Ultrawide-bandgap (UWBG) perovskites are crucial for developing monolithic all-perovskite triple-junction solar cells. However, their efficiency has been hindered by issues such as severe surface wrinkling, halide heterogeneity, and significant open-circuit voltage deficits due to high Br–I ratios. A new study presents a comprehensive strategy that addresses these challenges through surface reconstruction and halide homogenization.
The researchers employed a method that combines solvent-induced surface reconstruction with transient Cl− incorporation from oleylammonium chloride. This innovative approach effectively suppresses surface wrinkling and synchronizes Br/I crystallization, leading to a more homogeneous halide distribution. The resulting UWBG perovskite films exhibit a uniform surface potential, reduced non-radiative recombination, and enhanced carrier mobility, achieving an impressive open-circuit voltage of 1.46 V.
Performance Metrics of the New Solar Cells
When integrated with optimized absorbers of 1.6 eV and 1.22 eV, the UWBG subcell contributes to the development of all-perovskite triple-junction solar cells that demonstrate a power conversion efficiency of 30.1%, with a certified efficiency of 29.3%. This significant advancement indicates a promising pathway toward achieving efficiencies greater than 35% in all-perovskite multijunction photovoltaics.
Implications for Future Solar Technology
The findings from this research not only enhance the understanding of UWBG perovskites but also provide a practical route to improve the stability and efficiency of solar cells. The ability to regulate crystallization and eliminate morphological disorders could lead to more robust solar technologies capable of meeting future energy demands.
Conclusion
This study marks a pivotal step in the quest for high-efficiency solar cells, showcasing the potential of UWBG perovskites in advancing renewable energy technology. The integration of innovative engineering techniques offers a glimpse into the future of solar energy solutions, emphasizing the importance of material science in addressing global energy challenges.
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