Effect of solution molarity on the structural, optical, electrical and photo-response properties of SILAR-deposited ZnO films

Swati M. Pujar; Sahana Moger; Gowrish K. Rao; M. G. Mahesha; Ashwath Kulal

doi:10.1007/s10854-022-09457-2

Effect of solution molarity on the structural, optical, electrical and photo-response properties of SILAR-deposited ZnO films

Swati M. Pujar, Sahana Moger, Gowrish K. Rao, M. G. Mahesha, Ashwath Kulal

Research output: Contribution to journal › Article › peer-review

Abstract

Cost effective SILAR method was employed to deposit ZnO thin films on glass substrates for thin film UV photodetector applications. The dependence of the film properties such as structure, morphology, optical and electrical properties on the cationic precursor molarity is investigated in detail. When the solution molarity was increased from 0.1 M to 0.2 M, the crystallite size was found to increase by 270%. It was noted that the films had nearly stoichiometric composition. The SEM images revealed the presence of rod or needle-like structures in the films. The optical energy band gap of the films is slightly modified while the PL spectra showed reduced defect states and enhanced UV emission at higher molarities. The samples responded strongly to wavelengths in the near ultraviolet region. A 1400 times increase was observed in the current upon the UV illumination. The films exhibited persistent photocurrent.

Original language	English
Article number	164
Journal	Journal of Materials Science: Materials in Electronics
Volume	34
Issue number	3
DOIs	https://doi.org/10.1007/s10854-022-09457-2
Publication status	Published - 01-2023

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Atomic and Molecular Physics, and Optics
Condensed Matter Physics
Electrical and Electronic Engineering

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10.1007/s10854-022-09457-2

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title = "Effect of solution molarity on the structural, optical, electrical and photo-response properties of SILAR-deposited ZnO films",

abstract = "Cost effective SILAR method was employed to deposit ZnO thin films on glass substrates for thin film UV photodetector applications. The dependence of the film properties such as structure, morphology, optical and electrical properties on the cationic precursor molarity is investigated in detail. When the solution molarity was increased from 0.1 M to 0.2 M, the crystallite size was found to increase by 270%. It was noted that the films had nearly stoichiometric composition. The SEM images revealed the presence of rod or needle-like structures in the films. The optical energy band gap of the films is slightly modified while the PL spectra showed reduced defect states and enhanced UV emission at higher molarities. The samples responded strongly to wavelengths in the near ultraviolet region. A 1400 times increase was observed in the current upon the UV illumination. The films exhibited persistent photocurrent.",

author = "Pujar, {Swati M.} and Sahana Moger and Rao, {Gowrish K.} and Mahesha, {M. G.} and Ashwath Kulal",

note = "Funding Information: The authors wish to thank Prof. (Dr) Sudha D. Kamath (MIT, Manipal) and Mr. K R Vignesh for their help in obtaining PL spectra of the films (JASCO spectrofluorometer FP-8500—DST SERB) and Central Instrumentation Facility, MIT, MAHE, Manipal for characterization facilities and financial support. Publisher Copyright: {\textcopyright} 2023, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.",

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doi = "10.1007/s10854-022-09457-2",

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AU - Moger, Sahana

AU - Rao, Gowrish K.

AU - Mahesha, M. G.

AU - Kulal, Ashwath

N1 - Funding Information: The authors wish to thank Prof. (Dr) Sudha D. Kamath (MIT, Manipal) and Mr. K R Vignesh for their help in obtaining PL spectra of the films (JASCO spectrofluorometer FP-8500—DST SERB) and Central Instrumentation Facility, MIT, MAHE, Manipal for characterization facilities and financial support. Publisher Copyright: © 2023, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.

PY - 2023/1

Y1 - 2023/1

N2 - Cost effective SILAR method was employed to deposit ZnO thin films on glass substrates for thin film UV photodetector applications. The dependence of the film properties such as structure, morphology, optical and electrical properties on the cationic precursor molarity is investigated in detail. When the solution molarity was increased from 0.1 M to 0.2 M, the crystallite size was found to increase by 270%. It was noted that the films had nearly stoichiometric composition. The SEM images revealed the presence of rod or needle-like structures in the films. The optical energy band gap of the films is slightly modified while the PL spectra showed reduced defect states and enhanced UV emission at higher molarities. The samples responded strongly to wavelengths in the near ultraviolet region. A 1400 times increase was observed in the current upon the UV illumination. The films exhibited persistent photocurrent.

AB - Cost effective SILAR method was employed to deposit ZnO thin films on glass substrates for thin film UV photodetector applications. The dependence of the film properties such as structure, morphology, optical and electrical properties on the cationic precursor molarity is investigated in detail. When the solution molarity was increased from 0.1 M to 0.2 M, the crystallite size was found to increase by 270%. It was noted that the films had nearly stoichiometric composition. The SEM images revealed the presence of rod or needle-like structures in the films. The optical energy band gap of the films is slightly modified while the PL spectra showed reduced defect states and enhanced UV emission at higher molarities. The samples responded strongly to wavelengths in the near ultraviolet region. A 1400 times increase was observed in the current upon the UV illumination. The films exhibited persistent photocurrent.

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Effect of solution molarity on the structural, optical, electrical and photo-response properties of SILAR-deposited ZnO films

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