Narrow-bandwidth solar upconversion: Case studies of existing systems and generalized fundamental limits
Narrow-bandwidth solar upconversion: Case studies of existing systems and generalized fundamental limits
Upconversion of sub-bandgap photons is a promising approach to exceed the Shockley-Queisser limit in solar technologies. Calculations have indicated that ideal, upconverter-enhanced cell efficiencies can exceed 44% for non-concentrated sunlight, but such improvements have yet to be observed experimentally. To explain this discrepancy, we develop a thermodynamic model of an …