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Influence of HCl-activation on the performance of low and high temperature grown CdTe solar cells

: Schwuchow, Eric; Morgner, Henry; Zywitzki, Olaf; Metzner, Christoph; Modes, Thomas


Bokhoven, T.P. ; European Commission:
29th European Photovoltaic Solar Energy Conference and Exhibition, EU PVSEC 2014 : Proceedings of the international conference held in Amsterdam, The Netherlands, 22 - 26 September 2014, DVD
München: WIP, 2014
ISBN: 3-936338-34-5
European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC) <29, 2014, Amsterdam>
Conference Paper
Fraunhofer FEP ()
CdTe; CSS; plasma activation; thin film devices; GD-OES

CdTe thin film solar cells provide a good opportunity for low cost photovoltaic modules. To obtain highlyefficient solar cells with a CdS/CdTe hetero junction an activation treatment in chlorine containing atmosphere isnecessary. The common way is a CdCl2 deposition as wet solution on top of the CdTe layer followed by thermalannealing at 350-430°C. An Additional activation method is a treatment with HCl-containing gas andsimultaneously thermal annealing in the same temperature range. In this experiments, efficiencies up to 8.7%could be obtained by using a gas mixture of 2% HCl and 98% N2. The reference process with CdCl2 leads toefficiencies up to 11.8%. Here no intentional Cu-treatment was applied. The two activation methods causesdistinct differences in den chlorine content of the treated CdTe layers. The analyses contain I-V and EQEcharacterization, FE-SEM cross sections and RF GD-OES depth profiling.