Effect of electron irradiation on the optical properties of SrTiO₃: An experimental and theoretical investigations

Investigation of temperature-dependent optical properties of TiO2 using diffuse reflectance spectroscopy

“…The first-principles calculations are executed using FP-LAPW [23] approach and implemented in WIEN2k code [8,24,25]. The Kohn-Sham equations [26,27] were solved self-consistently using FP-LAPW method.…”

“…Optical spectroscopy is a tool which can tell about not only the optical band gap of semiconducting materials but also the disorder in the form of Urbach energy as well as various defects [8] present in semiconducting materials. Keeping this in view, here we have performed temperature-dependent DRS and report its dependency on optical band gap [4], Urbach energy [10], and Urbach focus on TiO 2 [1,15,16].…”

“…The optical band gap of prepared sample has been measured by using DRS measurements [6][7][8]. These measurements have been taken in the 200-800 nm wavelength range using Cary-60 UV-Vis-NIR spectrophotometer having Harrick Video-Barrelino diffuse reflectance probe in the temperature range of 300-450 K [22].…”

“…Diffuse reflectance spectrometer (DRS) is an effective tool to understand the absorption spectra as a function of doping or temperature. The absorption spectra obtained from DRS contain three possible transitions: (1) main absorption spectra which give the information of optical gap [6,7], (2) near absorption edge also called Urbach tail showing amount of disorder present in samples [4], and (3) lower absorption spectra which confirm the presence of defect inside the sample [8,9]. To explore the optical absorption spectra which may be affected from various parameters like temperature, structural transition, doping, etc., an influential work has been done to shape our understanding as to how band gap and disorder varies on semiconducting materials [4,10].…”

Electrophoretic deposition and characterization of self-doped SrTiO3 thin films

“…The conduction and valence band potentials of SrTiO 3 are positioned in larger negative domains than TiO 2 , making SrTiO 3 a more efficient photocatalyst in water splitting without applying any bias [12], [23,24]. [26], and Rh-doped SrtiO 3 [27] [29,30]. Therefore, the performance of SrTiO 3 is affected by lattice structure and surface electronic as a consequence of the presence of the different Ti coordination configuration and oxidation states on the surface [30,31].…”