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DMF as an Additive in a Two-Step Spin-Coating Method for 20% Conversion Efficiency in Perovskite Solar Cells
Jionghua Wu1,2, Xin Xu1,2, Yanhong Zhao1,2
1Key Laboratory for Renewable Energy (CAS), Beijing Key Laboratory for New Energy Materials and Devices, Institute of Physics, Chinese Academy of Sciences , Beijing 100190, China.
Adding dimethylformamide (DMF) to perovskite precursor solutions improves film quality and charge transfer. This method yields high-performance perovskite solar cells with efficiencies up to 20.1%.
Area of Science:
- Materials Science
- Chemical Engineering
- Renewable Energy
Background:
- High-quality perovskite films are crucial for efficient solar cells.
- Controlling perovskite crystallization is key to improving performance and stability.
- Existing methods often face challenges in achieving defect-free films.
Purpose of the Study:
- To investigate the role of dimethylformamide (DMF) in preparing high-quality perovskite films.
- To optimize a multicycle spin-coating method for perovskite film deposition.
- To understand the nucleation and crystallization mechanisms of perovskite films with DMF additive.
Main Methods:
- Utilized a two-step multicycle spin-coating method with DMF additive in the precursor solution.
- Formulated precursor solutions using formamidinium iodide (FAI), methylammonium iodide (MAI), and isopropanol (IPA).
- Optimized DMF concentration and spin-coating cycles to achieve desired film morphology.
Main Results:
- DMF addition facilitated perovskite conversion, improved film morphology, and reduced crystal defects.
- Compact, pinhole-free perovskite films (FAxMA1-xPbI2.55Br0.45) were obtained.
- Achieved a peak power conversion efficiency (PCE) of 20.1% and a steady-state PCE of 19.1%.
Conclusions:
- DMF additive plays a critical role in forming an amorphous phase, promoting complete perovskite conversion.
- The optimized multicycle spin-coating method with DMF offers a repeatable route to high-performance perovskite solar cells (PSCs).
- This study provides insights into perovskite crystallization processes, aiding future material development.
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