Abstract

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.

Original languageEnglish (US)
Title of host publicationConference Record of the IEEE Photovoltaic Specialists Conference
Pages1657-1662
Number of pages6
DOIs
StatePublished - 2012
Event38th IEEE Photovoltaic Specialists Conference, PVSC 2012 - Austin, TX, United States
Duration: Jun 3 2012Jun 8 2012

Other

Other38th IEEE Photovoltaic Specialists Conference, PVSC 2012
CountryUnited States
CityAustin, TX
Period6/3/126/8/12

Fingerprint

Hot carriers
Phonons
Solar cells
Lighting
Laser excitation
Relaxation processes
Energy balance
Ultrashort pulses
Semiconductor quantum wells
Momentum
Energy conservation
Acoustics
Cooling
Electrons
Temperature

Keywords

  • hot carrier solar cells
  • hot phonons
  • Monte Carlo simulation

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Control and Systems Engineering
  • Industrial and Manufacturing Engineering

Cite this

Goodnick, S., Limpert, S., Honsberg, C., & Lugli, P. (2012). Simulation of carrier relaxation in hot carrier solar cells. In Conference Record of the IEEE Photovoltaic Specialists Conference (pp. 1657-1662). [6317914] https://doi.org/10.1109/PVSC.2012.6317914

Simulation of carrier relaxation in hot carrier solar cells. / Goodnick, Stephen; Limpert, Steven; Honsberg, Christiana; Lugli, Paolo.

Conference Record of the IEEE Photovoltaic Specialists Conference. 2012. p. 1657-1662 6317914.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Goodnick, S, Limpert, S, Honsberg, C & Lugli, P 2012, Simulation of carrier relaxation in hot carrier solar cells. in Conference Record of the IEEE Photovoltaic Specialists Conference., 6317914, pp. 1657-1662, 38th IEEE Photovoltaic Specialists Conference, PVSC 2012, Austin, TX, United States, 6/3/12. https://doi.org/10.1109/PVSC.2012.6317914
Goodnick S, Limpert S, Honsberg C, Lugli P. Simulation of carrier relaxation in hot carrier solar cells. In Conference Record of the IEEE Photovoltaic Specialists Conference. 2012. p. 1657-1662. 6317914 https://doi.org/10.1109/PVSC.2012.6317914
Goodnick, Stephen ; Limpert, Steven ; Honsberg, Christiana ; Lugli, Paolo. / Simulation of carrier relaxation in hot carrier solar cells. Conference Record of the IEEE Photovoltaic Specialists Conference. 2012. pp. 1657-1662
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