7 May 2014 Optical performance of dichroic spectrum-splitting filters
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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 .
© 2014 Society of Photo-Optical Instrumentation Engineers (SPIE)
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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