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Luminescence inverse method For CPV optical characterization

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Abstract

The luminescence inverse method may be used to optically characterize a concentrator photovoltaic module. With this method, the module angular transmission is obtained by evaluating the light emission of a forward biased module. The influence of the emission of the cell when measuring the angular transmission is evaluated, and the process of building a global angular transmission from the set of individual optics-cell unit functions is explained. A case study of a module composed by several optics-cell units is presented. In order to validate the proposed measurement, results for five different CPV technologies are compared for both direct methods (i.e., solar simulator) and indirect methods (i.e., Luminescence inverse method).

© 2013 Optical Society of America

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Figures (5)

Fig. 1
Fig. 1 (a) Measurement diagram of the luminescence inverse method (b) The irradiance map at the Lambertian target (c) Convolution between the impulse response H(θ,φ) and the light source S(θ,φ) (d) The 1D angular transmittance T(θ) definition.
Fig. 2
Fig. 2 Lambertian emission vs. GaInP/GaInAs/Ge cell emission.
Fig. 3
Fig. 3 (a) Emission maps for top and middle subcells of Cell 1 and Cell 2 (b) Angular transmittance for the same optical system measured by LI method with Cell 1 vs. Cell 2.
Fig. 4
Fig. 4 (a) I-V curves of the CPV module deviated a given direction related to the light source. (b) Angular transmittance measured at the solar simulator recording Pmp and Isc.
Fig. 5
Fig. 5 (a). Angular transmittance curves for every single unit in the module from LI method (b). Angular transmittance curves from LI and solar simulator.

Tables (1)

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Table 1 Acceptance angles measured by direct method (AAD) and indirect (AAI) methods for five different CPV technologies, and the relative error (AAD-AAI)/AAD

Equations (1)

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v(i)= I L k >i V c (i) I L k <i V d (i I L k )
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