Regensburg 2010 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 39: Photovoltaics II
HL 39.7: Vortrag
Mittwoch, 24. März 2010, 11:15–11:30, H3
Synthesis and Characterization of Cu2ZnSnS4 (CZTS) Nanoparticles for Application in Printed Solar Cells — •Folker Zutz, Christine Chory, Jörg Ohland, Ingo Riedel, and Jürgen Parisi — University of Oldenburg, Department of Physics, Energy and Semiconductor Research Laboratory, 26111 Oldenburg, Germany
Cu2ZnSnS4 (CZTS) is a novel compound semiconductor based on abundant and non-toxic precursor elements. The material has a high potential for photovoltaic application and exhibits a direct optical band gap of 1.5 eV and an absorption coefficient > 104 cm−1. CZTS nanoparticles (NP) are derived from colloidal synthesis presenting high yields of the CZTS nanopowder. The material is intended for development of solar cells with printed light absorber which stochiometry is already established in the nanoparticles prior to thin film formation.
We report on the structural and photoelectrical characterization of printed CZTS thin films and CZTS nanopowders. The crystal structure of CZTS NPs was investigated by XRD analysis of dried powders while the internal structure of the thin films was studied by AFM, SEM in combination with EDX spectroscopy. Absorption and photoluminescence (PL) spectroscopy were applied for analysis of the general optical properties while time-resolved PL was used for estimation of the minority carrier lifetime in thin films. Photoconductance of the thin films was studied for derivation of the threshold absorption and activation energy of charge transport.