Analysis of Energy Gap and The Refractive Index of Barium Strontium Titanate (Ba0.2Sr0.8TiO3) Films doped of Chlorophyll from Green Leafy Vegetables

EasyChair Preprint 384

Abstract

Ferroelectric films has superior optoelectronic properties and widely applied as a base of electronic components such as light sensors. Improvement the performance of the light sensor can be obtained by adding dopant materials to thin film. In recent years, organic materials as a dopant materials have been extensively used, one of them is chlorophyll. Ba0.2Sr0.8TiO3 without (0%) and with a (2.5%) dopant cassava, mustard greens, papaya, and spinach leaves chlorophyll extracts prepared on silicon substrate (100). The Ba_0.2Sr_0.8TiO₃ film growth process using chemical solution deposition method with spin coating technique of 8,000 rpm for 30 seconds in solubility 0.2 M. The Barium Strontium Titanate film was annealing at 850^oC for 8 hours with an increase of 1.7^oC/ min. The results of the reflectance data processing from the UV-Vis spectrophotometer characterization showed that the Ba_0.2Sr_0.8TiO₃ without chlorophyll has energy gap 3.25 eV at wavelength 580 nm with refractive index 1.46. Energy gap of Ba_0.2Sr_0.8TiO₃ with dopant of cassava, mustard greens, papaya, and spinach in a row are 3.24 eV, 3.22 eV, 3.00 eV, and 3,22 eV at the wavelength are 570 nm, 565 nm, 640 nm, and 570 nm  with refractive index 1.3, 1.27, 1.34, and 1.24. It can be concluded that Ba_0.2Sr_0.8TiO₃ without chlorophyll is sensitive to the orange color spectrum, Ba_0.2Sr_0.8TiO₃ with the cassava and mustard green chlorophyll are sensitive to the green spectrum, and Ba_0.2Sr_0.8TiO₃ with papaya chlorophyll is sensitive to the red spectrum.

Keyphrases: Barium Strontium Titanate, Chemical solution deposition, Energy gap, UV-Vis spectroscopy, chlorophyll

@booklet{EasyChair:384,
  author    = {Endah Kinarya Palupi and Husin Alatas and Irzaman},
  title     = {Analysis of Energy Gap and The Refractive Index of Barium Strontium Titanate (Ba0.2Sr0.8TiO3) Films doped of Chlorophyll from Green Leafy Vegetables},
  howpublished = {EasyChair Preprint 384},
  year      = {EasyChair, 2018}}