A zinc and bismuth containing, water-soluble glass composition comprising from 10 to 75 mole % P.sub.2O.sub.5, 5-50 mole % alkali metal oxide, up to 40 mole % ZnO and up to 40 mole % Bi.sub.2O.sub.3.

 
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> Contact layers for thin film solar cells employing group IBIIIAVIA compound absorbers
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