Nano-sphere surface arrays based on GaAs solar cells

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In this paper,we present our efforts on simulating and analyzing the effect of two-dimensional nano-sphere surface array on the characteristic of GaAs solar cells.Based on the scattering and diffraction theory of the photonic crystals,the simulation results show that the distance of adjacent nano-spheres (D) has the pronounced influence on the conversion efficiency and exhibits much poor tolerance,the absolutely conversion efficiency is reduced by exceeding of 2% as the D varies from 0 to 1μm,in addition,the lower conversion efficiency (< 18%) is exhibited and almost remains unaltered when the D is of > 2μm.The radius (R) of nano-spheres demonstrates much great tolerance.For D =0,the solar cells exhibit high conversion efficiency (> 20%) and the efficiency is only varied by less than 1% when R is varied in a very wide region of 0.3-1.2μm.One can also find out that there is good tolerance for efficiency around the optimal value of refractive index and there is only about 0.2%decrease in final cell efficiency for around ±24% variation in the optimal values,which implys that it does not demand high precision processing equipment and the whole nano-sphere array could be fully complemented using self-assembled chemical methods.
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