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DS: Fachverband Dünne Schichten
DS 32: Poster Session IV: Atomic layer deposition; Organic thin films; Organic Electronics and Phototovoltaics; Organic Materials for Spintronics - from spinterface to devices; Thin film photovoltaic materials and solar cells
DS 32.61: Poster
Thursday, March 14, 2013, 17:00–20:00, Poster B2
A study of compensation in CZTSSe absorber layers by Photoluminescence spectroscopy and Capacitance-Voltage profiling — •Steffen Kretzschmar, Sergej Levcenko, Justus Just, and Thomas Unold — Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Institut für Technologie, Hahn-Meitner-Platz 1, D-14109 Berlin
With the demonstration of a conversion efficiency of 11.1% the potential of Cu2ZnSn(S,Se)4 (CZTSSe) as an alternative absorber material for thin film photovoltaics has been confirmed. Nevertheless only little knowledge exists on the electronic properties in the bandgap. Especially a thorough understanding of beneficial electronic properties and their dependence on the chemical composition of the material is needed to improve the CZTS solar cell performance further.
Here a study by Photoluminescence (PL) spectroscopy of absorber layers in a wide range of composition is presented. Excitation and temperature dependent PL-measurements are carried out and are related to the findings from Capacitance-Voltage (CV) profiling on solar cells made of absorber layers from the same growth process. The results exhibit a beneficial influence of compensation by donors on the conversion efficiency of CZTSSe solar cells.