Dresden 2017 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 36: Postersession I
DS 36.42: Poster
Mittwoch, 22. März 2017, 17:00–19:00, P2-EG
Thermal Conductivity in Kesterite Crystals — •Martin Handwerg1,2, Rüdiger Mitdank1, Laura-Elisa Valle-Rios2,3, Susan Schorr2,3, and Saskia F. Fischer1 — 1Novel Materials, Humboldt-Universität zu Berlin, 12489 Berlin, Germany — 2Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, 14109 Berlin, Germany — 3Free University Berlin, Institute of Geological Sciences, 14195 Berlin, Germany
The kesterite materials Copper-Zinc-Tin-Sulfide and -Selenide are of huge interest for future solar cell applications due to the ideal band gap and high absorption rate. Insight in the thermal conductivity of a solar absorption material is important for the thermal management of the cell and therefore for the temperature-dependent efficiency.
However, thermal conductivity investigations are rare actually.
Here we used the 3ω-method[1] to investigate the thermal conductivity of CZTSe macro-crystals with different compositions.
The crystal thicknesses were in the range of several hundred micrometers. The metal heater lines with a width of 10 µm were deposited on the polished crystal surface.
The measured thermal conductivity values are about 3 Wm−1K−1.
The measured temperature-dependence of the thermal conductivity allows conclusions concerning the transport process. Phonon-phonon-Umklapp-scattering dominates the thermal conductivity for T>180 K and point-defect-scattering occurs for T<180 K.
[1] Handwerg et al., Semicond. Sci. Technol. 30, 024006 (2015).