High-Efficiency Perovskite Solar Cells with Imidazolium-Based Ionic Liquid for Surface Passivation and Charge Transport

被引：259

作者：

Zhu, Xuejie ^{[1
]}

Du, Minyong ^{[2
]}

Feng, Jiangshan ^{[1
]}

Wang, Hui ^{[2
]}

Xu, Zhuo ^{[1
]}

Wang, Likun ^{[2
]}

Zuo, Shengnan ^{[1
]}

Wang, Chenyu ^{[1
]}

Wang, Ziyu ^{[2
]}

Zhang, Cong ^{[1
]}

Ren, Xiaodong ^{[1
]}

Priya, Shashank ^{[3
]}

Yang, Dong ^{[3
]}

Liu, Shengzhong ^{[1
,2
]}

机构：

[1] Shaanxi Normal Univ, Key Lab Appl Surface & Colloid Chem, Shaanxi Engn Lab Adv Energy Technol, Minist Educ,Sch Mat Sci & Engn, Xian 710119, Peoples R China

[2] Chinese Acad Sci, Dalian Natl Lab Clean Energy, Dalian Inst Chem Phys, iChEM, 457 Zhongshan Rd, Dalian 116023, Peoples R China

[3] Penn State Univ, Mat Sci & Engn, University Pk, PA 16802 USA

来源：

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2021年 / 60卷 / 08期

基金：

中国国家自然科学基金;

关键词：

energy levels; ionic liquids; passivation; perovskites; stability;

D O I：

10.1002/anie.202010987

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Surface defects have been a key constraint for perovskite photovoltaics. Herein, 1,3-dimethyl-3-imidazolium hexafluorophosphate (DMIMPF6) ionic liquid (IL) is adopted to passivate the surface of a formamidinium-cesium lead iodide perovskite (Cs(0.08)FA(0.92)PbI(3)) and also reduce the energy barrier between the perovskite and hole transport layer. Theoretical simulations and experimental results demonstrate that Pb-cluster and Pb-I antisite defects can be effectively passivated by [DMIM](+) bonding with the Pb2+ ion on the perovskite surface, leading to significantly suppressed non-radiative recombination. As a result, the solar cell efficiency was increased to 23.25 % from 21.09 %. Meanwhile, the DMIMPF6-treated perovskite device demonstrated long-term stability because the hydrophobic DMIMPF6 layer blocked moisture permeation.

引用

页码：4238 / 4244

页数：7

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