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Published on: March 27, 2018
Zn doped MAPbBr3 single crystal with advanced structural and optical stability achieved by strain compensation
Ruxue Li1, Shaoqing Chen2, Xia Li3
1Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen, Guangdong 518055, P. R. China. chenr@sustech.edu.cn and School of Physics, Southeast University, Nanjing, Jiangsu 211189, P. R. China.
Structural modification of zinc-doped perovskites enhances stability by compensating lattice strain under illumination. This approach significantly reduces degradation, improving the performance and longevity of perovskite solar cells.
Area of Science:
- Materials Science
- Solid-State Physics
- Photovoltaics
Background:
- Perovskite degradation hinders commercialization of perovskite devices.
- Surface modifications can negatively impact efficiency.
- Understanding degradation mechanisms is crucial for stability.
Purpose of the Study:
- To investigate the structural modification of zinc-doped perovskites for enhanced stability.
- To elucidate the mechanism of strain compensation under illumination.
- To reduce defect density and improve device performance.
Main Methods:
- Synthesis of zinc-doped perovskites (MPZB).
- Atomic-resolution observation using cryo-transmission electron microscopy (cryo-TEM).
- Photoluminescence (PL) spectroscopy and temperature-dependent PL measurements.
- Fabrication and testing of photodetectors.
Main Results:
- Zinc doping induces local lattice strain due to a smaller ionic radius.
- Photostriction under illumination compensates for lattice strain, ensuring structural stability.
- MPZB exhibits minimal PL intensity decrease (<3%) after 60 days.
- Zn doping results in the lowest defect density (ntrp = 6.33 × 108 cm-3) in MPZB solar cells (SC).
Conclusions:
- Strain compensation mechanism fundamentally improves the stability of photoelectric devices.
- Reduced defect density leads to high-performance photodetectors.
- Zinc doping offers a promising strategy for stable perovskite solar cells.
