Hole injection from diamond into conducting polymer

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Abstract
Current–voltage characteristic and electroluminescence (EL) have been observed in a heterojunction device using a conducting polymer, poly(2-methoxy-5-dodecyloxy1,4-phenylenevinylene) (MDDO-PPV), and a diamond film prepared by microwave plasma chemical vapor deposition with Al/MDDO-PPV/diamond/Si structure. These results can be interpreted in terms of the hole injection from diamond into MDDO-PPV and occurrence of radiative recombination in MDDO-PPV. The electronic energy structure evaluated from electrochemical and photoelectrochemical measurements suggests that the diamond film is suitable for hole injection in the conducting polymers, being consistent with the current–rectifying characteristics of the EL device. The observed photocurrent spectra suggest the important roles of surface and/or interface effects of the diamond films.