Optical performance of dichroic spectrum-splitting filters

Deming Zhang; Yuechen Wu; Juan M. Russo; Michael Gordon; Shelby D. Vorndran; Raymond K. Kostuk

doi:10.1117/1.JPE.4.043095

Abstract

We investigate the optical performance of dichroic filters used in solar spectrum-splitting applications. Photovoltaic (PV) systems utilizing spectrum splitting have higher theoretical conversion efficiency than single-bandgap PV modules. Dichroic filters have been used in several spectrum-splitting optical system designs with success. However, dichroic filters only achieve ideal performance under collimated incident light. With an incident angle constraint the optical concentration ratio is limited. A high-concentration ratio helps to achieve high-conversion efficiency and control cost by reducing the PV cell area. In a dual-junction spectrum-splitting PV configuration with a gallium arsenide (GaAs) PV cell and a 2.1-eV bandgap PV cell, the experimental dichroic filter can provide 86.3% of the ideal designed performance. The filter nonideal performance under focused incident light is simulated with ZEMAX. System efficiency under different F -number and filter refractive index is simulated for dual-junction and three-junction systems to show the performance of dichroic filters. We have found that for a dual-bandgap spectrum-splitting system there is a 0.32% system efficiency gain associated with a filter refractive index increased from 1.5 to 1.95. An efficiency gain of 0.41% is associated with an aperture size reduction from F2.0 to F3.0 . In a three-junction configuration, simulation shows that a 0.57% system efficiency gain is possible when the filter refractive index is increased from 1.5 to 1.95. An efficiency gain of 0.63% is associated with an aperture size reduction from F2.0 to F3.0 .

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Deming Zhang, Deming Zhang, Yuechen Wu, Yuechen Wu, Juan M. Russo, Juan M. Russo, Michael Gordon, Michael Gordon, Shelby D. Vorndran, Shelby D. Vorndran, Raymond K. Kostuk, Raymond K. Kostuk, } "Optical performance of dichroic spectrum-splitting filters," Journal of Photonics for Energy 4(1), 043095 (7 May 2014). https://doi.org/10.1117/1.JPE.4.043095 . Submission:

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