<br>B 位共掺杂结合添加剂钝化将 Pb-Sn 混合无机钙钛矿太阳能电池的效率提高到 17% 以上,Advanced Materials

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B 位共掺杂结合添加剂钝化将 Pb-Sn 混合无机钙钛矿太阳能电池的效率提高到 17% 以上
Advanced Materials ( IF 27.4 ) Pub Date : 2023-12-29 , DOI: 10.1002/adma.202309193
Weihai Zhang _{1,

2} , Heng Liu ₁ , Yating Qu ₃ , Jieshun Cui ₁ , Wenjun Zhang ₂ , Tingting Shi ₃ , Hsing-Lin Wang ₁

Affiliation

铅锡混合无机钙钛矿太阳能电池（PSC）作为减轻混合铅基 PSC 热不稳定性和铅毒性的可行解决方案，引起了越来越多的关注。但结构稳定性较差、器件效率较低阻碍了其进一步发展。在此，通过引入苯异羟肟酸（BHA）作为多功能添加剂，成功开发了高性能锰（Mn）掺杂Pb-Sn-Mn基无机钙钛矿太阳能电池（PSC）。较小的二价锰阳离子的掺入有助于钙钛矿晶体的收缩，从而提高结构稳定性。含有还原性异羟肟酸基团 (O=C–NHOH) 的 BHA 添加剂不仅可以减轻臭名昭著的 Sn ²⁺氧化，而且还可以与 B 位的金属离子相互作用并钝化相关缺陷。这导致薄膜具有高结晶度和低缺陷密度。此外，BHA 分子往往会引入与内置电场平行的近垂直偶极矩，从而有利于电荷载流子的提取。因此，所得器件的 PCE 高达 17.12%，这是迄今为止 Pb-Sn 基无机 PSC 报道的最高效率。此外，BHA 分子提供了钙钛矿晶界的原位封装，从而显着增强了器件的空气稳定性。

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B-Site Co-Doping Coupled with Additive Passivation Pushes the Efficiency of Pb–Sn Mixed Inorganic Perovskite Solar Cells to Over 17%

Pb–Sn mixed inorganic perovskite solar cells (PSCs) have garnered increasing interest as a viable solution to mitigate the thermal instability and lead toxicity of hybrid lead-based PSCs. However, the relatively poor structural stability and low device efficiency hinder its further development. Herein, high-performance manganese (Mn)-doped Pb–Sn–Mn-based inorganic perovskite solar cells (PSCs) are successfully developed by introducing Benzhydroxamic Acid (BHA) as multifunctional additive. The incorporation of smaller divalent Mn cations contributes to a contraction of the perovskite crystal, leading to an improvement in structural stability. The BHA additive containing a reductive hydroxamic acid group (O═C–NHOH) not only mitigates the notorious oxidation of Sn²⁺ but also interacts with metal ions at the B-site and passivates related defects. This results in films with high crystallinity and low defect density. Moreover, the BHA molecules tend to introduce a near-vertical dipole moment that parallels the built-in electric field, thus facilitating charge carrier extraction. Consequently, the resulting device delivers a champion PCE as high as 17.12%, which represents the highest reported efficiency for Pb–Sn-based inorganic PSCs thus far. Furthermore, the BHA molecule provides an in situ encapsulation of the perovskite grain boundary, resulting in significant enhancement of device air stability.

更新日期：2023-12-29

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