Měření šířky zakázaného pásu polovodičových nanočástic optickými metodami

Abstract

This bachelor thesis is focused on band-gap measurements of semiconductor nanoparticles. The aim of the thesis was to get acquainted with the theoretical background of band-gap measurement and experimentally determine the energy of the band-gap of selected semiconductor nanoparticles (ZnO, TiO2, g -C3N4, WO3). The band-gap measurements was optained using optical methods. The measured reflectance spectra were evaluated using the Kubelka-Munk function, and subsequently Tauc plot was computed. The value of the band-gap energy was obtained using the numerically counted first derivative of Tauc plot. The different approaches to measurement and the evaluation of data was discussed with respect to computed band-gap energies. The possible differences among to counted results and data available in literature were observed.