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Towards Lower Deposition Temperatures of Spray Deposited ZnO Films

Published online by Cambridge University Press:  01 February 2011

Sophie E. Gledhill ,
Nicholas Allsop ,
Pablo Thier ,
Christian Camus ,
Martha Lux-Steiner  and
Christian Herbert Fischer
Sophie E. Gledhill
Affiliation:
sophie.gledhill@hmi.de, Hahn Meitner Institute, Solar Energy, Glieniker Strasse, 100, Berlin, D-14109, Germany, 0049 30 8062 2868
Nicholas Allsop
Affiliation:
allsop@hmi.de, Hahn Meitner Institute, Solar Energy, Glieniker Strasse, 100, Berlin, D-14109, Germany
Pablo Thier
Affiliation:
pablo.thier@hmi.de, Hahn Meitner Institute, Solar Energy, Glieniker Strasse, 100, Berlin, D-14109, Germany
Christian Camus
Affiliation:
christian.camus@hmi.de, Hahn Meitner Institute, Solar Energy, Glieniker Strasse, 100, Berlin, D-14109, Germany
Martha Lux-Steiner
Affiliation:
lux-steiner@hmi.de, Hahn Meitner Institute, Solar Energy, Glieniker Strasse, 100, Berlin, D-14109, Germany
Christian Herbert Fischer
Affiliation:
fischer@hmi.de, Hahn Meitner Institute, Solar Energy, Glieniker Strasse, 100, Berlin, D-14109, Germany
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Abstract

Highly transparent, conductive ZnO:Al doped films have been deposited by a non-vacuum spray deposition method. At substrate temperatures above 400C we attain resistivites of 5x10-3Ohmcm and free charge carrier concentrations of 10-20cm-3. ZnO film growth and quality are sensitive to the precursor solution. For a non-vacuum process the properties of the films are excellent.

The challenge is to lower the deposition temperature to a maximum of 250C to be useful for Cu(In, Ga)(S, Se)2 solar cells and yet maintain the ZnO film quality and conductivity. As the deposition temperature decreases the resistivity of the ZnO drastically increases yet is conducting enough to be used undoped as the intrinsic ZnO layer. This is particularly relevant as the deposition technique is readily up-scalable to roll to roll coating processes.

Keywords

solution depositionphotovoltaicoxide
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1012: Symposium Y – Thin-Film Compound Semiconductor Photovoltaics-2007 , 2007 , 1012-Y02-10
Copyright
Copyright © Materials Research Society 2007

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