Bias-voltage-induced decomposition of 2-methyl-1,4-naphthoquinone on Ag/AlOx/Al tunnel junction

T. Wadayama, A. Kojim, A. Hatta

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10 Citations (Scopus)


Bias-voltage-induced decomposition of 2-methyl-1,4-naphthoquinone (MeNQ) dispersed in polystyrene on an Ag/AlOx/Al tunnel junction is examined using IR reflection absorption spectroscopy. Under no bias voltage, IR bands due to MeNQ decrease only slightly. In contrast, when the Ag electrode is biased to - 2.8 eV, which corresponds to the electronic absorption edge of MeNQ, the IR bands of MeNQ are significantly decreased in intensity. Bias voltages of + 2.8 eV and ±1.5 eV promote the band-intensity reduction less. These results reveal that hot holes with appropriate energies promote the decomposition of MeNQ on the tunnel junction.

Original languageEnglish
Pages (from-to)1891-1894
Number of pages4
JournalApplied Physics A: Materials Science and Processing
Issue number8
Publication statusPublished - 2004 Dec


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