Performance improvement of a triple-junction GaAs-based solar cell using a SiO₂-nanopillar/SiO₂/TiO₂ graded-index antireflection coating
by Jheng-Jie Liu; Wen-Jeng Ho; Jhih-Kai Syu; Yi-Yu Lee; Ching-Fuh Lin; Hung-Pin Shiao
International Journal of Nanotechnology (IJNT), Vol. 11, No. 1/2/3/4, 2014

Abstract: In this study, the enhanced performance of a triple-junction GaAs-based solar cell using a SiO₂-nanopillar/SiO₂/TiO₂ graded-index antireflection coating (GI-ARC) was demonstrated. The optical reflectance, photovoltaic current-voltage (I-V), and external quantum efficiency (EQE) of a cell with a SiO₂/TiO₂ double-layer (DL) ARC and a cell with a GI-ARC were measured and compared. The cell with a GI-ARC exhibited the lowest optical reflectance. Thus, the average EQE enhancements (ΔEQE) of the cell with a GI-ARC compared to the cell with a DL-ARC were 5.88% for the top cell and −1.56% for the middle cell. In addition, a small difference in the photocurrent generated between the top cell and the middle cell was achieved. Finally, an additional 0.52% increase (from 24.99% to 25.51%) in conversion efficiency was obtained.

Online publication date: Sat, 15-Nov-2014

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