<br>表面锚定氟化磺酸盐可实现高效稳定的钙钛矿光伏发电,Journal of Materials Chemistry C

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表面锚定氟化磺酸盐可实现高效稳定的钙钛矿光伏发电
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2024-05-29 , DOI: 10.1039/d4tc01479k
Bo Yang _{1,

2} , Xinyue Li ₃ , Bing Cai ₃ , Xiaojia Zheng _{1,

2} , Kai Xiong ₃ , Wen-Hua Zhang ₃

Affiliation

溶液处理的钙钛矿薄膜中的缺陷会捕获光生载流子，促进离子迁移并加速钙钛矿的降解，从而对钙钛矿太阳能电池（PSC）的性能构成重大威胁。为了解决这些问题，我们合理地提出了一种多功能锍盐分子，即二苯基-(三氟甲基)-锍三氟甲磺酸盐(TFS-TFMS)，旨在使用经济高效的后处理方法螯合钙钛矿薄膜的有害缺陷。理论和实验证据表明，钙钛矿薄膜表面和晶界上的缺陷，包括不配位的 Pb ²⁺ 、挥发性有机阳离子和移动离子空位，由 S

O 协同锚定， TFS-TFMS 分子中的 –CF ₃ 和 TFS ⁺ 基团分别通过路易斯酸碱配位、氢键和静电相互作用。钙钛矿和空穴传输层之间界面的载流子动力学行为和能级排列也得到显着改善。因此，引入 TFS-TFMS 后，PSC 的功率转换效率 (PCE) 从 21.99% 提高到 23.56%，并且磁滞指数降低。此外，未经封装的TFS-TFMS改良器件在40-60%相对湿度（1752小时）或85℃加热（504小时）的老化条件下分别可以保留其初始PCE的86%和80%。预计这种富氟锍盐分子的协同设计策略可以激发更多潜在的多功能调节剂，使高效稳定的PSC在未来实现商业化。

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Surface-anchoring fluorinated sulfonate enables efficient and stable perovskite photovoltaics

Defects in solution-processed perovskite films can trap photoinduced carriers, facilitate ion migration, and accelerate degradation of perovskites, thus posing a major threat to the performance of perovskite solar cells (PSCs). To address these issues, we rationally proposed a multifunctional sulfonium salt molecule, namely diphenyl-(trifluoromethyl)-sulfonium trifluoromethanesulfonate (TFS-TFMS), which was designed to chelate the detrimental defects of perovskite films using a cost-effective post-treatment method. Theoretical and experimental evidence indicated that defects on the surface and grain boundaries of perovskite films, including uncoordinated Pb²⁺, volatile organic cations and mobile ionic vacancies, were synergistically anchored by S [double bond, length as m-dash]

O, –CF₃ and TFS⁺ groups in the TFS-TFMS molecule via Lewis acid–base coordination, hydrogen bonds and electrostatic interactions, respectively. The carrier dynamic behavior and energy level alignment at the interface between perovskites and hole-transportation-layers were also significantly improved. Consequently, the power conversion efficiency (PCE) of PSCs was boosted from 21.99% to 23.56% upon the introduction of TFS-TFMS, along with a diminished hysteresis index. In addition, the TFS-TFMS modified devices without encapsulation can retain 86% and 80% of their initial PCEs under aging conditions of 40–60% relative humidity (1752 h) or heating at 85 °C (504 h), respectively. It is expected that this synergistical design strategy of fluorine-rich sulfonium salt molecules can inspire more potential multifunctional modulators for efficient and stable PSCs towards commercialization in the future.

更新日期：2024-05-30

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