Zn(O, S) layers for chalcoyprite solar cells sputtered from a single target
Helmholtz-Zentrum Berlin für Materialien und
2 Bosch Solar CISTech, Münstersche Str. 24, 14772 Brandenburg an der Havel, Germany
a e-mail: firstname.lastname@example.org
Accepted: 19 July 2012
Published online: 17 September 2012
A simplified Cu(In, Ga)(S, Se)2/Zn(O, S)/ZnO:Al stack for chalcopyrite thin-film solar cells is proposed. In this stack the Zn(O, S) layer combines the roles of the traditional CdS buffer and undoped ZnO layers. It will be shown that Zn(O, S) films can be sputtered in argon atmosphere from a single mixed target without substrate heating. The photovoltaic performance of the simplified stack matches that of the conventional approach. Replacing the ZnO target with a ZnO/ZnS target may therefore be sufficient to omit the CdS buffer layer and avoid the associated complexity, safety and recycling issues, and to lower production cost.
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