A spray pyrolysis route to the undoped ZnO layer of Cu(In,Ga)(S,Se)2 solar cells |
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Authors: | Sophie Gledhill Alexander Grimm Nicholas Allsop Tristan Koehler Christian Camus Martha Lux-Steiner Christian-Herbert Fischer |
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Affiliation: | Helmholtz Zentrum Berlin, Glienickerstrasse 100, 14109 Berlin, Germany |
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Abstract: | The undoped ZnO in the window layer of Cu(In,Ga)(S,Se)2 solar cells is deposited here by a non-vacuum spray pyrolysis method yielding solar cells of similar efficiencies to cells prepared with the standard sputtered layer. The spray pyrolysis method allows the undoped ZnO to be deposited in sequence on the same apparatus or in-line directly after deposition of the spray-‘ILGAR’ (ion layer gas reaction) In2S3 buffer layer. Thus it is highly suitable for manufacturing, not only is spray pyrolysis economical, avoiding the need for two target sputtering systems, but for monolithic integrated modules the second ‘P2’ scribe, carried out to interconnect cells, can be undertaken before sputtering permitting the highly doped ZnO:Al front contact to directly connect to the rear Mo back contact. |
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Keywords: | VNFHF ZnO Thin film solar cell Spray pyrolysis |
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