Frontiers Science Center for Flexible Electronics, Institute of Flexible Electronics (IFE), Northwestern Polytechnical University (NPU), Xi'an, 710072, P. R. China.
Shenzhen Key Laboratory of Ultraintense Laser and Advanced Material Technology, Center for Advanced Material Diagnostic Technology, and College of EngineeringPhysics, Shenzhen Technology University (SZTU), Lantian Road 3002, Shenzhen, 518118, China.
Adv Sci (Weinh). 2023 Jan;10(3):e2205342. doi: 10.1002/advs.202205342. Epub 2022 Dec 1.
Organic-inorganic perovskite solar cells (PSCs) have achieved great attention due to their expressive power conversion efficiency (PCE) up to 25.7%. To improve the photovoltaic performance of PSCs, interface engineering between the perovskite and hole transport layer (HTL) is a widely used strategy. Following this concept, benzyl trimethyl ammonium chlorides (BTACls) are used to modify the wet chemical processed perovskite film in this work. The BTACl-induced low dimensional perovskite is found to have a bilayer structure, which efficiently decreases the trap density and improves the energy level alignment at the perovskite/HTL interface. As a result, the BTACl-modified PSCs show an improved PCE compared to the control devices. From device modeling, the reduced charge carrier recombination and promoted charge carrier transfer at the perovskite/HTL interface are the cause of the open-circuit (V ) and fill factor (FF) improvement, respectively. This study gives a deep understanding for surface modification of perovskite films from a perspective of the morphology and the function of enhancing photovoltaic performance.
有机-无机钙钛矿太阳能电池（PSCs）因其高达 25.7%的能量转换效率（PCE）而受到极大关注。为了提高 PSCs 的光伏性能，钙钛矿和空穴传输层（HTL）之间的界面工程是一种广泛使用的策略。基于这一概念，本工作采用苄基三甲基氯化铵（BTACls）来修饰湿法处理的钙钛矿薄膜。BTACl 诱导的低维钙钛矿具有双层结构，有效地降低了陷阱密度，并改善了钙钛矿/HTL 界面的能级排列。结果，BTACl 修饰的 PSCs 与对照器件相比，显示出更高的 PCE。从器件建模来看，载流子复合的减少和载流子在钙钛矿/HTL 界面的转移促进分别是开路电压（V ）和填充因子（FF）提高的原因。本研究从形貌和增强光伏性能的功能的角度，深入了解了钙钛矿薄膜的表面修饰。
