Hydrophilic or Hydrophobic? Spontaneous Chemical Capping with Bis(trifluoromethanesulfonyl)imide-Based Additive for Photoabsorbers in Perovskite Solar Cells

IF 6 3区 工程技术 Q2 ENERGY & FUELS
Solar RRL Pub Date : 2025-08-31 DOI:10.1002/solr.202500433
Naoyuki Nishimura, Ryuzi Katoh, Hiroyuki Kanda, Takurou N. Murakami
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Abstract

Salts based on bis(trifluoromethanesulfonyl)imide (TFSI) have been developed as additives for photoabsorbers in perovskite solar cells (PSCs) to enhance their photovoltaic (PV) performance. However, the effects of their TFSI anions have remained elusive. Herein, a novel methylammonium bis(trifluoromethanesulfonyl)imide (MA-TFSI) additive, comprising MA cations that are removed from the perovskite layer during heating, is verified. This is the first implementation of alkyl-primary-ammonium-based TFSI additives for perovskite layers. MA-TFSI addition exhibited unique chemical capping effects; the TFSI moieties were spontaneously coated on the outer surface of the perovskite and on the crystal grains during deposition, leading to the prevention of defect formation in the perovskite layer. Notably, the TFSI-capped perovskite surface displays high wettability to water droplets yet improved PV performance stability against humidity, contradicting the school of thought in the PSC research field. Parameter-differentiated contact angle (PDCA) measurements suggest that the high wettability of water droplets is attributed to the active hydrogen bonds derived from the TFSI capping. Meanwhile, the improved stability against humidity is attributable to the low dispersion energy of the CF3 moiety in the TFSI capping on the crystal grains. The presented deviation from the prevailing viewpoint will lead to the advancement of materials science.

Abstract Image

亲水性还是疏水性?钙钛矿太阳能电池光吸收剂用双(三氟甲烷磺酰)亚胺基添加剂的自发化学封盖
基于双(三氟甲烷磺酰)亚胺(TFSI)的盐已被开发作为钙钛矿太阳能电池(PSCs)的光吸收剂添加剂,以提高其光伏(PV)性能。然而,它们的TFSI阴离子的影响仍然难以捉摸。本文验证了一种新型的二(三氟甲烷磺酰)亚胺甲基铵(MA- tfsi)添加剂,其包含在加热过程中从钙钛矿层中去除的MA阳离子。这是第一次在钙钛矿层中使用烷基伯胺基TFSI添加剂。MA-TFSI的加入表现出独特的化学封盖效应;在沉积过程中,TFSI基团自发地涂覆在钙钛矿的外表面和晶粒上,从而防止了钙钛矿层中缺陷的形成。值得注意的是,tfsi覆盖的钙钛矿表面对水滴具有很高的润湿性,但却提高了PV对湿度的性能稳定性,这与PSC研究领域的思想流派相矛盾。参数分化接触角(PDCA)测量表明,水滴的高润湿性归因于TFSI封盖产生的活性氢键。同时,晶体抗湿稳定性的提高是由于晶体上TFSI盖层中CF3部分的色散能量较低。当前对流行观点的偏离将导致材料科学的进步。
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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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