Solar energy is a promising renewable energy source that can help reduce our dependence on fossil fuels and mitigate the impacts of climate change. In recent years, researchers have been exploring different solar cell designs to improve efficiency, reduce costs, and enhance flexibility. One of the most exciting developments in this field is the emergence of organic solar cells based on perovskite materials. These cells offer several advantages over traditional silicon-based solar cells, including lower fabrication costs and greater tunability.

While organic solar cells have shown great potential, they still face some challenges that need to be overcome. One major issue is phase segregation, which degrades the performance of wide-bandgap perovskite cells and impacts the efficiency and stability of perovskite/organic tandem solar cells. Phase segregation is caused by halogen vacancy-assisted ion migration in the perovskite materials, limiting the devices’ lifetime and efficiency.

Researchers at Soochow University’s Suzhou Key Laboratory of Novel Semiconductor-optoelectronic materials and devices have recently proposed a novel strategy to address phase segregation in wide-bandgap perovskites. By incorporating a pseudo-triple-halide alloy with thiocyanate ions into iodine and bromine based perovskites, the researchers were able to enhance crystallization and reduce grain boundaries, preventing halide elements from separating inside the solar cells.

The introduction of pseudo-halogen thiocyanate ions into the perovskite materials successfully blocked halide ion migration, slowing down crystallization and facilitating the movement of electric charge in the solar cell. This innovative approach led to the development of perovskite/organic tandem solar cells with a remarkable power conversion efficiency of 25.82% and operational stability of 1,000 hours. These promising results demonstrate the effectiveness of the strategy in suppressing phase segregation and improving the overall performance of the solar cells.

The methodology introduced by Zhang, Chen, and their collaborators holds significant promise for the future of solar energy research. By applying this approach to a wider range of wide-bandgap perovskites with different compositions, researchers can further enhance the stability, efficiency, and longevity of perovskite/organic photovoltaics. This could pave the way for the development of sustainable solar technologies that are capable of operating under varying light intensities and delivering high performance over extended periods of time.

The innovative approach to enhancing perovskite/organic tandem solar cells proposed by the researchers at Soochow University represents a significant step forward in the field of solar energy research. By addressing the challenge of phase segregation in wide-bandgap perovskites, this strategy has the potential to revolutionize the design and performance of next-generation solar cells. With further development and refinement, this approach could help drive the widespread adoption of solar energy as a clean and renewable power source for the future.


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