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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...
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