Related Experiment Video
Updated: Sep 17, 2025
05:15
Flash Infrared Annealing for Perovskite Solar Cell Processing
Published on: February 3, 2021
8.1K
Suppressing the Precursor Aging for Efficient Formamidinium-Based Dion-Jacobson Two-Dimensional Perovskite Solar
Xianglan Tang1, Yun Lin1, Fang Wan1
1Hunan Key Laboratory of Nanophotonics and Devices, School of Physics, Central South University, Changsha, Hunan 410083, P. R. China.
ACS Nano
|July 1, 2025
Summary
Formamidinium cations in quasi-2D perovskite solar cells react with organic spacers, causing instability. Adding methanesulfonic acid prevents this, improving perovskite solar cell efficiency and stability.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- Quasi-two-dimensional (Q-2D) perovskites with formamidinium cations (FA+) face challenges due to reactions between FA+ and amine-based organic spacers.
- This reaction compromises the phase purity and repeatability of perovskite solar cells (PSCs), a critical issue with limited prior investigation.
Purpose of the Study:
- To investigate the aging process of 1,3-propanediamine- (PDA-) and FA+-based Dion-Jacobson (DJ) type Q-2D perovskite precursors.
- To explore strategies for mitigating FA+-related degradation pathways in Q-2D perovskite systems.
Main Methods:
- Investigated the chemical interactions between formamidinium cations (FA+) and amine-based organic spacers (PDA) in Q-2D perovskite precursors.
- Examined the effect of adding acid, specifically methanesulfonic acid (MSA), on precursor stability and film quality.
- Evaluated the performance of resulting perovskite solar cells (PSCs) through power conversion efficiency (PCE) measurements.
Main Results:
- Identified a reaction where deprotonated PDA forms a ring molecule with FA+, creating an insoluble lead iodide complex and causing reversible precursor aging.
- Demonstrated that adding a small amount of acid, such as MSA, effectively suppresses FA+-related reactions in the precursor.
- Observed that MSA passivates undercoordinated Pb2+ sites, leading to enhanced precursor stability and improved PCE in both PDA- and butylamine (BA)-based Q-2D perovskite films.
- Achieved a significant enhancement in FA-based Q-2D PSC efficiency from 14.60% to 18.26%.
Conclusions:
- The reaction between formamidinium cations and amine-based spacers is a key factor limiting the stability and performance of Q-2D perovskite solar cells.
- Methanesulfonic acid serves as an effective additive to prevent precursor aging and passivate defects, thereby improving the overall efficiency and stability of FA-based Q-2D PSCs.
