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Influence of different TCO-systems on microstructure and performance of CdTe-solar cells in superstrate configuration

: Morgner, H.; Preussner, T.; Häfner, K.; Zywitzki, O.; Modes, T.; Kopte, T.; Siepchen, S.; Späth, B.; Drost, C.


Nowak, S. ; European Commission:
27th European Photovoltaic Solar Energy Conference and Exhibition, EU PVSEC 2012. DVD-ROM : Proceedings of the international conference held in Frankfurt, Germany, 24 - 28 September 2012
München: WIP-Renewable Energies, 2012
ISBN: 3-936338-28-0
European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC) <27, 2012, Frankfurt>
Conference Paper
Fraunhofer FEP ()
Transparent Conducting Oxide (TCO); CdTe; buffer layer

Transparent electrodes are deposited as first layers in CdTe-thin film solar cells in superstrate configuration. The transparent conductive oxides (TCO) have to withstand the thermal and chemical exposure of all subsequent process steps without degradation of the film properties. TCOs are exposed to temperature of about 500°C in CdS and CdTe deposition process. Hence, for two TCO-systems - indium tin oxide (ITO) and aluminum-doped zinc oxide (AZO) - the conductivity, absorption, crystallinitiy and surface roughness have been investigated and compared with commercial fluorinedoped tin oxide (FTO) substrates. ITO and AZO layers are deposited at room temperature and at substrate temperature of 350°C. Additionally the effect of a thermal treatment at 500°C for 30 min was investigated. The sputtered ITO and AZO TCOs show a better performance with respect to sheet resistance and absorption and a distinctive lower surface roughness than FTO layer.