Disorder and optical absorption in amorphous silicon and amorphous germanium

O’Leary, Stephen K.; Żukotyński, S.; Perz, J. M.

doi:10.1016/s0022-3093(96)00612-6

Cited by 83 publications

(32 citation statements)

References 19 publications

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“…The optical band gaps of the lms change reversely with the Urbach energy values. This result causes a redistribution of states, such as from band to tail and tail to tail transitions [17] and in turn, the optical gap decreases due to the broadening of the Urbach tail. These results obtained for Bi doped ZnO are in agreement with the ndings obtained for other kind of impurities, such as Sn, F, Al, Er, Ta, In [16].…”

Section: Resultsmentioning

confidence: 99%

Optical and Structural Properties of Bismuth Doped ZnO Thin Films by Sol-Gel Method: Urbach Rule as a Function of Crystal Defects

Keskenler¹,

Aydın²,

Turgut³

et al. 2014

Acta Phys. Pol. A

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Bismuth (Bi) doped zinc oxide (ZnO:Bi) thin lms were prepared on glass substrates by solgel spin coating technique using homogeneous precursor solutions, and eects of Bi doping on the structural and optical properties of ZnO were investigated. The crystalline of ZnO lms shifted from polycrystalline nature to amorphous nature with Bi doping. The plane stresses (σ) for hexagonal ZnO and ZnO:Bi crystals were calculated according to the biaxial strain model. The Urbach rule was studied as a function of non-thermal component to the disorder (defects in crystal structures) which is especially observed in the case of non-crystal semiconductors. The calculated Urbach energies and steepness parameters of undoped ZnO and ZnO:Bi lms varied between 44.33 meV and 442.67 meV, and 58.3 × 10 −2 and 5.8 × 10 −2 , respectively. The Urbach energies of the lms increased with an increase in the Bi doping concentration and a great dierence was observed for 7.0 mol.% doping. The band gap values of the lms exhibited a uctuated behavior as a result of doping eect.

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Section: Resultsmentioning

confidence: 99%

Optical and Structural Properties of Bismuth Doped ZnO Thin Films by Sol-Gel Method: Urbach Rule as a Function of Crystal Defects

Keskenler¹,

Aydın²,

Turgut³

et al. 2014

Acta Phys. Pol. A

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show abstract

“…This increase leads to a redistribution of the states, from band to tail, thus allows for a greater number of possible bands to tail and tail to tail transitions [29]. As a result, both a decrease in the optical gap and a broadening of the Urbach tail have taken place.…”

Section: Resultsmentioning

confidence: 99%

Composition and Optical Dispersion Characterization of Nanoparticles ZnO-NiO Thin Films: Effect of Annealing Temperature

Oboudi

Habubi

Mohamed

et al. 2013

ILCPA

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Thin films of ZnO 0.7 NiO 0.3 have deposited on glass substrates at room temperature by using thermal evaporation technique under vacuum 10 -5 mbar. The optical properties and dispersion parameters of the films have been studied. Changes in direct optical energy band gap of films were confirmed before and after annealing. The optical energy gap E g decreased from 3.11 to 2.86 eV with increasing of annealing temperature to 200 ºC. Some of the optical absorption parameters, such as optical dispersion energies E o and E d , Urbach tails E U , dielectric constant ε, the average values of oscillator strength S o , and wavelength of single oscillator λ o have been reported. An increase in the annealing temperature causes an increase in the average oscillator strength from 62.02 to 87.71 eV.

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“…The decrease in E g is attributed to the increase of disorder of the material occurred by doping. This increase leads to a redistribution of states, from band to tail, thus allows for a greater number of possible bands to tail and tail to tail transitions [30]. As a result, both a decrease in the optical gap and a broadening of the Urbach tail occurred.…”

Section: Optical Properties Of the Fzo Thin Filmsmentioning

confidence: 99%

Structural, optical and electrical properties of F-doped ZnO nanorod semiconductor thin films deposited by sol–gel process

Ilıcan

Çağlar

et al. 2008

Applied Surface Science

169

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Disorder and optical absorption in amorphous silicon and amorphous germanium

Cited by 83 publications

References 19 publications

Optical and Structural Properties of Bismuth Doped ZnO Thin Films by Sol-Gel Method: Urbach Rule as a Function of Crystal Defects

Optical and Structural Properties of Bismuth Doped ZnO Thin Films by Sol-Gel Method: Urbach Rule as a Function of Crystal Defects

Composition and Optical Dispersion Characterization of Nanoparticles ZnO-NiO Thin Films: Effect of Annealing Temperature

Structural, optical and electrical properties of F-doped ZnO nanorod semiconductor thin films deposited by sol–gel process

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