Volume 62, Issue 8 e202215799
Research Article

Uncovering Aging Chemistry of Perovskite Precursor Solutions and Anti-aging Mechanism of Additives

Dr. Yanyan Zhang

Dr. Yanyan Zhang

Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Analytical Chemistry for Living Biosystems, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190 China

Search for more papers by this author
Zhi Xing

Zhi Xing

College of Chemistry and Chemical Engineering, Institute of Polymers and Energy Chemistry, Nanchang University, Nanchang, 330031 China

Search for more papers by this author
Baojin Fan

Baojin Fan

College of Chemistry and Chemical Engineering, Institute of Polymers and Energy Chemistry, Nanchang University, Nanchang, 330031 China

Search for more papers by this author
Dr. Zhigang Ni

Corresponding Author

Dr. Zhigang Ni

College of Materials, Chemistry and Chemical Engineering, Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, Hangzhou Normal University, Hangzhou, 311121 China

Search for more papers by this author
Prof. Fuyi Wang

Corresponding Author

Prof. Fuyi Wang

Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Analytical Chemistry for Living Biosystems, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190 China

University of Chinese Academy of Sciences, Beijing, 100049 China

Search for more papers by this author
Prof. Xiaotian Hu

Corresponding Author

Prof. Xiaotian Hu

College of Chemistry and Chemical Engineering, Institute of Polymers and Energy Chemistry, Nanchang University, Nanchang, 330031 China

Search for more papers by this author
Prof. Yiwang Chen

Corresponding Author

Prof. Yiwang Chen

College of Chemistry and Chemical Engineering, Institute of Polymers and Energy Chemistry, Nanchang University, Nanchang, 330031 China

National Engineering Research Center for Carbohydrate Synthesis/Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education, Jiangxi Normal University, Nanchang, 330032 China

Search for more papers by this author
First published: 27 December 2022
Citations: 29

Graphical Abstract

In situ liquid time-of-flight secondary ion mass spectrometry (ToF-SIMS) is established as a molecular probe to unveil the aging chemistry of perovskite precursor solutions. In addition to uncovering the molecular mechanism of chemical aging reactions, it is demonstrated that the structure and stability difference of precursor-additive interactions determines the anti-aging effects of additives.

Abstract

The aging of precursor solutions is the major stumbling block for the commercialization of perovskite solar cells (PSCs). Herein, for the first time we used the state-of-the-art in situ liquid time-of-flight secondary ion mass spectrometry to molecularly explore the perovskite precursor solution chemistry. We identified that the methylammonium and formamidinium cations and the I anion are the motivators of the aging chemistry. Further, we introduced two kinds of Lewis bases, triethyl phosphate (TP) and ethyl ethanesulfonate (EE), as new additives in the solution and unraveled that both of them can protect the reactive cations from aging through weak interactions. Significantly, TP is superior to EE in enhancing long-term solution stability as it can well-maintain the internal interaction structures within the solution phase. The PSC derived from a fresh TP-doped solution delivered a high power conversion efficiency of 23.06 %, 92.23 % of which remained in that from a 21-day-old solution.

Conflict of interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

The full text of this article hosted at iucr.org is unavailable due to technical difficulties.