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HL: Fachverband Halbleiterphysik
HL 27: Photovoltaics: Innovative Material Systems
HL 27.5: Vortrag
Dienstag, 27. März 2012, 10:30–10:45, ER 270
Radiative recombination in Cu2ZnSnS4 thin films with varying composition — •Steffen Kretzschmar, Sergej Levcenco, Justus Just, Bjoern Schubert, and Thomas Unold — Helmholtz-Zentrum Berlin, Institut für Technologie, Hahn-Meitner Platz 1, 14109 Berlin
The quarternary compound Cu2ZnSnS4 may be used as an absorber material for thin film solar cells. Although current conversion efficiencies are much lower than for Cu(In,Ga)Se2-based solar cells, 8.4% have been demonstrated recently. Currently, little is known about the optical and electronic properties of this materials, in particular about defects and radiatiative recombination behaviour. In this work Cu2ZnSnS4 thin films with widely varying composition, grown by coevaporation, are investigated by photoluminescence spectroscopy. At low temperature shallow and deep transitions are observed. By temperature and intensity dependent measurements the nature of these transitions are identified.