Physical properties of graphene oxide GO-doped ZnO thin films for optoelectronic application

Structural and Optical Properties of Graphene-ZnO Nanohybrid Thin Films Synthesized by Spray Pyrolysis

“…These constants are interesting structural parameters, and their values are crucial to understanding the electrical and optical behaviour of all graphene-ZnO nanohybrid films. In contrast to some reports in the literature [22], these findings have indicated that the addition of graphene has a strong effect on the microstructural feature of zinc oxide films. To investigate the influence of graphene content on the surface morphologies of the ZnO films, FESEM images were studied for all films as shown in Figure 2.…”

“…Graphene can decrease the band gap energy by removing the effect of Burstein-Moss also decreases the absorption edge of the nanohybrid thin films to the lower energies [12,21]. Moreover, the presence of graphene in the films increases the surface charge and electronic coupling between ZnO grains and graphene nanoplatelets, which leads to a shift of the band gap towards the higher wavelengths, causing a narrowing of the band gap [16,22]. Based on Figure 6, it is evident that the zinc oxide films have a single direct energy gap, while when graphene is added, two linear slopes have appeared and they became more distinct with increasing the graphene content.…”

“…Several applications using graphene as a promising candidate can be proposed, which may include photodetectors, light-emitting devices, touch screens, transparent electrodes, and ultrahigh-frequency devices [18,19]. Recently, several publications have been focused on the synthesis of graphene-ZnO nanohybrid structures to improve the device performances for photovoltaic applications [20][21][22][23][24][25][26]. The aim of the current work is a synthesis of graphene-ZnO nanohybrid thin films by spray pyrolysis technique and systematically study their structure and optical properties.…”

Experimental and DFT study of GO-decorated CaO quantum dots for catalytic dye degradation and bactericidal potential

“…By eliminating the Burstein-Moss effect, GO actually helped narrow E g and caused the red absorption shifting (Nguyen-Phan et al, 2011;Li et al, 2012). The incorporation of GO decreases E g by affecting the width of the CB and VB region with the development of multiple energy levels throughout the band gap (Karyaoui et al, 2021). The prepared samples were examined through PL spectra ranging from 200 to 800 nm with an excitation wavelength of 274 nm (Figure 3C).…”