Disorder - Induced Characteristics Based on Optical Absorption of SiO2/rGO - Like Carbon Films

F. Faridawati*, Sudarsono, Ahmad Sholih, Gatut Yudoyono, Darminto

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review


The purpose of this research is to study the interrelation between Urbach energy (Eu), optical band gap energy (Eg), and complex dielectric constant (ε) in relation to the disorder induced properties of SiO2/rGO thin films. The rGO-like carbon was created by annealing coconut shell carbon (csc) at different temperatures of 400oC, 600 oC, and 800 oC. From the analyses, it obtained Eg which was varied from 2.01 eV until 2.67 eV. While Eu from 0.13 eV until 0.26 eV. The results showed that the Eu varied inversely to the Eg. The Penn model and hydrogen-like atom model theories were used to investigate the interrelation between Eu and ε. Finally, it is shown that the Urbach energy is linearly and inversely related to the imaginary and real parts of dielectic constant, respectively.

Original languageEnglish
Title of host publicationMaterials Science Forum
PublisherTrans Tech Publications Ltd
Number of pages6
Publication statusPublished - 2023

Publication series

NameMaterials Science Forum
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752


  • Absorption spectroscopy
  • Dielectric constant
  • Optical band gap energy
  • Urbach energy


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