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

Abstract:

The purpose of this research is to study the interrelation between Urbach energy (E_u), optical band gap energy (E_g), 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 400°C, 600 ^oC, and 800 ^oC. From the analyses, it obtained E_g which was varied from 2.01 eV until 2.67 eV. While E_u from 0.13 eV until 0.26 eV. The results showed that the E_u varied inversely to the E_g. The Penn model and hydrogen-like atom model theories were used to investigate the interrelation between E_u 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.

• Periodical: Materials Science Forum (Volume 1094)
• Pages: 99-104
• DOI: https://doi.org/10.4028/p-WBgdU2
• Online since: July 2023
• Authors: F. Faridawati*, Sudarsono Sudarsono, Ahmad Sholih, Gatut Yudoyono, Darminto Darminto
• Keywords: Absorption Spectroscopy, Dielectric Constant, Optical Band Gap Energy, Urbach Energy

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