Yuan Binbin, Zhao Suling, Xu Zheng, Song Dandan, Qiao Bo, Li Yang, Qin Zilun, Meng Juan, Xu Xurong
Key Laboratory of Luminescence and Optical Information (Beijing Jiaotong University), Ministry of Education Beijing 100044 China
Institute of Optoelectronics Technology, Beijing Jiaotong University Beijing 100044 China.
RSC Adv. 2018 Mar 23;8(21):11574-11579. doi: 10.1039/c7ra13289a. eCollection 2018 Mar 21.
The grain size of perovskite films is a key factor to optimize the performance of perovskite photovoltaic devices. Herein, a new route is developed in this paper to prepare CHNHPbI (MAPbI) films with a better morphology and crystallization. This method includes the spin coating deposition of perovskite films with a precursor solution of PbI and CHNHI at the molar ratio 1 : 1 and thermal annealing (TA). The thermal annealing is conducted with a thermal-induced process to realize grain growth with solvent evaporation. In addition, a mixed solvent vapor treatment in acetic acid with chlorobenzene (HAc/CB) improves the morphology and crystallization of films further. As a result, the photovoltaic device based on the perovskite film treated by mixed HAc/CB solvent exhibits the best efficiency of 13.15% in comparison to the control device with 11.44% under AM 1.5G irradiation (100 mW cm).
钙钛矿薄膜的晶粒尺寸是优化钙钛矿光伏器件性能的关键因素。本文开发了一种新方法来制备具有更好形貌和结晶性的CHNHPbI（MAPbI）薄膜。该方法包括用摩尔比为1:1的PbI和CHNHI前驱体溶液旋涂沉积钙钛矿薄膜以及热退火（TA）。热退火通过热诱导过程进行，以随着溶剂蒸发实现晶粒生长。此外，在乙酸与氯苯（HAc/CB）中进行混合溶剂蒸汽处理可进一步改善薄膜的形貌和结晶性。结果，与在AM 1.5G辐照（100 mW/cm²）下效率为11.44%的对照器件相比，基于经HAc/CB混合溶剂处理的钙钛矿薄膜的光伏器件表现出13.15%的最佳效率。
