unencapsulated devices without treatment and treatment with TFBA can preserve their initial PCEs of 65 and 90%, respectively, after aging for 1150 h under ambient conditions.

Abstract Image

高性能无机钙钛矿太阳能电池的多氟钝化剂表面处理
金属卤化物无机钙钛矿由于其优异的热稳定性和可调节的带隙而引起了人们的极大兴趣,用于制造串联太阳能电池。然而,诸如钙钛矿界面缺陷引起的显著非辐射复合和令人不快的水分稳定性等挑战,迫使倒转无机钙钛矿太阳能电池(PSCs)的功率转换效率(PCE)和稳定性进一步提高。本文采用3,5-二(三氟甲基)苄胺(TFBA)作为表面改性剂来实现这些目标。研究发现,TFBA中的氨基可以提供电子与无机钙钛矿表面未配位的Pb2+配位,从而减轻表面缺陷。此外,TFBA含有两个具有疏水性的三氟甲基,可以有效地防止水分的侵入。因此,TFBA处理使器件开路电压显著提高了110 mV,在100 mW cm-2照明下,PCE为20.4%,优于对照电池(17.8%)。未封装器件未经处理和经TFBA处理后,在环境条件下老化1150 h后,其初始pce分别保持65%和90%。
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来源期刊
ACS Applied Energy Materials
ACS Applied Energy Materials Materials Science-Materials Chemistry
CiteScore
10.30
自引率
6.20%
发文量
1368
期刊介绍: ACS Applied Energy Materials is an interdisciplinary journal publishing original research covering all aspects of materials, engineering, chemistry, physics and biology relevant to energy conversion and storage. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important energy applications.
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阿拉丁
Nickel(II) nitrate hexahydrate
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3,5-Bis(trifluoromethyl)benzylamine (TFBA)
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