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Design and mechanism of cost-effective and highly efficient ultrathin (< 0.5 μm) GaAs solar cells employing nano/micro-hemisphere surface texturing
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Image of FIG. 1.

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FIG. 1.

(a) Tilted three-dimensional schematic of the proposed nano-hemisphere array textured ultrathin film-based GaAs solar cell configuration, and (b) the refractive index n, and extinction coefficient k of GaAs used for optical properties calculations of the above structures.

Image of FIG. 2.

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FIG. 2.

(a) Reflection, (b) transmission, and (c) absorption spectra of the nano-hemisphere array (D = P) textured ultrathin (200 nm) film-based GaAs solar cells at different array periodicities. The optical spectra of a 200 nm flat GaAs film serve as reference.

Image of FIG. 3.

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FIG. 3.

(a) Optical spectra of the 400 nm thick GaAs film with and with no a nano-hemisphere array surface texture having P and D of 100 nm, and (b) ultimate efficiency of the nano-hemisphere array (D = P) textured 200 nm GaAs film-based solar cells as a function of P. The ultimate efficiency of a 1000 nm thick GaAs film serves as reference.

Image of FIG. 4.

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FIG. 4.

Light absorption spectra of the optimized nano-hemisphere array (D = P = 500 nm) textured 200 nm GaAs film-based solar cells under oblique incidence of 0, 30 and 60°. The inset table summarizes the ultimate efficiency corresponding to the aforementioned incidence conditions, and the ultimate efficiency of a 1000 nm thick GaAs film serves as reference.

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/content/aip/journal/adva/3/3/10.1063/1.4799731
2013-03-28
2014-04-25

Abstract

Low aspect-ratio nano/micro-hemisphere surface texturing is introduced for improving light management in ultrathin GaAs solar cells. A 200 nm thick film textured by the optimal GaAs nano/micro-hemisphere array with both the hemisphere diameter and array periodicity of 500 nm can achieve >90% light absorption from 1.44 to 2.5 eV, lying in the high photon density energy regime of the solar spectrum for GaAs. The excellent light confinement and low aspect ratio, which is thus convenient for conformal deposition of electrodes for efficient photogenerated carrier collection of the proposed structure will facilitate realization of highly efficient and cost-effective ultrathin GaAs solar cells.

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Scitation: Design and mechanism of cost-effective and highly efficient ultrathin (< 0.5 μm) GaAs solar cells employing nano/micro-hemisphere surface texturing
http://aip.metastore.ingenta.com/content/aip/journal/adva/3/3/10.1063/1.4799731
10.1063/1.4799731
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