Abstract
Micro-concentrated Cu(In,Ga)Se2 (µCPV-CIGSe) solar cells offer the potential to greatly reduce the consumption of raw materials while maintaining high efficiencies. A theoretical model of µCPV-CIGSe solar cells, consisting of hexagonally spaced micro-CIGSe (µ-CIGSe) solar cells embedded in the low-index dielectric matrix and µ-lenses placed on top, is proposed for optical study. It is discovered that µ-lenses enable to effectively concentrate the incident light due to the inherent nanojet phenomenon, and the µ-CIGSe absorbers trap the penetrated light within absorbers arising from wave-guided modes. The two effects co-contribute to an optimized absorption for µCPV-CIGSe solar cells with a µ-CIGSe absorber diameter of 800 nm and a pitch of 1500 nm. Short-circuit current density reaches 36.5 mA/cm2 and accounts for 98.8% compared to their plain counterparts without lenses, corresponding to an absorber material saving by a factor of 3/4. Notably, a large contacting area between lenses and CIGSe solar cells are recommended for an improved angular tolerance. Those findings will recommend design principles for further experiments.
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