SPLTRAK Abstract Submission
Photovoltaic Thermal Management in Luminescent Solar Concentrators
Megan E Phelan1, David R Needell1, Maggie M Potter2, Haley C Bauser1, Catherine Ryczek1, Ralph G Nuzzo2, Harry A Atwater1
1California Institute of Technology, Pasadena, CA, United States
/2University of Illinois at Urbana-Champaign , Champaign, IL, United States

Photovoltaic (PV) performance is dependent on device operating temperature. This means that as a solar cell heats up, its performance may degrade.  In this study, we show that luminescent solar concentrators (LSCs) redistribute absorbed radiation and thermalization losses away from the photovoltaic cell to the waveguide in an LSC, thereby keeping the PV cell cooler.  Given their ubiquitous presence, our study focuses on Si devices. Here we model Si operating temperatures in an LSC compared to operating temperatures for a conventional planar Si wafer of the same dimensions and material. We further examine the effects of PV orientation and luminophore properties within the LSC waveguide on PV temperature. Given our orientation study, we observe that while there exists some variation in operating temperature for a coplanar vs. edge-lined device, LSCs maintain a PV temperature that is at least 10°C cooler than its conventional wafer counterpart, regardless of PV orientation within the LSC. By modeling LSC module efficiencies across varied luminophore properties—absorption, PL, stokes’ shift—we finally analyze the effects of varied LSC systems on PV performance and suggest optimal luminophore properties to improve PV temperature coefficients. Our models demonstrate that optimal PV performance, via temperature efficiency coefficient, occurs when the LSC luminophore PL peak is closely matched to the PV bandedge. Through this study, we demonstrate the advantages of LSCs to improve PV temperature coefficients, as well as suggest additional pathways to further lower PV operating temperatures within LSC systems.