Spectrally selective reflector surfaces for heat reduction in concentrator solar cells: modeling and applications of TiO<sub>2</sub>:Nb-based thin films

Christopher M. Maghanga; Gunnar A. Niklasson; Claes G. Granqvist; Mghendi Mwamburi

doi:10.1364/AO.50.003296

Applied Optics
Vol. 50,
Issue 19,
pp. 3296-3302
(2011)
•https://doi.org/10.1364/AO.50.003296

Spectrally selective reflector surfaces for heat reduction in concentrator solar cells: modeling and applications of ${TiO}_{2}$ :Nb-based thin films

Christopher M. Maghanga, Gunnar A. Niklasson, Claes G. Granqvist, and Mghendi Mwamburi

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Christopher M. Maghanga, Gunnar A. Niklasson, Claes G. Granqvist, and Mghendi Mwamburi, "Spectrally selective reflector surfaces for heat reduction in concentrator solar cells: modeling and applications of TiO₂:Nb-based thin films," Appl. Opt. 50, 3296-3302 (2011)

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Abstract

The energy conversion efficiency of a conventional $p n$ junction solar cell decreases as the temperature increases, and this may eventually lead to failures in the photovoltaic system, especially if it uses concentrated solar radiation. In this work, we show that spectrally selective reflector (SSR) surfaces can be important for reducing the heat buildup on passively cooled solar cells. We outline a computational scheme for optimizing DC magnetron-sputtered ${TiO}_{2}$ :Nb-based SSRs tailored for silicon solar cells and find good agreement of the reflectance with an experimental realization of the optimal SSR. A figure of merit for SSRs has also been derived and applied to the experimental data.

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Parameter	Description	Value
α	Surface absorptivity of the cell	0.85
η	Efficiency of the cell	0.2
$τ_{0}$	Ambient temperature	$300 K$
H	Convective heat transfer	$5 W / m^{2} K$
C	Concentration factor	Variable
ε	Emissivity of the cell	0.85

Sample	$R_{cell}$	$R_{them}$	FOM
(a)	0.686	0.512	0.94
(b)	0.802	0.496	0.92
(c)	0.782	0.387	0.90
(d)	0.756	0.280	0.87

Parameter	Description	Value
α	Surface absorptivity of the cell	0.85
η	Efficiency of the cell	0.2
$τ_{0}$	Ambient temperature	$300 K$
H	Convective heat transfer	$5 W / m^{2} K$
C	Concentration factor	Variable
ε	Emissivity of the cell	0.85

Sample	$R_{cell}$	$R_{them}$	FOM
(a)	0.686	0.512	0.94
(b)	0.802	0.496	0.92
(c)	0.782	0.387	0.90
(d)	0.756	0.280	0.87

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Equations (10)

Applied Optics