High-conductivity thiocyanate ionic liquid interface engineering for efficient and stable perovskite solar cells

Shumao Wang; Haodan Guo; Jinpeng Wu; Yan Lei; Xiangrong Li; Yanyan Fang; Yuhua Dai; Wanchun Xiang; Yuan Lin

doi:10.1039/d2cc02354g

High-conductivity thiocyanate ionic liquid interface engineering for efficient and stable perovskite solar cells

Chem Commun (Camb). 2022 Jul 26;58(60):8384-8387. doi: 10.1039/d2cc02354g.

Authors

Shumao Wang^{1

2}, Haodan Guo^{2

3}, Jinpeng Wu^{2

3}, Yan Lei^{2

3}, Xiangrong Li^{2

3}, Yanyan Fang^{2

3}, Yuhua Dai¹, Wanchun Xiang⁴, Yuan Lin^{2

3}

Affiliations

¹ College of New Materials and Chemical Engineering, Beijing Institute of Petrochemical Technology, Beijing, 102617, China. daiyuhua@bipt.edu.cn.
² Beijing National Laboratory for Molecular Sciences, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Science, Beijing, 100190, China. fyy001@iccas.ac.cn.
³ University of Chinese Academy of Sciences, Beijing, 100049, China.
⁴ Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, Shaanxi Key Laboratory for Advanced Energy Devices, Shaanxi Engineering Lab for Advanced Energy Technology, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an, 710119, China. wanchun.xiang@snnu.edu.cn.

PMID: 35792136
DOI: 10.1039/d2cc02354g

Abstract

A high-conductivity thiocyanate ionic liquid (EMIMSCN) was introduced into perovskite solar cells for the first time. The high conductivity of EMIMSCN ensures an adequate supply of free SCN^- anions and EMIM⁺ cations, so as to multifunctionally passivate the I vacancy and Pb-I antisite defects and realize an optimized interfacial energy level. Consequently, the devices with EMIMSCN treatment achieve a high PCE of 22.55% with substantial enhancement in stability. This simple and efficient strategy provides new insights into the selection of passivation agents for efficient and stable PSCs.