Effect of Thermal Annealing on the Band GAP and Optical Properties of Chemical Bath Deposited ZnSe Thin Films

F. İ. EZEMA; A. B. C. Ekwealor And R. U. OSUJI

Makale detayları

Effect of Thermal Annealing on the Band GAP and Optical Properties of Chemical Bath Deposited ZnSe Thin Films

Yazarlar:

F. İ. EZEMA | A. B. C. Ekwealor And R. U. OSUJI

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Physics 2006 Vol.30 Issue 3, pp.157-163

Belge Tipi:

Makale

Yayın Tarihi:

2/2006

Belge Dili:

Türkçe

Document ID (Org No.):

2000761365

Sıklık:

İki Aylık

eISSN:

1303-6122

pISSN:

1300-0101

Anahtar kelimeler:

Özet:

 

Zinc selenide (ZnSe) thin films were deposited on glass  substrate using the chemical bath deposition method at room  temperature from aqueous solutions of zinc sulphate and sodium  selenosulfate in which sodium hydroxide was employed as complexing  agents.  The as−deposited'ZnSeth∈filmsarered∈a∩ea≤d∈ovenat473Kfor1hourandonahotplate∈openairat333Kfor5minutes,affect∈gthemorphologicalandoptical∝erties.Optical∝ertiessuchas|or|ptioncoefficientaandext∈ctioncoefficientk,weredeterminedusingthe|or|banceandtransmissionmeasurementomUnicoUV−2102PCspectropho→meter,at∥a∥l∈cnceoflight∈thewave≤n>hran≥of200−1000nm.Thefilmshavetransmiance∈VIS−NIRregionstˆran≥between26and87%.From|or|banceandtransmiancespectra,thebandgape≠rgydeterminedran≥dbetween1.60eVand1.75fortheas-deposited′ZnSeth∈filmsarered∈a∩ea≤d∈ovenat473Kfor1hourandonahotplate∈openairat333Kfor5minutes,affect∈gthemorphologicalandoptical∝erties.Optical∝ertiessuchas|or|ptioncoefficientaandext∈ctioncoefficientk,weredeterminedusingthe|or|banceandtransmissionmeasurementomUnicoUV-2102PCspectropho→meter,at∥a∥l∈cnceoflight∈thewave≤n>hran≥of200-1000nm.Thefilmshavetransmiance∈VIS-NIRregionstr^an≥between26and87%.From|or|banceandtransmiancespectra,thebandgape≠rgydeterminedran≥dbetween1.60eVand1.75fortheas-deposited' ZnSe thin films are red in color and  annealed in oven at 473 K for 1 hour and on a hot plate in open air at  333 K for 5 minutes, affecting the morphological and optical  properties.  Optical properties such as absorption coefficient a  and extinction coefficient k, were determined using the absorbance and  transmission measurement from Unico UV-2102 PC spectrophotometer, at  normal incidence of light in the wavelength range of 200-1000 nm.   The films have transmittance in VIS-NIR regions that range between 26  and 87%.  From absorbance and transmittance spectra, the band gap  energy determined ranged between 1.60 eV and 1.75 for the as  deposited' samples, and the annealed samples exhibited a band gap  shift of 0.15 eV. The high transmittance of the films together with  its large band gap made them good materials for selective coatings for  solar cells.

 

Zinc selenide (ZnSe) thin films were deposited on glass  substrate using the chemical bath deposition method at room  temperature from aqueous solutions of zinc sulphate and sodium  selenosulfate in which sodium hydroxide was employed as complexing  agents.  The as−deposited'ZnSeth∈filmsarered∈a∩ea≤d∈ovenat473Kfor1hourandonahotplate∈openairat333Kfor5minutes,affect∈gthemorphologicalandoptical∝erties.Optical∝ertiessuchas|or|ptioncoefficientaandext∈ctioncoefficientk,weredeterminedusingthe|or|banceandtransmissionmeasurementomUnicoUV−2102PCspectropho→meter,at∥a∥l∈cnceoflight∈thewave≤n>hran≥of200−1000nm.Thefilmshavetransmiance∈VIS−NIRregionstˆran≥between26and87%.From|or|banceandtransmiancespectra,thebandgape≠rgydeterminedran≥dbetween1.60eVand1.75fortheas-deposited′ZnSeth∈filmsarered∈a∩ea≤d∈ovenat473Kfor1hourandonahotplate∈openairat333Kfor5minutes,affect∈gthemorphologicalandoptical∝erties.Optical∝ertiessuchas|or|ptioncoefficientaandext∈ctioncoefficientk,weredeterminedusingthe|or|banceandtransmissionmeasurementomUnicoUV-2102PCspectropho→meter,at∥a∥l∈cnceoflight∈thewave≤n>hran≥of200-1000nm.Thefilmshavetransmiance∈VIS-NIRregionstr^an≥between26and87%.From|or|banceandtransmiancespectra,thebandgape≠rgydeterminedran≥dbetween1.60eVand1.75fortheas-deposited' ZnSe thin films are red in color and  annealed in oven at 473 K for 1 hour and on a hot plate in open air at  333 K for 5 minutes, affecting the morphological and optical  properties.  Optical properties such as absorption coefficient a  and extinction coefficient k, were determined using the absorbance and  transmission measurement from Unico UV-2102 PC spectrophotometer, at  normal incidence of light in the wavelength range of 200-1000 nm.   The films have transmittance in VIS-NIR regions that range between 26  and 87%.  From absorbance and transmittance spectra, the band gap  energy determined ranged between 1.60 eV and 1.75 for the as  deposited' samples, and the annealed samples exhibited a band gap  shift of 0.15 eV. The high transmittance of the films together with  its large band gap made them good materials for selective coatings for  solar cells.

Makale detayları

Effect of Thermal Annealing on the Band GAP and Optical Properties of Chemical Bath Deposited ZnSe Thin Films

Yazarlar:

F. İ. EZEMA | A. B. C. Ekwealor And R. U. OSUJI

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Physics 2006 Vol.30 Issue 3, pp.157-163

Belge Tipi:

Makale

Yayın Tarihi:

2/2006

Belge Dili:

Türkçe

Document ID (Org No.):

2000761365

Sıklık:

İki Aylık

eISSN:

1303-6122

pISSN:

1300-0101

Chemical bath Deposition

ZnSe Thin film

band gap

Solar Cells.

Sayı

Makale detayları

Effect of Thermal Annealing on the Band GAP and Optical Properties of Chemical Bath Deposited ZnSe Thin Films

Yazarlar: F. İ. EZEMA | A. B. C. Ekwealor And R. U. OSUJI

Yayıncı: TUBITAK

Dergi: Turkish Journal of Physics 2006 Vol.30 Issue 3, pp.157-163

Belge Tipi: Makale

Yayın Tarihi: 2/2006

Belge Dili: Türkçe

Document ID (Org No.): 2000761365

Sıklık: İki Aylık

eISSN: 1303-6122

pISSN: 1300-0101

Chemical bath Deposition

ZnSe Thin film

band gap

Solar Cells.

Sayı

Yazarlar:

F. İ. EZEMA | A. B. C. Ekwealor And R. U. OSUJI

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Physics 2006 Vol.30 Issue 3, pp.157-163

Belge Tipi:

Makale

Yayın Tarihi:

2/2006

Belge Dili:

Türkçe

Document ID (Org No.):

2000761365

Sıklık:

İki Aylık

eISSN:

1303-6122

pISSN:

1300-0101