Enhancing the interfacial properties of wide-bandgap perovskite solar cells with organic hole transport materials approaching an efficiency of 20%.
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The interface modification between perovskite and charge transport materials is crucial for enhancing the efficiency and stability of halide perovskite solar cells (PSCs). Specifically, the properties of hole transport materials (HTMs) are vital in inverted p-i-n structured devices, as they affect perovskite crystallization and the hole transport. This study introduces new organic materials based on quinoxaline and triphenylamine that improve the interfacial properties between NiOx and perovskite through passivation, reducing interface defect sites in wide-bandgap perovskite solar cells. We have confirmed that energy level alignment and dipole moment of these HTMs are crucial for enhancing the built-in potential of PSCs. Furthermore, the hydrophobic nature of the HTMs enhances the crystallinity of the perovskite layer. Consequently, the performance and stability of PSCs using these HTMs are significantly improved, achieving a high-power conversion efficiency of 20%.