Improved nonlinear absorption mechanism of tin oxide thin films

Role of strontium doping

M. S. Bannur, Albin Antony, K. I. Maddani, Aninamol Ani, P. Poornesh, Ashok Rao, K. S. Choudhari, Suresh D. Kulkarni

Research output: Contribution to journalArticle

Abstract

We report the effect of strontium doping on third-order nonlinear optical properties of tin oxide (SnO2) thin films grown via chemical spray pyrolysis technique. The X-ray diffraction (XRD) results reveal that films exhibit a polycrystalline phase with a tetragonal crystal structure. The broadening and shifting of diffraction peak indicate that the dopant Sr2+ ion successfully replaced the Sn sites of SnO2 lattice. The reduction of crystalline size from 23.92 to 12.96 nm indicates the assimilation of point defects such as interstitial and oxygen vacancies in the SnO2 lattice upon doping. The surface morphological analysis via atomic force microscopy indicates the shattering of grains into small particles upon Sr doping. The energy band gap of films shows a substantial drop from 3.97eV to 3.03eV due to the formation of sub-band levels in the forbidden gap. Photoluminescence (PL) spectra show intense, broad asymmetric emission bands centred around 390 nm and extending up to 500 nm. The third order nonlinear absorption mechanism observed in Sr: SnO2 films were attributed to free carrier absorption (FCA) induced two-photon absorption (TPA). The third order nonlinear absorption co-efficient βeff shows a one order enhancement (0.14 × 10−1 cm/W to 3. 91 × 10−1 cm/W) which indicates that competency of grown films in nonlinear optical device applications.

Original languageEnglish
Pages (from-to)294-298
Number of pages5
JournalOptical Materials
Volume94
DOIs
Publication statusPublished - 01-08-2019

Fingerprint

Strontium
Tin oxides
strontium
tin oxides
Oxide films
Doping (additives)
Thin films
thin films
Spray pyrolysis
Surface analysis
assimilation
Point defects
Oxygen vacancies
Optical devices
diffraction
Crystal lattices
Band structure
point defects
pyrolysis
energy bands

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Computer Science(all)
  • Atomic and Molecular Physics, and Optics
  • Spectroscopy
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry
  • Electrical and Electronic Engineering

Cite this

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title = "Improved nonlinear absorption mechanism of tin oxide thin films: Role of strontium doping",
abstract = "We report the effect of strontium doping on third-order nonlinear optical properties of tin oxide (SnO2) thin films grown via chemical spray pyrolysis technique. The X-ray diffraction (XRD) results reveal that films exhibit a polycrystalline phase with a tetragonal crystal structure. The broadening and shifting of diffraction peak indicate that the dopant Sr2+ ion successfully replaced the Sn sites of SnO2 lattice. The reduction of crystalline size from 23.92 to 12.96 nm indicates the assimilation of point defects such as interstitial and oxygen vacancies in the SnO2 lattice upon doping. The surface morphological analysis via atomic force microscopy indicates the shattering of grains into small particles upon Sr doping. The energy band gap of films shows a substantial drop from 3.97eV to 3.03eV due to the formation of sub-band levels in the forbidden gap. Photoluminescence (PL) spectra show intense, broad asymmetric emission bands centred around 390 nm and extending up to 500 nm. The third order nonlinear absorption mechanism observed in Sr: SnO2 films were attributed to free carrier absorption (FCA) induced two-photon absorption (TPA). The third order nonlinear absorption co-efficient βeff shows a one order enhancement (0.14 × 10−1 cm/W to 3. 91 × 10−1 cm/W) which indicates that competency of grown films in nonlinear optical device applications.",
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Improved nonlinear absorption mechanism of tin oxide thin films : Role of strontium doping. / Bannur, M. S.; Antony, Albin; Maddani, K. I.; Ani, Aninamol; Poornesh, P.; Rao, Ashok; Choudhari, K. S.; Kulkarni, Suresh D.

In: Optical Materials, Vol. 94, 01.08.2019, p. 294-298.

Research output: Contribution to journalArticle

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T1 - Improved nonlinear absorption mechanism of tin oxide thin films

T2 - Role of strontium doping

AU - Bannur, M. S.

AU - Antony, Albin

AU - Maddani, K. I.

AU - Ani, Aninamol

AU - Poornesh, P.

AU - Rao, Ashok

AU - Choudhari, K. S.

AU - Kulkarni, Suresh D.

PY - 2019/8/1

Y1 - 2019/8/1

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AB - We report the effect of strontium doping on third-order nonlinear optical properties of tin oxide (SnO2) thin films grown via chemical spray pyrolysis technique. The X-ray diffraction (XRD) results reveal that films exhibit a polycrystalline phase with a tetragonal crystal structure. The broadening and shifting of diffraction peak indicate that the dopant Sr2+ ion successfully replaced the Sn sites of SnO2 lattice. The reduction of crystalline size from 23.92 to 12.96 nm indicates the assimilation of point defects such as interstitial and oxygen vacancies in the SnO2 lattice upon doping. The surface morphological analysis via atomic force microscopy indicates the shattering of grains into small particles upon Sr doping. The energy band gap of films shows a substantial drop from 3.97eV to 3.03eV due to the formation of sub-band levels in the forbidden gap. Photoluminescence (PL) spectra show intense, broad asymmetric emission bands centred around 390 nm and extending up to 500 nm. The third order nonlinear absorption mechanism observed in Sr: SnO2 films were attributed to free carrier absorption (FCA) induced two-photon absorption (TPA). The third order nonlinear absorption co-efficient βeff shows a one order enhancement (0.14 × 10−1 cm/W to 3. 91 × 10−1 cm/W) which indicates that competency of grown films in nonlinear optical device applications.

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