反溶剂两步法制备TiO_2/CH_3NH_3PbI_3钙钛矿太阳能电池

Antisolvent-assisted preparation of lead iodide perovskite films for TiO_2/CH_3NH_3PbI_3 heterojunction solar cells

一种基于钙钛矿结构碘铅甲胺薄膜太阳能电池由于成本低、光电效率高而成为研究热点.本文介绍一种反溶剂两步法制备平整均一钙钛矿薄膜太阳能电池的新工艺,即在旋涂碘化铅的N,N-二甲基甲酰胺(DMF)溶液时立刻滴加反溶剂氯苯,从而促进结晶.对器件和薄膜的分析显示该技术在旋涂时改变了钙钛矿成核和晶体生长动力学,其有利于制备出平整均一的钙钛矿薄膜.利用该方法制备的固态介孔结构太阳能电池,其效率达到了12.081%(在标准太阳光条件下测试),且电池的工艺重复性明显提升.

Thin-film photovoltaics based on alkylammonium lead iodide perovskite light absorbers have recently emerged as a promising low-cost solar energy harvesting technology. The flat uniform thin films we reported can be deposited by a two-step,solvent-induced,fast crystallization method,involving spin-coating of a DMF solution of PbI_2 and immediately adding chlorobenzene to induce crystallization. Analysis of the devices and films revealed that the solution processing technique has changed the kinetics of nucleation and crystal growth of the perovskite during the spin coating producing uniform perovskite thin films. Using this technique for the fabrication of solid-state mesoscopic solar cells greatly increases the reproducibility of their performance and allows us to achieve a power conversion efficiency of 12. 081%( measured under standard AM1. 5G test conditions).