Journal of Analytical & Bioanalytical Techniques
Open Access

Abstract

Earlier it has been shown by us that target illumination can increase an exit of positive ions (a so-called anomaluos secondary-ionic photoeffect). This report concerns semiconductor-dielectric structure Su-GaAs-AlGaAs-SiO-Cu. The Сu film electrode on the side GaAs was carried out continuous, and on the side SiO - in the form of interdigital combs. Attaching contacts to each of combs and to the continuous electrode, we receive the three-electrode structure which characteristics depend on a power supply circuit of constant voltage. This structure consists of two circuits equal in rights each of them includes the general electrode and one of combs. At electric measurements influence of one chain on another that is characteristic for the transistor was revealed. As the initial semiconductor heterostructure possessed photoconductivity mutual influence of chains was supplemented with light control. Thus, we deal with phototransistor structure. At a premise of such structure in ultrahigh vacuum of a mass spectrometer possibility of management of an exit of secondary ions by means of illumination of different spectral structure, and also change of size and polarity of the enclosed voltage is reached. Such a semiconductor-dielectric structure allows to operate, on the one hand, an output of secondary ions (technological control), and with another - supposes use for a characterization of the structure. Thus it is possible to define a doping profile, depth of the electron-hole junction, photosensitivity etc. The told above allows to consider that we deal with the device of optoionics - new area of a science and the technology which is born at research of influence of light on an output of secondary ions from photosensitive target, received the name of a secondary-ionic photoeffect.

Biography

A G Rokakh graduated from Physical Department of the Saratov N.G. Chernyshevsky State University in 1957 and continued his work as a scientific researcher and a teacher. He is a professor of the nano- and biomedical technology department of the mentioned university. He has above 350 publications in various fields, mainly in semiconductor physics. He was a member of the desk board of the international journal Physics Express and a nominator of Prof. A. G. Rokakh Award for the best paper in semiconductor physics of the same journal; the full member of the American Nano Society.