摘要
为了改进空气环境条件下有机无机钙钛矿薄膜的制备工艺,开发了一种间歇式退火(intermittent annealing,IA)方法,以制备高质量无针孔的钙钛矿薄膜,优化光电性能.采用扫描电子显微镜(scanning electron microscope,SEM)、X射线衍射谱(X-ray diffraction,XRD)、紫外可见吸收(ultraviolet-visible,UV-Vis)光谱、光致发光(photoluminescence,PL)光谱等表征,系统比较了在空气环境条件下反溶剂一步法旋涂制备钙钛矿薄膜工艺中,普通退火(traditional annealing,TA)方法和间歇式退火方法处理得到的卤化铅甲胺有机钙钛矿薄膜的形貌、结构和光电性能.结果表明,对于MAPbI_3、MAPbIBr_2和MAPbI_2Br钙钛矿材料,采用间歇式退火方法制备的薄膜均匀致密无针孔,晶粒尺寸显著增大,薄膜结晶性提高,在可见光范围内光吸收能力更强.在空气环境下所得间歇式退火制备的MAPbI_3太阳能电池器件在AM 1. 5的模拟太阳光下,光电转换效率可达11. 5%(有效面积0. 24 cm^2),而在空气环境下以普通退火方法制备的器件的光电转换效率为8. 9%,间歇式退火样品的光电转换效率有大幅度提高.
An intermittent annealing(IA)method for the preparation of pinhole-free highly uniform and well-crystallized perovskite films was developed.The morphology,structure,optical,and electrical properties of perovskite films treated by the traditional annealing(TA)method and the intermittent annealing method were compared.All of the films were prepared by one-step spin-coating method with ethyl acetate as an anti-solvent under ambient conditions.The effects of the annealing methods on perovskite films were characterized by scanning electron microscope(SEM),X-ray diffraction(XRD),ultraviolet-visible(UV-Vis)spectroscopy and photoluminescence(PL)spectroscopy.Films treated by the traditional annealing method tend to exhibit weak ultraviolet-visible absorption,while the intermittent annealing method was beneficial for preparing highly uniform perovskite films with larger grain size.The method was applicable to MAPbI3 and Br-doped perovskite materials.The best device treated by the intermittent method in ambient condition shows an power conversion efficiency of 11.5%under simulated AM 1.5 irradiation,which is a 30%enhancement in comparison with that of 8.9%for the device treated by the traditional annealing method.
作者
韩晓东
王凯文
严铮洸
黄杰
杨凯祥
彭博
HAN Xiaodong;WANG Kaiwen;YAN Zhengguang;HUANG Jie;YANG Kaixiang;PENG Bo(Institute of Microstructure and Properties of Advanced Materials,Beijing University of Technology,Beijing 100124,China;Beijing Key Laboratory of Microstructure and Property of Solids,Beijing University of Technology,Beijing 100124,China)
出处
《北京工业大学学报》
CAS
CSCD
北大核心
2019年第4期395-404,共10页
Journal of Beijing University of Technology
基金
国家自然科学基金资助项目(11674015
1L102001201401)
北京市自然科学基金资助项目(2172005)
关键词
电子显微学
光电性能
太阳能电池
有机卤化铅钙钛矿
薄膜制备
退火
electron microscopy
opto-electronic properties
solar cell
organic lead halide perovskite
thin film preparation
annealing
