Solar cells have become an increasingly popular source of renewable energy, with researchers constantly striving to improve their efficiency and stability. Among the various designs being explored, organic solar cells based on perovskite materials have shown promise due to their lower fabrication costs, increased flexibility, and tunability compared to traditional silicon-based solar cells. However, these organic solar cells have not yet achieved the efficiency levels exhibited by silicon cells, prompting the need for innovative strategies to enhance their performance.

One of the challenges faced by researchers in improving the efficiency of perovskite/organic tandem solar cells is phase segregation in wide-bandgap perovskites. This process, caused by halogen vacancy-assisted ion migration, limits the device efficiency and lifetime by degrading the performance of the perovskite cells. This, in turn, negatively affects the recombination processes at the interconnecting layer of the tandem solar cells, hindering their overall performance.

Researchers at the Suzhou Key Laboratory of Novel Semiconductor-optoelectronic materials and devices have recently introduced a novel strategy to suppress phase segregation in wide-bandgap perovskites. By incorporating a pseudo-triple-halide alloy, including pseudo-halogen thiocyanate (SCN) ions, into mixed halide perovskites based on iodine and bromine, the researchers were able to enhance crystallization and reduce grain boundaries. This approach effectively prevented halide elements from separating inside the solar cells and slowed down crystallization, thereby facilitating the movement of electric charge within the cells.

Through their research, Zhang, Chen, and their collaborators confirmed that the introduction of pseudo-halogen thiocyanate ions into iodine/bromide mixed halide perovskites successfully retarded halide phase segregation under operation and reduced energy loss in wide-bandgap perovskite cells. When applied to the development of perovskite/organic tandem solar cells, this strategy led to significant improvements in efficiency and stability. The tandem solar cells achieved a peak power conversion efficiency (PCE) of 25.82%, a certified PCE of 25.06%, and an operational stability of 1,000 hours.

In the future, this methodology could be further refined and extended to other wide-bandgap perovskite compositions, paving the way for the development of advanced perovskite/organic photovoltaic devices that offer high efficiency, stability under varying light intensities, and prolonged operational lifetimes. By addressing the issue of phase segregation in wide-bandgap perovskites, researchers are opening up new possibilities for the use of perovskite materials in tandem solar cell applications, ultimately contributing to the advancement of renewable energy technologies.

The development of perovskite/organic tandem solar cells holds great promise for enhancing the efficiency and stability of solar energy conversion. By utilizing innovative strategies to suppress phase segregation in wide-bandgap perovskites, researchers are overcoming significant challenges and achieving remarkable improvements in PCE and operational stability. Continued research in this field is essential for unlocking the full potential of perovskite materials in solar cell applications and driving the transition towards sustainable energy sources.

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