Optical absorption in InP/InGaAs/InP double-heterostructure nanopillar arrays for solar cells

摘要

The light trapping properties of InP/lnGaAs/lnP double-heterostructure nanopillar arrays (DH-NPAs) solar cells have been theoretically investigated. The influence of the geometric parameters on the optical absorption of DH-NPAs has been thoroughly analyzed by using rigorous coupled wave analysis algorithm and finite element method. The optical absorption enhancement of DH-NPAs as compared to InP/lnGaAs/lnP double-heterostructure nanowire arrays (DH-NWAs) in the whole wavelength regime has been demonstrated. The short-circuit current of DH-NPAs with the optimized design can achieve 61.3 mA/cm~2, which is 15% higher than that of DH-NWAs with the same geometric configurations, and three times higher than that of thin-film layer with the same thickness. Meanwhile, the absorption profiles at different wavelength and angle-dependant - optical properties of DH-NPAs are also evaluated.