Enhancing Stability and Efficiency of Inverted Inorganic Perovskite Solar Cells with In-Situ Interfacial Cross-Linked Modifier,Advanced Materials

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Enhancing Stability and Efficiency of Inverted Inorganic Perovskite Solar Cells with In-Situ Interfacial Cross-Linked Modifier
Advanced Materials ( IF 27.4 ) Pub Date : 2024-02-16 , DOI: 10.1002/adma.202312237
Tianfei Xu ₁ , Wanchun Xiang ₁ , Xiaoning Ru _{1,

2} , Zezhang Wang ₁ , Yali Liu ₁ , Nan Li ₁ , Haojie Xu ₁ , Shengzhong Liu _{1,

3}

Affiliation

Inverted inorganic perovskite solar cells (PSCs) is potential as the top cells in tandem configurations, owing to the ideal bandgap, good thermal and light stability of inorganic perovskites. However, challenges such as mismatch of energy levels between charge transport layer and perovskite, significant non-radiative recombination caused by surface defects, and poor water stability have led to the urgent need for further improvement in the performance of inverted inorganic PSCs. Herein, the fabrication of efficient and stable CsPbI_3−xBr_x PSCs through surface treatment of (3-mercaptopropyl) trimethoxysilane (MPTS), is reported. The silane groups in MPTS can in situ crosslink in the presence of moisture to build a 3-dimensional (3D) network by Si-O-Si bonds, which forms a hydrophobic layer on perovskite surface to inhibit water invasion. Additionally, -SH can strongly interact with the undercoordinated Pb²⁺ at the perovskite surface, effectively minimizing interfacial charge recombination. Consequently, the efficiency of the inverted inorganic PSCs improves dramatically from 19.0% to 21.0% under 100 mW cm⁻² illumination with MPTS treatment. Remarkably, perovskite films with crosslinked MPTS exhibit superior stability when soaking in water. The optimized PSC maintains 91% of its initial efficiency after aging 1000 h in ambient atmosphere, and 86% in 800 h of operational stability testing.

中文翻译：

利用原位界面交联改性剂提高倒置无机钙钛矿太阳能电池的稳定性和效率

由于无机钙钛矿具有理想的带隙、良好的热稳定性和光稳定性，倒置无机钙钛矿太阳能电池（PSC）有潜力成为串联结构中的顶级电池。然而，电荷传输层与钙钛矿之间的能级不匹配、表面缺陷引起的显着非辐射复合以及水稳定性差等挑战导致迫切需要进一步提高反相无机PSC的性能。在此，报道了通过（3-巯基丙基）三甲氧基硅烷（MPTS）的表面处理制备高效且稳定的CsPbI _3−x Br _x PSC。 MPTS中的硅烷基团可以在水分存在下原位交联，通过Si-O-Si键构建3维（3D）网络，从而在钙钛矿表面形成疏水层以抑制水的侵入。此外，-SH可以与钙钛矿表面的欠配位Pb ²⁺发生强烈相互作用，有效地减少界面电荷复合。因此，经过MPTS处理，在100 mW cm ^-2光照下，倒置无机PSC的效率从19.0%显着提高到21.0%。值得注意的是，具有交联 MPTS 的钙钛矿薄膜在浸泡在水中时表现出优异的稳定性。优化后的PSC在环境大气中老化1000小时后仍保持其初始效率的91%，在800小时的运行稳定性测试中保持86%。

更新日期：2024-02-16

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