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Updated: Jun 26, 2025
Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance
Published on: February 27, 2017
Designed Additive to Regulated Crystallization for High Performance Perovskite Solar Cell.
Yang Cao1, Nan Yan1, Mingzi Wang2
1Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education; School of Materials Science and Engineering; Shaanxi Key Laboratory for Advanced Energy Devices; Shaanxi Engineering Lab for Advanced Energy Technology; Institute for Advanced Energy Materials, Shaanxi Normal University, Xi'an, 710119, Shaanxi, China.
Difluoroacetic anhydride (DFA) addition improves perovskite solar cell performance by regulating film crystallization. This leads to high-quality perovskite films with reduced defects, achieving a 25.28% power conversion efficiency and enhanced stability.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- High-quality perovskite films are essential for efficient perovskite solar cells (PSCs).
- Controlling perovskite crystallization is key to reducing film defects and enhancing power conversion efficiency (PCE).
- Additives can regulate crystallization kinetics and improve film morphology.
Purpose of the Study:
- To investigate the use of difluoroacetic anhydride (DFA) as an additive to control perovskite crystallization.
- To reduce defect formation during perovskite film preparation.
- To enhance the power conversion efficiency (PCE) and environmental stability of PSCs.
Main Methods:
- Designed and synthesized difluoroacetic anhydride (DFA) as a crystallization regulator.
- Investigated the reaction mechanism of DFA with DMSO, forming difluoroacetate thioether ester (DTE) and difluoroacetic acid (DA).
- Utilized in situ UV/Vis and photoluminescence (PL) tests to monitor the crystallization process.
- Fabricated perovskite films using DFA additive and characterized their quality and defect density.
Main Results:
- DFA reacted with DMSO to form DTE and DA, which strongly bonded with PbI2.
- These interactions effectively retarded perovskite crystallization, promoting the formation of high-quality films with reduced defects.
- A champion power conversion efficiency (PCE) of 25.28% was achieved for PSCs fabricated with DFA.
- The devices exhibited excellent environmental stability, retaining 95.75% of their initial PCE after 1152 hours under ambient conditions (25°C, 25% RH).
Conclusions:
- Difluoroacetic anhydride (DFA) is an effective additive for controlling perovskite crystallization and reducing defects in perovskite films.
- The use of DFA leads to significant improvements in the power conversion efficiency (PCE) of perovskite solar cells.
- DFA-modified PSCs demonstrate enhanced environmental stability, crucial for practical applications.
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