A strategy for fusing Dion-Jacobson/Ruddlesden-Popper spacer cations for efficient and stable perovskite solar cells
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내용
Metal-halide perovskite solar cells (PSCs) have recently achieved a noteworthy power conversion efficiency (PCE) of 26.08%, positioning them as a promising next-generation alternative to traditional silicon-based solar cells. However, the presence of grain boundaries and surface defects in the perovskite film leads to non-radiative recombination of photogenerated carriers, which adversely affects efficiency and stability. Thus, addressing these defects is crucial to realize high-performance PSCs. In this work, we have employed a strategy for fusing Dion-Jacobson (DJ)/Ruddlesden-Popper (RP) spacer cations (F-DJ/RP) to control the defects in the perovskite layer. In this strategy, we used organoammonium materials of the RP and DJ types with mono- and diammonium ligands, which have alkyl chains of different lengths. It was found that the defects and charge recombination in the perovskite layer were effectively suppressed by F-DJ/RP, and the charge transport properties were enhanced.