Patent ID: 7663236

Claim:
A semiconductor electrode, comprising: a transparent electrode consisting essentially of a substrate and a conductive material coated on the substrate; and a metal oxide layer formed on a surface of the transparent electrode, wherein the metal oxide layer contains a phosphate; and wherein the metal oxide layer is formed using a paste composition comprising a metal oxide, a solution of a binder in a solvent and a phosphate group-containing compound selected from the group consisting of the following Formulae 1 to 3: wherein R is C 1 -C 30 linear or branched alkyl, and k is an integer from 1 to 20; wherein X is an oxyethyl methacryloyl, oxyethyl acryloyl, polyoxypropyl methacryloyl or polyoxyethyl methacryloyl group, and l is an integer from 1 to 20; and wherein R 1 , R 2 and R 3 are independently OH, ONa or C 1 -C 30 linear or branched alkyl, provided that at least one of R 1 , R 2 and R 3 is C 1 -C 30 linear or branched alkyl.