DETERMINING THE STRENGTH OF THE LOCAL ELECTRIC FIELD IN OXIDIZED MACROPOROUS SILICON STRUCTURES WITH ZnO AND CdS NANOPARTICLES AT THE «Si-SiO2 » INTERFACE

This paper presents the results of studies of the local electric field in macroporous silicon structures with nanocoating of microporous silicon, silicon oxide, and A2 B6 nanocrystals (ZnO and CdS). The subject of this study is the measurement of optical absorption in oxidized structures of macroporous silicon with ZnO and CdS nanoparticles at the «Si-SiO2 » interface in the near-infrared region of the spectrum. Investigated: IR absorption spectra of oxidized structures of macroporous silicon with nanocoating of ZnO nanoparticles (with an oxide thickness of 7 nm, 15 nm, and 30 nm) and CdS nanoparticles in polyethyleneimine (oxide thickness of 7 nm, 15 nm, and 30 nm). The purpose of this work is to determine the local electric field strength in the oxidized structures of macroporous silicon with ZnO and CdS nanoparticles at the «Si-SiO2 » interface. Developed — the dependences of the spectral position of the oscillation peaks for macroporous silicon structures with nanocoating of ZnO and CdS nanoparticles on their number were constructed, and the electric field strength on the oxide thickness for oxidized macroporous silicon structures without nanocoatings and with nanocoating of ZnO and CdS nanoparticles was constructed. The local electric field strength at the «Si-SiO2 — ZnO and CdS nanocoating» interface was determined by IR absorption. For macroporous silicon structures with nanocoating of ZnO nanoparticles, the electric field strength varies from 5,6∙104 V/cm to 6,3∙104 V/cm with increasing oxide thickness. The dependences of the spectral position of the oscillation maxima on their number for the oxidized structures of macroporous silicon with nanocoating of CdS nanoparticles are linear; the electric field strength for the oxidized structures of macroporous silicon with nanocoating of CdS nanoparticles varies from 5,07∙104 V/cm to 5,3∙104 V/cm and less compared to nanocoating of ZnO nanoparticles.