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Published on: July 16, 2018
Dual-Action Sulfonium-Amino Acid Additive Enabling Crystallization Regulation and Defect Passivation for
Long Chen1, Yongming Ma1, Qian Yue1
1Michael Grätzel Center For Mesoscopic Solar Cells, Wuhan National Laboratory For Optoelectronics, Key Laboratory of Materials Chemistry For Energy Conversion and Storage of Ministry of Education, Huazhong University of Science and Technology, Wuhan, Hubei, China.
DL-methionine-S-methyl sulfonium chloride (DMSC) enhances perovskite solar cell quality. This dual-action additive improves crystallization and defect passivation, boosting efficiency and stability in printable mesoscopic perovskite solar cells (p-MPSCs).
Area of Science:
- Materials Science
- Renewable Energy
- Nanotechnology
Background:
- Solution-processed halide perovskite films often suffer from poor crystallinity and defects, limiting device performance.
- Defects and grain boundaries in perovskite layers hinder charge transport and reduce solar cell efficiency.
- Developing strategies for high-quality perovskite films is crucial for advancing solar cell technology.
Purpose of the Study:
- To introduce DL-methionine-S-methyl sulfonium chloride (DMSC) as a dual-action additive for improving perovskite crystallization and defect passivation.
- To enhance the performance and stability of hole-conductor-free, printable mesoscopic perovskite solar cells (p-MPSCs).
- To investigate the mechanism by which DMSC improves perovskite film quality and device characteristics.
Main Methods:
- DMSC was incorporated as an additive into the perovskite precursor solution.
- The effect of DMSC on perovskite crystallization, film morphology, and defect density was analyzed.
- Fabrication and characterization of hole-conductor-free, printable mesoscopic perovskite solar cells (p-MPSCs) with DMSC were performed.
- Device performance (efficiency, stability) was evaluated under operational conditions.
Main Results:
- DMSC addition led to refined colloidal particle size, controlled nucleation, and enhanced perovskite crystallinity.
- DMSC effectively passivated defect sites, suppressing non-radiative recombination and improving stability.
- Perovskite solar cells (p-MPSCs) with DMSC achieved a champion power conversion efficiency of 22.5%, compared to 20.6% for control devices.
- Encapsulated DMSC-based p-MPSCs retained 95% of their initial efficiency after 1000 hours of continuous illumination and aging.
Conclusions:
- DMSC serves as an effective dual-action additive for high-quality perovskite film formation.
- The use of DMSC significantly boosts the performance and operational stability of printable mesoscopic perovskite solar cells (p-MPSCs).
- This strategy offers a promising pathway for developing efficient and durable perovskite solar cells.
