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Pregled bibliografske jedinice broj: 775541

Refined analysis of absorption spectra of CdS thin films


Novkovski, Nenad; Tanusevski, Atanas; Gracin, Davor
Refined analysis of absorption spectra of CdS thin films // Journal of physics. D, Applied physics, 48 (2015), 395105-1 doi:10.1088/0022-3727/48/39/395105 (međunarodna recenzija, članak, znanstveni)


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Naslov
Refined analysis of absorption spectra of CdS thin films

Autori
Novkovski, Nenad ; Tanusevski, Atanas ; Gracin, Davor

Izvornik
Journal of physics. D, Applied physics (0022-3727) 48 (2015); 395105-1

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
cadmium sulfide; optical absorption spectra; interband electronic transitions; fundamental absorption edge

Sažetak
We demonstrate that optical absorption spectra of CdS thin flms in the visible/near ultraviolet range can be precisely described by four different contributions of electron transitions from Γ points of three branches of the valence band maxima (Γ7, Γ in the conduction band (Γe, Γe′), in accordance with the theoretical results of the work (Lew Yan Voon et al 1996 Phys. Rev. B 53 10703). By using the method of successive extractions of different contributions in the absorption coeffcient (α), four contributions have been found, attributed to the following electron transitions: (Γ7′ → Γe), (Γ9 → Γe), (Γ7 → Γe) and (Γ → Γ Corresponding bandgaps for flms annealed at 400 °C in CdCl2 obtained in this work are Printed in the UK 9, Γ 7′, ) to the lowest two minima JPD 10.1088/0022-3727/48/39/395105 Papers 7 e′). 2.20 eV, 2.30 eV, 2.43 eV and 3.88 eV, that are close to the theoretical values for bulk CdS 2.24 of the confnement effect in microcrystals of a smaller size. For the flms annealed in air due to creation of Cd vacancies, the bandgap decreases down from the bulk values ; thus, the values of bandgaps for flms annealed at 400 °C in air are: 1.82 eV, 2.11 eV, 2.25 eV and 3.87 eV. eV, 2.28 eV, 2.43 eV and 3.8 eV. Bandgaps for as grown flms are somehow higher because 0022-3727 39 Strong absorption onset, considered as the fundamental absorption edge, corresponds to direct allowed transitions (Γ7 → Γe′) at photon energies of about 3.8 eV. Absorption due to direct allowed transitions (Γ7 → Γe) at photon energies of about 2.3 eV are usually reported as the optical bandgap of CdS saturates at relatively low values α ≈ 5 × 10 cm −1 4 .

Izvorni jezik
Engleski

Znanstvena područja
Fizika



POVEZANOST RADA


Ustanove:
Institut "Ruđer Bošković", Zagreb

Profili:

Avatar Url Davor Gracin (autor)

Citiraj ovu publikaciju

Novkovski, Nenad; Tanusevski, Atanas; Gracin, Davor
Refined analysis of absorption spectra of CdS thin films // Journal of physics. D, Applied physics, 48 (2015), 395105-1 doi:10.1088/0022-3727/48/39/395105 (međunarodna recenzija, članak, znanstveni)
Novkovski, N., Tanusevski, A. & Gracin, D. (2015) Refined analysis of absorption spectra of CdS thin films. Journal of physics. D, Applied physics, 48, 395105-1 doi:10.1088/0022-3727/48/39/395105.
@article{article, year = {2015}, pages = {395105-1-395105-9}, DOI = {10.1088/0022-3727/48/39/395105}, keywords = {cadmium sulfide, optical absorption spectra, interband electronic transitions, fundamental absorption edge}, journal = {Journal of physics. D, Applied physics}, doi = {10.1088/0022-3727/48/39/395105}, volume = {48}, issn = {0022-3727}, title = {Refined analysis of absorption spectra of CdS thin films}, keyword = {cadmium sulfide, optical absorption spectra, interband electronic transitions, fundamental absorption edge} }
@article{article, year = {2015}, pages = {395105-1-395105-9}, DOI = {10.1088/0022-3727/48/39/395105}, keywords = {cadmium sulfide, optical absorption spectra, interband electronic transitions, fundamental absorption edge}, journal = {Journal of physics. D, Applied physics}, doi = {10.1088/0022-3727/48/39/395105}, volume = {48}, issn = {0022-3727}, title = {Refined analysis of absorption spectra of CdS thin films}, keyword = {cadmium sulfide, optical absorption spectra, interband electronic transitions, fundamental absorption edge} }

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus


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