Interface Engineering with Hole Transport Organic Materials for Wide-Bandgap Perovskite Solar Cell
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Organic-inorganic perovskite solar cells (PSCs) have been emerged as promising photovoltaic devices due to their exceptional optoelectronic properties. In inverted PSC structures, the interface modification between perovskite and charge transport materials is critical to enhance the efficiency. For wide-bandgap PSCs having p-i-n structures, nickel oxide has been investigated as one of the effective hole transport materials (HTMs) owing to cost-effectiveness and visible region transparency, but it has the shortcomings of low conductivity and surface morphology. Herein, we appiled the newly designed quinoxaline and triphenylamine-based organic materials for passivating the defects of perovskite layer. We confirmed improvement of built-in potential of PSCs and perovskite morphology with higher crystallinity through the increased hydrophobicity of the HTMs. Consequently, the performance of the power conversion efficiency of PSC incorporating these HTMs has increased from 18.6% to 20.0%.