Abstract
This paper demonstrates that a double-layer antireflection (DLAR) coating can be fabricated using a single material, titanium dioxide (TiO 2 ). The optical properties of the top and bottom TiO 2 layers were controlled by varying the deposition and sintering conditions, resulting in a range of refractive indices, n =1.73–2.63 at 600 nm . Weighted average reflectances of 6.5% (measured) and 7.0% (calculated) were achieved for TiO 2 DLAR coatings in air and under glass, respectively. When implemented in a high-efficiency silicon solar cell, a short-circuit current density increase of Δ J sc =2.5 mA/cm 2 can be expected for an optimised TiO 2 DLAR coating when compared to a commercial TiO 2 single-layer antireflection coating.
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