Dresden 2011 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 68: Photovoltaics: Chalcopyrites II
HL 68.1: Vortrag
Donnerstag, 17. März 2011, 10:15–10:30, FOE Anorg
Radiative recombination of Cu2ZnSnS4 thin films and single crystals — •Steffen Kretzschmar1, Justus Just1, Björn Schubert1, Susan Schorr1, Thomas Unold1, Serghei Levcenko2, Victor E. Tezlevan2, and Ernest Arushanov2 — 1Helmholtz Zentrum Berlin für Materialien und Energie, 14109 Berlin — 2Institute of Applied Physics, Academy of Sciences of Moldova, Chisinau, MD 2028, Moldova
Cu2ZnSnS4 is an interesting absorber material for thin film solar cells, because it uses non-toxic and earth abundant elements. The best efficiencies reached so far are much lower than the record efficiencies of chalcopyrite thin film solar cells, 6.8% for Cu2ZnSnS4 and 9.6% for Cu2ZnSn(S,Se)4 have been reported in the literature. So far there is little knowledge about the optical and electronic properties of these materials. In this work Cu2ZnSnS4 thin films grown by coevaporation and Cu2ZnSnS4 single crystals grown by iodine transport chemical vapour deposition are investigated by photoluminescence spectroscopy. At low temperature shallow and deep transitions are observed. By temperature and intensity dependent measurements these transitions are identified as excitons and free-bound transitions, respectively.