Optical determination of thermoelectric transport coefficients in a hot-carrier absorber
Résumé
Hot carrier solar cells offer potential for enhancing the energy conversion efficiency of photovoltaic devices. Transport properties of such systems remains largely unexplored, while it could hinder their efficiency. In this work, we develop an suitable framework for describing the thermoelectric ambipolar transport of photogenerated hot carriers and derive analytical expressions for the ambipolar transport coefficients valid even in the degenerate case. We demonstrate that these transport coefficients can be measured from hyperspectral photoluminescence imaging. We validate this experimental determination by showing its consistency with Boltzmann transport equation in the relaxation time approximation.