Cheng Rui, Chung Chih-Chun, Zhang Hong, Zhou Zhiwen, Zhai Peng, Huang Yu-Ting, Lee Hyeonseok, Feng Shien-Ping
Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong.
Department of Electrical and Electronic Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong.
Small. 2019 Feb;15(8):e1804465. doi: 10.1002/smll.201804465. Epub 2019 Jan 28.
The photovoltaic performance of perovskite solar cells is highly dependent on the control of morphology and crystallization of perovskite film, which usually requires a controlled atmosphere. Therefore, fully ambient fabrication is a desired technology for the development of perovskite solar cells toward real production. Here, an air-knife assisted recrystallization method is reported, based on a simple bath-immersion to prepare high-quality perovskite absorbers. The resulted film shows a strong crystallinity with pure domains and low trap-state density, which contribute to the device performance and stability. The proposed method can operate in a wide process window, such as variable relative humidity and bath-immersion conditions, demonstrating a power conversion efficiency over 19% and 27% under 1 sun and 500-2000 lux dim-light illumination respectively, which is among the highest performance of ambient-process perovskite solar cells.
钙钛矿太阳能电池的光伏性能高度依赖于对钙钛矿薄膜形态和结晶的控制，这通常需要可控气氛。因此，全环境制备是钙钛矿太阳能电池朝着实际生产发展所需的技术。在此，报道了一种气刀辅助再结晶方法，该方法基于简单的浴浸法来制备高质量的钙钛矿吸收层。所得薄膜具有很强的结晶度，具有纯畴和低陷阱态密度，这有助于提高器件性能和稳定性。所提出的方法可以在较宽的工艺窗口内运行，如可变的相对湿度和浴浸条件，在1个太阳光照和500 - 2000勒克斯弱光照明下分别展示出超过19%和27%的功率转换效率，这是环境工艺钙钛矿太阳能电池的最高性能之一。
