Optical modeling of spectrally selective reflectors based on TiO2:Nb transparent conducting oxide films for silicon solar cell applications

C. M. Maghanga; G. A. Niklasson; C. G. Granqvist; M. Mwamburi

doi:10.1117/12.826304

20 August 2009 Optical modeling of spectrally selective reflectors based on TiO₂:Nb transparent conducting oxide films for silicon solar cell applications

C. M. Maghanga, G. A. Niklasson, C. G. Granqvist, M. Mwamburi

Author Affiliations +

Proceedings Volume 7407, High and Low Concentrator Systems for Solar Electric Applications IV; 74070F (2009) https://doi.org/10.1117/12.826304
Event: SPIE Solar Energy + Technology, 2009, San Diego, California, United States

Abstract

A spectrally selective reflector (SSR) can be fabricated by depositing a transparent conducting oxide on a reflective substrate. SSRs can be incorporated in concentrating solar cells in order to minimize the heating. We deposited TiO₂:Nb thin films on glass by DC magnetron sputtering, extracted optical constants, and used those to model an optimized SSR. Corresponding films were then successfully produced. The best wavelength-integrated reflectance values were 79 % and 31 % in the ranges 300 < λ < 1100 nm and 1100 < λ < 2500 nm, respectively. These data are better than those previously achieved using SnO₂:F.

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C. M. Maghanga, G. A. Niklasson, C. G. Granqvist, and M. Mwamburi "Optical modeling of spectrally selective reflectors based on TiO₂:Nb transparent conducting oxide films for silicon solar cell applications", Proc. SPIE 7407, High and Low Concentrator Systems for Solar Electric Applications IV, 74070F (20 August 2009); https://doi.org/10.1117/12.826304

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