Abstract
The hot carrier solar cell (HCSC) thermodynamic model was introduced with a very high conversion efficiency η, showing their potential for solar energy conversion. Although understanding HCSC physics and operation in detail from experimental data is crucial, no dedicated HCSC device has been processed. We evaluate η models in view of realistic features and parameters. Phonon polaritons and elastic electron–electron scattering are vital non-equilibrium phenomena which have a strong impact on η, yet have not been included properly in HCSC modelling. Starting with its original concept, we evaluate several HCSC types from a practical viewpoint. Boron antimonide (BSb) is a hot carrier absorber (HCA) material with excellent phonon (ħω) dispersion and electronic properties. It has a strong hot ħω bottleneck as evident from electronic and ħω dispersions obtained by density functional theory (DFT) calculations, corroborated by measured strong photon absorption near its indirect electronic band gap.
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