Journal
SENSORS AND ACTUATORS A-PHYSICAL
Volume 279, Issue -, Pages 145-156Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.sna.2018.06.003
Keywords
MnO2; Thin films; Structural properties; Optical properties; Photodiodes
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The present work shows that manganese dioxide (beta-MnO2) nano films can be applied as a potential candidate for solar energy conversion. beta-MnO2 nano thin films were successfully grown on glass and quartz substrates using thermal evaporation technique. The structural properties of as-deposited and annealed thin films were analyzed using both X-ray diffraction and field emission scanning electron microscopy techniques. The spectroscopic characterizations of beta-MnO2 nano thin films with different film thickness were studied using spectrophotometric technique in the wavelength of 200-2400 nm. The optical constants of these films were calculated and showed variation with film thickness and annealing temperature. Wemple -DiDomenico oscillator model was applied in the non-absorbing region of refractive index spectrum in order to evaluate the dispersion parameters. The nonlinear optical parameters were calculated using the linear optical parameters. The annealing temperature considered to be a good tool for enhancement of the nonlinear optical parameters of beta-MnO2 nano films. Unraveling the correlated optical properties with the photoresponse characterizations of beta-MnO2 nano films opens the avenue to design and fabricate heterojunction photodiodes based on beta-MnO2 nano-films. The photoresponsivity, photoconductivity and specific detectivity of fabricated Au/beta-MnO2/p-Si/Al photodiodes were studied. (C) 2018 Elsevier B.V. All rights reserved.
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