HIGHLY RECTIFYING ORGANIC 2-LAYER DIODES USING THE INTERFACE BETWEEN -METHYL-10-(4-METHYLBENZYL)-5,10-DIHYDROPHENAZINES AND METHYL-10-(4-METHOXYBENZYL)-5,10-DIHYDROPHENAZINES AND LIGHTLY DOPED POLY(3-METHYLTHIOPHENE)

Five dihydrophenazine derivatives, 5-methyl-10-(4-methlybenzyl-, 4-met hoxybenzyl-, benzyl, 4-cyanobenzyl- or methyl)-5,10-dihydrophenazine ( 1-5), were vacuum evaporated onto the electrochemically prepared poly( 3-methylthiophene) (PMeT) film to fabricate the organic two-layer diod es Au/PMeT/1-5/Al, which exhibited a clear rectifying effect. A larger current was observed when the gold electrode was positively biased wi th respect to the aluminum electrode. Dihydrophenazines 1 and 2, with the electron-donating benzyl groups substituted by the methyl and meth oxyl groups, exhibited remarkable high rectification with rectificatio n ratios of 120,000 at +/- 4.0 V and 12,000 at +/- 2.0 V, respectively .