Interface Modification by Quinoxaline-based Materials an Effective Strategy for Suppression Recombination of Perovskite Solar Cells in Indoor Environments
발표자
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초록
내용
In low light conditions, perovskite solar cells (PSCs) become sensitive to even low densities of defects due to a very low light intensity. To achieve high power conversion efficiency, reducing defects inside PSCs is important. Here, we introduced quinoxaline-phosphine oxide-based organic molecules (QxTTPO2) as buffer layer between electron transport layer and electrode to reduce interfacial defects. Atomic force microscope and kelvin probe force microscopy results indicated QxTTPO2 showed homogeneous chemical and electrical properties of the surface, suppressing charge recombination. PCSs with QxTTPO2 showed indoor power conversion efficiency of 27.19% with high FF of 0.81 under LED 1000 lux. Using QxTPPO2, we fabricated an indoor perovskite module with 7 devices integrated, demonstrating maximum power of 2,418 μW at Halogen 1000 lux. These results show that suppression of non-radiative recombination is an effective strategy to enhance PSCs performance in low light conditions.