X. Zhang, X. H. Sun, H. Huang, X. S. Wang, Y. Q. Huang and X. M. Ren (2014) Optical absorption in InP/InGaAs/InP double-heterostructure nanopillar arrays for solar cells. Journal/Applied Physics Letters 104 5. [In English]
Web link: http://dx.doi.org/10.1063/1.4865246
Keywords: COUPLED-WAVE ANALYSIS; EFFICIENCY; SILICON; IMPLEMENTATION; MECHANISM; GRATINGS; GROWTH; DESIGN

Abstract: The light trapping properties of InP/InGaAs/InP 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/InGaAs/InP 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. (C) 2014 AIP Publishing LLC.