乙醇氛围热退火法制备高性能钙钛矿太阳能电池

Alcohol-vapor annealing for high performance perovskite solar cells

采用两步旋涂法制备钙钛矿甲胺碘铅(CH3NH3Pb I3)薄膜,再通过乙醇蒸气氛围热退火的方法处理薄膜.扫描电镜图像、X线衍射谱、紫外可见吸收光谱等表征结果表明,乙醇热氛围退火促进CH3NH3Pb I3晶体的生长,增大晶体尺寸,增强薄膜结晶性.将使用乙醇蒸气热退火方法制备的薄膜组装成太阳能电池,器件短路电流从15.59 m A/cm^2增大到17.17 m A/cm^2,光电转换效率从10.32%提高至11.07%.

CH3NH3PbI3 thin film was fabricated by two-step spin-coating method,and then,the film was treated by alcohol vapor annealing. Scanning electron microscope,X-ray diffraction and UV-Vis absorbance spectrum results demonstrated that alcohol vapor annealing treatment facilitated the growth of CH3NH3PbI3 crystal,increased the grain size and improved the CH3NH3PbI3 film crystallinity. Using this technique of alcohol-vapor annealing,Perovskite solar cells achieve a higher short circuit current density from 15. 59 m A/cm^2 to 17. 17 m A/cm^2 and a higher power conversion efficiency from 10. 32% to 11. 07%.