Absorption length of photons as a function of wavelength for with bandgap . The band edge wavelength is indicated by the arrow.
(a) Schematic solar cell configuration with top ITO, 2D PC, bottom ITO, and DBR. (b) Top view of 2D PC grating layer with cylinders in an ITO background.
Fourier component of the dielectric function and filling ratio, for the first reciprocal lattice vector .
(a) The variation in average absorption with thickness of the photonic crystal , holding other parameters constant near the optimum values. (b) The average absorption as a function of , for several values of the grating depth .
The variation in average absorption with lattice spacing of the photonic crystal, holding other parameters constant near the optimum values.
The variation in average absorption with cylinder radius of the photonic crystal, holding other parameters constant near the optimum values.
(a) The absorption of the optimized photonic crystal enhanced solar cell structure as a function of the wavelength, compared to the reference cell with antireflective coating and DBR only. (b) The absorption enhancement ratio of the optimized solar cell over the reference cell without the photonic crystal. (c) The ratio of the optical path length to the absorber layer thickness, for the optimized PC enhanced solar cell (solid) compared to the reference cell (dotted). The horizontal dashed line shows the theoretical limit of path length enhancement from a randomly roughened backreflector .
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