STUDY OF A NEW ORGANIC SEMICONDUCTOR-BASED ON TCNQ AND OF ITS JUNCTION WITH DOPED SILICON (TCNQ = 7,7',8,8' TETRACYANOQUINODIMETHANE)

The spectroscopic properties of Ag-phen-TCNQ, a new organic semiconduc tor obtained by means of a charge transfer reaction involving silver a s the electron donor, TCNQ as the acceptor and the etero-aromatic liga nd 1,10 phenanthroline (phen), are investigated by means of absorption measurements in the IR-VIS-UV range and X-Ray Photoelectron Spectrosc opy (XPS). The charge distribution on TCNQ is examined and compared wi th that of AgTCNQ. The results indicate that the presence of phenanthr oline lowers the electronic gap of the semiconductor enhancing its ele ctrical conductivity with respect to that of AgTCNQ. The good electric al features and the film-forming properties of Ag-phen-TCNQ are used t o obtain an inorganic-organic heterojunction whose I/V characteristics are examined.