DIRECTION OF PHOTOCURRENTS OF MOLECULAR PHOTODIODES WITH ORIENTED TRIAD MOLECULES

The direction of photocurrents observed on two types of monolayer with different orientations of a linear triad was studied. One monolayer w as deposited on a metal substrate having a hydrophilic surface; the ot her was deposited on one having a hydrophobic surface. The anodic phot ocurrent of the former monolayer was measured by the conventional phot ocell used in previous studies; the cathodic photocurrent of the latte r was measured by a new type of photocell. These directions of photocu rrents were consistent with the directions of the rectifiabilities of the monolayers which were expected from the energy diagrams of constit uent moieties of the triad in the two monolayers.