The Role of Ethylene Diamine Catalyst in NiO<SUB>x</SUB> Sol-Gel for Accelerating Hole Extraction in Perovskite Photovoltaic Cells
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초록
내용
In nickel oxide (NiOx) sol-gel synthesis, the use of an ethylene diamine (EDA, amine Lewis base) determines the coordination properties of metal ions (Lewis acid). The morphological and electrical characteristics were verified in NiOx with each EDA molar ratio. Specifically, this method induced the changes (NiOx particle sizes and affinity/crystallinity of MAPbI3 perovskite). Moreover, the deepest energy levels were demonstrated in the optimized condition via UPS analysis. This is due to enhanced coordination bond (Ni-O) in the critical condition. Further, the synthesized NiOxwas applied as HTL in perovskite photovoltaics. Based on charge dynamics, higher cell parameters were observed in the optimized devices. This is attributed to the energy level balance between the active layer (MAPbI3) and NiOx (0.175 mol EDA), which are advantageous in hole transfer. Finally, this method represents specific roles and effects of EDA catalysts and insights for complex chemistry engineering.