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The nature of charge injection has been investigated across the Au-poly͑3-hexylthiophene-2,5-diyl͒ ͑P3HT͒ interface of two kinds: P3HT on Au ͑bottom contact͒ and Au on P3HT ͑top contact͒. The J-V characteristics of a Au͑bottom͒/P3HT/Au͑top͒ sandwich cell are analyzed by using the Fowler-Nordheim model and the hole barrier height at the top and bottom contacts has been estimated. The top contact showed a higher barrier height in comparison to the bottom contact. The quenching of photoluminescence spectra and the disappearance of characteristic P3HT peaks from the absorption spectra for the top contact supports that the ionically sputtered gold atoms on the polymer give rise to greater density of interfacial trap sites than those at bottom interface.

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