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Numerical investigation on efficiency improvement of double layer antireflection coating AZO/buffer/Cu2O/CuO on back-surface fluorine-doped tin oxide heterostructure solar cells

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Abstract

Optical and electrical features of Cu2O solar cells from simple primitive bufferless AZO/Cu2O to complex single/double layer-antireflection coating (S/DLARC) on back-surface fluorine-doped tin oxide (BSF/FTO), were numerically studied. The simulated cells were optimized using a low-conduction band offset buffer, controlled-defect BSF, and antireflection coating layers under a compatible fabrication process. By considering the interlayer defects, the optimized DLARC/AZO/buffer/Cu2O/CuO on BSF/FTO exhibits an improved efficiency of 9.17%, with a JSC11.45mA/cm2, a VOC1.191V, and a fill factor of 67.22% under simulated illumination (AM 1.5G, 100mW/cm2). Finally, the cell underwent simulated moisturized conditions (RH=90% at T=60°C), where its performance dramatically declined with the exposure time. The results show that the models can be adapted for prediction of the Cu2O-based-cell behavior prior to fabricating.

© 2019 Optical Society of America

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