Kiyayev O. Electuical conductivity and emission prohtrties of "gold nanoisland-organic molecules" sttuctures

The properties of island metal films (IMFs) in which electron and photon emissions are observed from nanometer areas (centres) have been ivestigated. These films are one of the important type of nanoobjects, and the study of their properties is particularly topical since nanoelectronics is formed now. The main aim of the present work was to prepare IMFs with a more defined structure (ordered films containing hundreds of emission centres and films containing one emission centre) and to study variation of their properties (electrical conductivity, photon emission) as a result of deposition of organic molecules. The presented data show that the obtained films have a structure which better corresponds to model assumptions that are used in theoretical consideration of the phenomena observed in IMFs. The experimental study of the photon emission characteristics of a nanocomposite (gold island-stearone molecules) demonstrated a complicated character of the light-voltage dependence and presence of several mechanisms of the photon emission caused by processes occuring both in the gold islands and in organic molecules. The Coulomb blocade effect was observed at the room temperature in the film containing one emission centre. It was also shown that molecules adsorbed on the film surface strongly influenced the value of this effect. To clarify the mechanism of emission of hot electrons more precisely, the clean ordered films were investigated as well. It was found that the Schottky effect influenced the value of the electron emission current. The obtained results allowed us to achieve a deeper understanding of physical mechanisms of the phenomena observed in IMFs.