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Thin films of solid electrolyte lithium sulfate deposited by e-beam evaporation
Date Issued
01-01-2023
Author(s)
Varghese, Sony
Hariharan, K.
Abstract
Fabrication of lithium sulfate (Li2SO4) thin films has been successfully attempted by the electron beam evaporation technique, and the deposition conditions were systematically optimized to get stable Li2SO4 thin films. The structural, optical, and electrical properties of the fabricated Li2SO4 thin films were investigated using X-ray diffraction, scanning electron microscope, vibrational spectroscopy techniques, optical transmission spectroscopy, and electrical conductivity measurements. The as-deposited Li2SO4 thin films were X-ray amorphous, although they exhibited Bragg peaks corresponding to Li2SO4 when annealed. The fundamental vibrational modes of sulfate anions in thin films were observed through FT-IR and Raman spectroscopy studies. The ionic conductivity value for the thin film was found to be 2.03 × 10-8 S cm−1 at 373 K, which is of three orders of magnitude higher than that of the bulk.