KAJIAN SIFAT OPTIK PADA LAPISAN TIPIS REDUCED GRAPHENE OXIDE/PCBM (FENIL-C61-BUTIYRIC ACID METHYL ESTER); STUDY OF OPTICAL PROPERTIES OF REDUCED GRAPHENE OXIDE/ PCBM (FENIL-C61-BUTIYRIC ACID METHYL ESTER) THIN FILM

Agus, Jasdar, Iman Santoso

2016 | Disertasi | FMIPA

We report on how the effect of fenil-C61-butiyric acid methyl ester (PCBM) on optical properties of reduced graphene oxide thin film. Assessment optical properties of this research by determining the complex refractive index ( ? = n + ik), real and imaginary dielectric constants (?1 and ?2) and the value of the real of optical conductivity (?1). Graphene oxide has been prepared by oxidizing purified natural flake graphite via modified Hummers method and has been reduced graphene oxide thin film doped by PCBM has been fabricated by using spin coating technique. PCBM doped process of giving a solution of rGO performed chemically by mixed PCBM of 0.05 ml, 0.1 ml. 0.2 ml, 0.4 ml, 0.6 ml, 0.8 ml and 1 ml solution to rGO with the aid of a surfactant tween as adhesive water and dichlorobenzene, each of which is a solvent rGO and PCBM. The samples were characterized by FTIR, Raman and combined with the data absorbance to determinited the optical characteristics of the material. The magnitude of the complex refractive index has been successfully extracted used Kramers-Kronig analysis. The addition of PCBM concentration led to the profile of the value of extinction coefficient (k), ?2 value and the value ?1 are decreasesed, from the range of 1.5 to 6.2 eV. But the energy range 1.5-3.0 eV noticeable decrease in the value of k and ?2 significant. While the change in the value of n and ?1 with the addition of PCBM is divided into 3 regions. The first area is in the range from 1.5 to 2.7 eV energy, the second region is in the range from 2.8 to 5 eV and the third area is in the range from 5.1 to 6.2 eV. While going through the analysis of effective medium approximation (EMA) got air, water, rGO, GO and dichlorobenzene in a thin film of composite material. K values were getting down from the range of 1.5 to 6.2 eV showed that reduced graphene oxide thin film more transparent with the addition of PCBM, while the value ?1 also decreased in the same range, thereby potentially as active cell on organic solar cell.

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