Dresden 2009 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

HL: Fachverband Halbleiterphysik

HL 48: Poster 2

HL 48.81: Poster

Donnerstag, 26. März 2009, 15:00–17:30, P2

Spectral photoluminescence from semiconductor emitters without temporal and spatial coherence — •Sebastian Wilken, Sebastian Knabe, and Gottfried H. Bauer — Institute of Physics, University of Oldenburg, Germany

Photoluminescence (PL) provides means to determine physical semiconductor properties, such as spectral absorption, defect densities and their respective energy levels, and excess carrier densities which might be expressed in terms of quasi-Fermi levels. However, the luminescence emission from locally sufficiently extended emitters is lacking of temporal as well as of spatial coherence. For the modeling of those pl-photon fluxes which occur e. g. in luminescence photon coupling between tandem solar cell absorbers or in absorbers overcoated by photonic stop gaps we have applied a finite difference time domain algorithm for the photon flux in and around the semiconductor and the Fraunhofer approximation for the far field of the photon flux.

We have numerically reproduced the wavelength dependent local photon fluxes emitted from a x-tal Si waver overcoated with a one-dimensional grid on one surface and compared the numerical results with the experimental pl-fluxes detected versus angle dependence.