Regensburg 2019 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 45: HL Posters III

HL 45.17: Poster

Donnerstag, 4. April 2019, 18:30–21:00, Poster E

Efficiency of an absorber with hot carrier harvesting — •Magdulin Dwedari, Björn Sothmann, and Dietrich E. Wolf — University of Duisburg-Essen, Lotharstr. 1, 47057 Duisburg, Germany

A hot carrier solar cell consists of an absorber and energy filters that facilitate the separation of electrons and holes before they relax to the edges of the conduction or valence band, respectively, after having been created by optical excitation with an energy much larger than the band gap. In this way the efficiency of a solar cell might be enhanced beyond the Shockley-Queisser limit. In this work we present an absorber-load system, where the absorber is modulated by the time evolution of non-equilibrium distribution functions in the valence and the conduction band due to photo excitations as well as electron-electron and electron-phonon interactions. The photo-excited hot carriers separate via energy filters and flow to a load that extracts a certain power P out of the system. A detailed examination of the efficiency with respect to the excitation strength and extracted power is presented.