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The performance and stability of dye-sensitized solar cells incorporating the new dyes were evaluated under light soaking<mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\"><mml:mrow><mml:mo>(<\/mml:mo><mml:mn>1000<\/mml:mn><mml:mtext>\u2009<\/mml:mtext><mml:mtext>W<\/mml:mtext><mml:mo>\u22c5<\/mml:mo><mml:msup><mml:mrow><mml:mtext>m<\/mml:mtext><\/mml:mrow><mml:mrow><mml:mo>-<\/mml:mo><mml:mn>2<\/mml:mn><\/mml:mrow><\/mml:msup><mml:mo>)<\/mml:mo><\/mml:mrow><\/mml:math>at<mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\"><mml:msup><mml:mn>50<\/mml:mn><mml:mo>\u2218<\/mml:mo><\/mml:msup><mml:mtext>C<\/mml:mtext><\/mml:math>. Photocurrent measurements demonstrated that proton substitution by potassium cations rends the system more stable. 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