Phase separation phenomena in Sn-Sb-Se glassy semiconductors

Kumar, Praveen; Kumar, J.; Thangaraj, R.

doi:10.1051/epjap:2007054

Cited by 10 publications

(5 citation statements)

References 18 publications

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“…The addition of Sn inhibits the crystallization of the Sb 2 Se 3 phase in the Sn-Sb-Se system, and results in the formation of glassy alloys [5]. The transformation from the crystalline to amorphous nature of the bulk alloys has not been understood properly, although some electrical, optical properties and the effect of phase separation in this ternary system have already been discussed [6,7]. In the present study, an attempt has been made to elucidate the structure from the far-infrared spectrum for Sn substituted Sb 20 Se 80 films.…”

Section: Introductionmentioning

confidence: 99%

Effect of Sn addition on the optical gap and far-infrared reflectivity spectra of amorphous Sb–Se films

Kumar

Thangaraj

Sathiaraj

2010

Journal of Non-Crystalline Solids

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Section: Introductionmentioning

confidence: 99%

Effect of Sn addition on the optical gap and far-infrared reflectivity spectra of amorphous Sb–Se films

Kumar

Thangaraj

Sathiaraj

2010

Journal of Non-Crystalline Solids

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“…The segregation of the peak at 2θ = 15.0 • for x = 11 into two new peaks at 2θ = 14.4668 (SnSe 2 ) and 15.0613 (Sb 2 Se 3 ) and dominant peaks for new phases Sn 2 Sb 4 Se 8 (16.8588) and Sn 4 Sb 4 Se 10 (23.8177, 31.1485) have been revealed for x = 12.5 films. Phase separation occurring in a narrow composition window were discussed elsewhere with a broadening of exothermic peaks for bulk powdered samples [5]. However, the increase in Sn content leads to a decrease in glass transition temperature and thermal stability for bulk glasses.…”

Section: Structure Of Thin Filmsmentioning

confidence: 95%

“…Bulk glasses of the Sn x Sb 20 Se 80−x (x = 10, 11, 12.5) system were prepared by the conventional melt quenching technique [5].…”

Section: Methodsmentioning

confidence: 99%

“…The change in structural disorder with phase separation leads to a change in electronic structure of the material. Investigation of the glass forming region and composition dependence of some physical properties of the Sn-Sb-Se system has increased recent interest due to its probable application for optical power transmission devices in the far-IR region [5,6]. This system undergoes phase separation that occurs very near to the rigidity percolation threshold (Z > 2.40) [5].…”

Section: Introductionmentioning

confidence: 99%

“…Investigation of the glass forming region and composition dependence of some physical properties of the Sn-Sb-Se system has increased recent interest due to its probable application for optical power transmission devices in the far-IR region [5,6]. This system undergoes phase separation that occurs very near to the rigidity percolation threshold (Z > 2.40) [5]. This is supposed to create new defect states in the mobility gap with a change in short/medium range order.…”

Section: Introductionmentioning

confidence: 99%

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Effect of phase separation on the kinetics of photocurrent relaxation in Sn–Sb–Se glassy films

Kumar¹,

Thangaraj²

2009

J. Phys.: Condens. Matter

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The effects of phase separation on the structure and photoconductivity kinetics in Sn(x)Sb(20)Se(80-x) (x = 10,11,12.5) glassy films have been studied. Crystalline peaks for SnSe(2), Sn(2)Sb(4)Se(8) and Sn(4)Sb(4)Se(10) phases are found in x = 12.5 films, while Sb(2)Se(3) is the other major phase revealed from x-ray diffraction studies. The optical gap remains constant at 1.55 eV for x = 10,11 samples and then decreases to 1.50 eV for the x = 12.5 film, while a blueshift in reflectivity maxima (R(max)) has been observed with Sn content. An increase in room temperature conductivity and a decrease in dc activation energy with Sn content have been observed. Bimolecular recombination is the dominant recombination process under steady state illumination for all of the samples. Decay of photocurrent (after cessation of light) fits well to a stretched exponential function; the decay time constant and dispersion parameter have been discussed. The growth of network connectivity with an increase in compositional/configurational disorder induces states in the mobility gap and affects the structure of band tails. These results have been interpreted in the light of the barrier cluster model developed for chalcogenide glasses.

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Effect of phase separation on optical and electrical properties of Sn–Sb–Se glassy films

Kumar

Thangaraj

Sathiaraj

2009

Physica Status Solidi (a)

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This paper reports the effect of phase separation on the structural, optical and electrical properties of thermally evaporated Snx Sb20Se70–x (x = 10, 11, 12.5) films. The X‐ray diffraction studies of the devitrified films show the crystallization of SnSe2, Sn2Sb4Se8 and Sn4Sb4Se10 phases for x = 12.5 film, while Sb2Se3 is the other major phase in all the film samples. The optical constants are calculated by using Swanpole's standard envelop method. The dispersion of the refractive index is discussed in terms of the Cauchy's dispersion relation and the Wample–DiDomenico (WDD) single‐oscillator model in the weak absorption region. The optical gap and the tailing parameter were calculated in the fundamental absorption region, while the Urbach energy was calculated by using the value of extinction coefficients. The dc conductivity measurements with temperature have also been performed and electrical conduction has been discussed in conjunction with the Meyer–Neldel rule for the present system. These results have been discussed taking into consideration the structural modifications induced by the phase separation in the present system. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Phase separation phenomena in Sn-Sb-Se glassy semiconductors

Cited by 10 publications

References 18 publications

Effect of Sn addition on the optical gap and far-infrared reflectivity spectra of amorphous Sb–Se films

Effect of Sn addition on the optical gap and far-infrared reflectivity spectra of amorphous Sb–Se films

Effect of phase separation on the kinetics of photocurrent relaxation in Sn–Sb–Se glassy films

Effect of phase separation on optical and electrical properties of Sn–Sb–Se glassy films

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