Enhanced Optical, Electrical and Dielectric Properties ofWO3 Stacks Via Indium Nanosheets

Abstract

This study investigates the effect of inserting 50 nm and 100 nm indiumnanosheets between tungsten oxide layers to create WO3 /In/WO3 (WIW)films. Fabricated by vacuum evaporation, these amorphous WIW filmsshowed a 62% reduction in average surface roughness. Indium nanosheetsenhanced optical properties, increasing visible and infrared light absorptionby 256% at 3.0 eV and 224% at 1.76 eV, while reducing the energy band gap from 2.94 to 2.11 eV with thicker nanosheets. WIW films exhibited enhanced dielectric and optical conductivity responses leading to an improved terahertz cutoff frequencies values of 1.6–9.6 THz in the light range of 1.13–3.0 eV. Electrical resistivity dropped by two and four orders of magnitude for 50 and100 nm layers, respectively. These combined improvements make WIW films promising for electro-optical application