Structurally Reinforced All‐Inorganic CsPbI2Br Perovskite by Nonionic Polymer via Coordination and Hydrogen Bonds,Solar RRL

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Structurally Reinforced All‐Inorganic CsPbI2Br Perovskite by Nonionic Polymer via Coordination and Hydrogen Bonds
Solar RRL ( IF 6.0 ) Pub Date : 2020-06-11 , DOI: 10.1002/solr.202000216
Huirong Peng ₁ , Molang Cai _{1,

2} , Jiyu Zhou ₃ , Yi Yang ₁ , Xihong Ding ₁ , Ye Tao ₁ , Gao Wu ₁ , Xuepeng Liu ₁ , Jia Hong Pan ₄ , Songyuan Dai _{1,

2}

Affiliation

The all‐inorganic CsPbI₂Br perovskite with superior thermal durability faces challenges of low‐phase stability and high moisture sensitivity. Herein, a nonionic additive of polyethyleneimine (PEI) with multiple amino groups is introduced to form hydrogen bond with I⁻/Br⁻ ions and coordinate with Pb²⁺/Cs⁺ ions simultaneously. The strong interplay between PEI and CsPbI₂Br achieves a well‐controlled grain size, reduced defects, and reinforced phase structure of CsPbI₂Br film, which boosts the power conversion efficiency (PCE) of perovskite solar cells to 15.48%. The hydrophobic long alkyl chain of PEI greatly improves the humidity resistance, retaining 81.9% of initial PCE of zjr unsealed device under 20 ± 5% relative humidity (RH) for 500 h. Remarkably, a PCE of 13.37% is achieved by the device based on CsPbI₂Br–PEI film processed under ambient condition (≈22% RH, ≈25 °C).

中文翻译：

非离子聚合物通过配位和氢键结构增强的全无机CsPbI2Br钙钛矿

具有优异热耐久性的全无机CsPbI ₂ Br钙钛矿面临着低相稳定性和高湿度敏感性的挑战。在本文中，聚乙烯亚胺的具有多个氨基的非离子型添加剂（PEI）被引入以形成氢键与I ^- /溴^-离子和与铅坐标²⁺ / CS ⁺同时离子。PEI和CsPbI ₂ Br之间的强相互作用可实现良好控制的晶粒尺寸，减少缺陷并增强CsPbI _{2 2的}相结构Br膜，将钙钛矿太阳能电池的功率转换效率（PCE）提高到15.48％。PEI的疏水性长烷基链大大提高了耐湿性，在20±5％相对湿度（RH）下，将zjr未密封设备的初始PCE的81.9％保留了500 h。值得注意的是，基于CsPbI ₂ Br–PEI膜的器件在环境条件（约22％RH，约25°C）下加工，其PCE达到了13.37％。

更新日期：2020-06-11

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