Simulation of carrier relaxation in hot carrier solar cells
MetadataShow full item record
Hot carrier solar cells depend critically on the energy relaxation dynamics of photo-generated carriers in an absorber material, where hot carriers are extracted through energy selective contacts. Here we combine ensemble Monte Carlo (EMC) simulation with an energy balance equation approach, to simulate the microscopic carrier relaxation processes and corresponding electron and hole temperatures in semiconductor quantum well (QW) hot carrier solar cell structures, both under transient and steady state illumination. We include nonequilibrium optical phonons, in which a detailed balance of emission and absorption events is used to simulate the phonon population in time, with the anharmonic decay of the optical phonon population to acoustic phonons described using a phenomenological phonon lifetime. Simulation of femtosecond laser excitation in GaAs QWs show reduced cooling, depending on the optical phonon lifetime and excitation intensity. Steady state simulation under AM0 solar illumination shows a build-up of hot phonons over long times depending on the phonon lifetime, although they are not readily re-absorbed due to momentum and energy conservation considerations. © 2012 IEEE.
Showing items related by title, author, creator and subject.
Dynamical Simulation Of A Perturbed Phonon Distribution Induced By Hot-Carrier Thermalisation In GaAs Lugli P; Jacoboni C; Reggiani L; Kocevar P (SPIE, 1987)Time-resolved luminescence and Raman measurements have indicated in recent years the existence of nonequilibrium phonon distributions, as a result of the cooling of phototexcited electrons and holes in GaAs. While several ...
Popescu B; Popescu D; Luppina P; Julian T; Koblmüller G; Lugli P; Goodnick S (IEEE, 2015)In this paper, we investigate the electrical and optical properties of novel InGaAs nanowire solar cells. Key features like high optical absorption and excellent charge carrier mobility make them an attractive candidate ...
Colasanti S; Nesswetter H; Zimmermann CG; Lugli P (Institute of Electrical and Electronics Engineers Inc., 2014)In this paper a calibrated model of a III-V triple junction solar cell is presented. The simulations are carried out with a commercial TCAD software, and the model is validated by a comparison of the EQE and IV curve with ...