Dresden 2014 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 81: Poster: Energy materials incl. photovoltaics
HL 81.14: Poster
Wednesday, April 2, 2014, 17:00–20:00, P1
Development of an automated process for chemical bath deposition (CBD) of thin CdS films under inert-gas atmosphere — •Marcus Dreßler, Christine Chory, Jan Keller, Ulf Mikolajczak, Jürgen Parisi, and Ingo Riedel — Energy and Semiconductor Research Lab, Dept. of Physics, Univ. of Oldenburg, 26111 Oldenburg
Cu(In1−xGax)Se2 (CIGSe) thin film solar cells are commonly exposed to air prior to the deposition of the n-type buffer layer (e.g. CdS). To avoid atmospheric degradation of the CIGSe surface during the device fabrication process chain we develop an automated technique for chemical bath deposition (CBD) of CdS thin films which is to be performed in a nitrogen glove box. To establish CdS thin films as an in house reference for the future development of alternate buffer materials the scope of this master thesis is to develop a well-defined and reproducible CdS-CBD process which has to be integrated into the automated baseline device fabrication process. In this contribution we present first results of chemical bath deposited CdS films on glass and CIGSe thin films. This poster will particularly focus on the optical and morphological characterization of CdS films manually processed under ambient conditions with the aim to identify promising synthesis-parameters like bath temperature, concentration of reagents and deposition time. While the optical transmission is of crucial importance to minimize parasitic absorption of the buffer layer in completed solar cells we also investigated the film roughness and coverage of the substrate as obtained for different process recipes. These investigations have been carried out by laser-scanning, atomic-force and scanning-electron-microscopy.