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Chemistry of co-evaporated CIGS surfaces submitted to chemical treatments relevant to fabrication steps were investigated by XPS and admittance spectroscopy. A Se XPS signal specific of the CIGS surfaces was identified. Surface states seen by Admittance and surface chemistry are seen to change significantly during the elaboration steps. Consequences for device elaboration are briefly discussed.
Thermally stimulated current (TSC) and Time of flight (TOF) experiments have been performed on the same set of Pt/a-SiGe:H Schottky diodes in order to compare the band tail characteristics obtained from the two methods. For the silicon rich alloys, good agreement is found in the values of the band tail width. However, the values of the attempt-to-escape frequencies obtained from TSC are typically orders of magnitude smaller than those obtained from TOF. To analyse the origin of this discrepancy we propose another kind of TSC experiment denoted Pulsed TSC: short voltage pulses are applied to the sample while it is heated and the resulting current is monitored. Preliminary results are presented and discussed .
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