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While perovskite/organic tandem solar cells could theoretically achieve high PCEs and stabilities, their performance is hindered by a process known as phase segregation. This process degrades the performance of wide-bandgap perovskite cells and in turn adversely affects recombination processes at the tandem solar cells' interconnecting layer.

Researchers at Soochow University's Suzhou Key Laboratory of Novel Semiconductor-optoelectronic materials and devices recently devised a strategy to suppress phase segregation in wide-bandgap perovskites, thus boosting the performance and stability of perovskite/organic tandem cells. This strategy, introduced in Nature Energy, entails the use of a pseudo-triple-halide alloy incorporated in mixed halide perovskites based on iodine and bromine.