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Screen printed c-Si thin film solar cells on insulating substrates

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5 Author(s)
Rentsch, J. ; Fraunhofer-ISE, Freiburg, Germany ; Huljic, D.M. ; Kieliba, T. ; Bilyalov, R.
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A simple industrially feasible process scheme, the screen printed buried base contact (BBC) concept, was applied to Cz-Si wafers as well as to c-Si thin films (CSiTF) on insulating substrates. Cells with interdigitated front grid design on untextured Cz-Si wafers show fill factors up to 73% and a maximum efficiency of 11.5%. The application of the process to CSiTF on insulating substrates yields in an V/sub oc/ of 509 mV. Despite series resistance values below 1 /spl Omega/cm/sup 2/ the cells are severely limited by a low fill factor as well as an inactive cell area of 27% including grid shading and unpassivated base area. In particular, rough surfaces of the CSiTF's prevent good printing alignment, resulting in shunt resistances below 50 /spl Omega/cm/sup 2/. These first results lead to a 3% efficiency of CSiTF cells. Thus, the challenge for future oneside contacting schemes will be the modification of the BBC concept regarding reduced alignment requirements.

Published in:

Photovoltaic Energy Conversion, 2003. Proceedings of 3rd World Conference on  (Volume:2 )

Date of Conference:

18-18 May 2003