Correlation between Interfacial Structures and Device Performance: The Double‐Edged Sword Effect of Lead Iodide in Perovskite Solar Cells

Author:

Tian Bingchu1,Shang Yanbo2,Tu Yi1,Hu Jun1,Han Dong1,Xu Qian1,Yang Shangfeng2ORCID,Ye Yifan1ORCID,Ding Honghe1,Li Yu1,Zhu Junfa1ORCID

Affiliation:

1. National Synchrotron Radiation Laboratory Department of Chemical Physics University of Science and Technology of China 230029 Hefei China

2. Hefei National Laboratory for Physical Sciences at Microscale CAS Key Laboratory of Materials for Energy Conversion Department of Materials Science and Engineering Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of China 230026 Hefei China

Abstract

AbstractThe interfacial electronic structure of perovskite layers and transport layers is critical for the performance and stability of perovskite solar cells (PSCs). The device performance of PSCs can generally be improved by adding a slight excess of lead iodide (PbI2) to the precursor solution. However, its underlying working mechanism is controversial. Here, we performed a comprehensive study of the electronic structures at the interface between CH3NH3PbI3 and C60 with and without the modification of PbI2 using in situ photoemission spectroscopy measurements. The correlation between the interfacial structures and the device performance was explored based on performance and stability tests. We found that there is an interfacial dipole reversal, and the downward band bending is larger at the CH3NH3PbI3/C60 interface with the modification of PbI2 as compared to that without PbI2. Therefore, PSCs with PbI2 modification exhibit faster charge carrier transport and slower carrier recombination. Nevertheless, the modification of PbI2 undermines the device stability due to aggravated iodide migration. Our findings provide a fundamental understanding of the CH3NH3PbI3/C60 interfacial structure from the perspective of the atomic layer and insight into the double‐edged sword effect of PbI2 as an additive.

Funder

National Natural Science Foundation of China

Casualty Actuarial Society

Publisher

Wiley

Subject

Physical and Theoretical Chemistry,Atomic and Molecular Physics, and Optics

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3