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The impact of oxygen inlet during close-spaced sublimation process on the as-deposited and chlorine treated microstructure of CdTe layers

: Hirsch, D.; Zywitzki, O.; Modes, T.; Morgner, H.; Späth, B.; Siepchen, B.; Drost, C.; Kraft, C.; Krishnakumar, V.; Metzner, C.


European Commission:
32nd European Photovoltaic Solar Energy Conference and Exhibition, EU PVSEC 2016 : 20 - 24 June 2016, Munich, Germany
Munich, 2016
ISBN: 3-936338-41-8
European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC) <32, 2016, Munich>
Conference Paper
Fraunhofer FEP ()
CdTe; close-spaced sublimation; sulfur diffusion; oxygen; GD-OES

In this study CdTe thin films were deposited by close-spaced sublimation (CSS) in an oxygen ambient and the influence of oxygen on the properties of as-deposited and chlorine activated CdTe microstructures were investigated. FE-SEM imaging of ion-polished cross sections of the as-deposited CdTe-layers revealed a significant change from a block-like to a columnar microstructure with increasing oxygen concentration in the gas flux. After the chlorine activation step at 440 °C the oxygen free sample shows a strong sulfur diffusion whereas samples with low oxygen inlet show a suppressed diffusion. Due to the enlarged amount of grain boundaries in the as-deposited microstructure the sulfur diffusion became stronger again with increasing oxygen concentration.