Tailoring the mercaptan ligands for high performance inverted perovskite solar cells with efficiency exceeding 21％

• 作者: Shuangjie Wang Ziwei He Jiabao Yang Tongtong Li Xingyu Pu Jian Han Qi Cao Bingyu Gao Xuanhua Li
• 来源期刊: 能源化学
• 年，卷（期）: 2021,（9）
• 页码范围: 169-177
• 页数: 9页
• 语种: 英文

摘要

Interface passivation engineering has been recognized as an effective way to simultaneously contribute to the optoelectronic characteristic and stability of perovskite solar cells(PSCs).Herein,a π-conjugated dual-ligand 1,4-phenylmercaptan(PHMT)is explored to rationally tailor the surface of perovskite film.The experimental and theoretical results show that the PHMT presents planar structure and obvious elec-tron delocalization characteristics,which allow it to anchor on the surface of perovskite with a certain orientation,thereby promoting the transport of interface charge.Moreover,the two sulfhydryl groups in PHMT reduce the trap density of the perovskite film by passivating under-coordinated lead ions.Consequently,the PHMT-modified inverted device based on MAPbI3(MA:methylammonium)achieves enhanced efficiency from 18.11％(control)to 21.11％,along with the ambient stability up to 3500 h.After being placed at 85℃for 500 h or illuminated for 600 h,the modified device remains over 89％or 86％of initial efficiency.This discovery opens a new window for the choice of passivators to improve the performance of PSCs.