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Self-Assembled Hydrophobic Molecule-Based Surface Modification: A Strategy to Improve Efficiency and Stability of Perovskite Solar Cells
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-06-29 , DOI: 10.1021/acssuschemeng.0c02983 Hongyu Shu 1 , Jianxing Xia 1 , Hua Yang 2 , Junsheng Luo 1 , Zhongquan Wan 1 , Haseeb Ashraf Malik 1 , Fei Han 1 , Xiaojun Yao 3 , Chunyang Jia 1
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-06-29 , DOI: 10.1021/acssuschemeng.0c02983 Hongyu Shu 1 , Jianxing Xia 1 , Hua Yang 2 , Junsheng Luo 1 , Zhongquan Wan 1 , Haseeb Ashraf Malik 1 , Fei Han 1 , Xiaojun Yao 3 , Chunyang Jia 1
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The defects sited on the surface and internal grain boundaries in organic–inorganic hybrid perovskites always capture the carriers and become the recombination centers, causing the decrease in carrier lifetime. Meanwhile, these centers are inclined to become the adsorption sites for water and oxygen, thus leading to the decrease in power conversion efficiency (PCE) and stability of perovskite solar cells (PSCs). Herein, a facile strategy is demonstrated by utilizing a self-assembled ammonium salt named phenyltrimethylammonium bromide (PTABr) to modify perovskite films. This way is efficient to passivate the PbI3– antidefects and enhance the stability under air atmosphere conditions. Experiments and theoretical calculations have demonstrated that self-assembled PTABr shows a hydrophobic aliphatic moiety-on orientation on the surface perovskite, effectively reduces the density of the trap state in perovskite film, and enhances the carrier lifetime. The strategy results in the enhancement of both photovoltaic properties and stability of PSCs; the champion PTABr-treated device shows a PCE over 20% and maintains 86% of its initial PCE after 60 days in ambient atmosphere without encapsulation. This method paves a novel way to improve the surface hydrophobicity and promote the overall properties of the device.
中文翻译：
自组装基于疏水分子的表面改性：提高钙钛矿太阳能电池效率和稳定性的策略
有机-无机杂化钙钛矿中位于表面和内部晶界的缺陷总是会俘获载流子并成为复合中心，从而导致载流子寿命缩短。同时，这些中心倾向于成为水和氧气的吸附点，从而导致功率转换效率（PCE）和钙钛矿太阳能电池（PSC）的稳定性下降。本文中，通过使用称为苯基三甲基溴化铵（PTABr）的自组装铵盐修饰钙钛矿薄膜，可以证明一种简便的策略。这种方法可以有效地钝化PbI 3 –改善空气中的稳定性。实验和理论计算表明，自组装的PTABr在钙钛矿表面上显示疏水性脂肪族部分的取向，可有效降低钙钛矿膜中陷阱态的密度，并延长载流子寿命。该策略可提高光伏性能和PSC的稳定性。冠军的经过PTABr处理的设备显示出超过20％的PCE，并且在周围环境中放置60天后仍保持了其初始PCE的86％，而没有封装。该方法为改善表面疏水性和提高器件的整体性能铺平了道路。
更新日期：2020-07-27
中文翻译：
自组装基于疏水分子的表面改性：提高钙钛矿太阳能电池效率和稳定性的策略
有机-无机杂化钙钛矿中位于表面和内部晶界的缺陷总是会俘获载流子并成为复合中心，从而导致载流子寿命缩短。同时，这些中心倾向于成为水和氧气的吸附点，从而导致功率转换效率（PCE）和钙钛矿太阳能电池（PSC）的稳定性下降。本文中，通过使用称为苯基三甲基溴化铵（PTABr）的自组装铵盐修饰钙钛矿薄膜，可以证明一种简便的策略。这种方法可以有效地钝化PbI 3 –改善空气中的稳定性。实验和理论计算表明，自组装的PTABr在钙钛矿表面上显示疏水性脂肪族部分的取向，可有效降低钙钛矿膜中陷阱态的密度，并延长载流子寿命。该策略可提高光伏性能和PSC的稳定性。冠军的经过PTABr处理的设备显示出超过20％的PCE，并且在周围环境中放置60天后仍保持了其初始PCE的86％，而没有封装。该方法为改善表面疏水性和提高器件的整体性能铺平了道路。
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