Photoconductivity in Tl<sub>4</sub>S<sub>3</sub> layered single crystals

Ashraf, I.M.; Elshaikh, H. A.; Badr, A. M.

doi:10.1002/crat.200310150

Cited by 35 publications

(16 citation statements)

References 19 publications

(22 reference statements)

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“…The optical absorption studies of Tl 2 S have been investigated by Estrella et al [9] and suggest that there are direct forbidden transitions with a band gap of 1.12 eV. Characteristics of photoconductivity in Tl 2 S layered single crystals have been reported in our paper [10], and the same studies for Tl 4 S 3 have been reported in our paper [11].…”

Section: Am Badrsupporting

confidence: 80%

Characteristics of Optical and Photoconductive Properties in Bulk and Thin Film of TlS₂Single Crystals

Badr

2007

Acta Phys. Pol. A

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The photoconductivity measurements were carried out for bulk single crystals of TlS2 by using the steady state (dc) method in order to elucidate the nature of the dc photoconductivity in these crystals. The photoconductivity measurements were carried out in the temperature range of 77-300 K, excitation intensity range of 2150-5050 lx, applied voltage range of 10-25 V, and wavelength range of 400-915 nm. As a result of the dc photoconductivity, the temperature dependence of the energy gap width was described and the temperature coefficient of the band gap was determined. Reflectance and transmittance spectra of the TlS2 thin films were measured in the incident photon energy range of 2.1-2.45 eV and in the temperature range of 77-300 K. With the aid of these spectra, the temperature dependence of optical transports and parameters were elucidated. In the low energy region of the studied incident photon energy range, the above-mentioned spectra were analyzed for describing the refractive index as a function of wavelength. As results of the refractive index-wavelength variations, both the oscillator and dispersion energies of the refractive index were thereafter estimated.

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Section: Am Badrsupporting

confidence: 80%

Characteristics of Optical and Photoconductive Properties in Bulk and Thin Film of TlS₂Single Crystals

Badr

2007

Acta Phys. Pol. A

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“…As intense light falls on the sample, the lifetime decreases [24]. In Stockmann model, a two level scheme is proposed to explain negative photoconductivity [25].…”

Section: Characterizationmentioning

confidence: 99%

Crystal growth, optical, mechanical and electrical properties of organic NLO material γ-glycine

Ambujam¹,

Selvakumar²,

Anand³

et al. 2006

Cryst. Res. Technol.

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Single crystals of organic non-linear optical material, γ-glycine have been grown by gel method for the first time. The γ -phase is confirmed by single crystal XRD. The presence of various functional groups of γ-glycine are confirmed by FTIR. The UV-Vis-NIR spectrum reveals the high percentage of transmission of the sample in the entire visible region. The SHG of γ-glycine is confirmed by Kurtz powder technique. TGA-DTA studies indicate that the crystal is structurally stable upto 170 o C. Microhardness investigations are conducted on the grown crystals. The dielectric constant measurements are carried out and the nature of variation of dielectric constant ε΄ and dielectric loss D in the frequency range of 50 Hz to 5 MHz is studied and reported. Photoconductivity studies of γ-glycine crystals revealed the negative photoconducting nature.

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“…As intense light falls on the sample, the lifetime decreases [21]. In Stockmann model, a two level scheme is proposed to explain negative photoconductivity [22].…”

Section: Characterizationmentioning

confidence: 99%

Growth and characterization of dichloro tetrakis thiourea nickel single crystals

Ambujam¹,

Thomas²,

Aruna³

et al. 2006

Cryst. Res. Technol.

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Thiourea has a large dipole moment and has an ability to form extensive network of hydrogen bonds. In the course of our studies on new semiorganic NLO materials, thiourea is selected to combine with nickel chloride. Single crystals of tetrakis thiourea nickel chloride are grown using silica gel. Green transparent crystals of NTC (nickel thiourea chloride) of dimension 8x4x3 mm 3 are grown in a period of 45 days. Single crystal XRD shows that the crystal belongs to body centered tetragonal symmetry class I4. The UV-Vis-NIR spectrum establishes the transmission range to be 300 nm to 2500 nm, with a sharp absorption peak at the red end of the visible region, which is due to the colour of the crystal. Photoconductivity and dielectric studies are also carried out. The mechanical strength of the crystal is estimated by Vickers hardness test. The crystal starts decomposing after about 200°C. Thus, we confirm from our present investigation that NTC is a suitable candidate for NLO applications.

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Photoconductivity in Tl₄S₃ layered single crystals

Cited by 35 publications

References 19 publications

Characteristics of Optical and Photoconductive Properties in Bulk and Thin Film of TlS₂Single Crystals

Characteristics of Optical and Photoconductive Properties in Bulk and Thin Film of TlS₂Single Crystals

Crystal growth, optical, mechanical and electrical properties of organic NLO material γ-glycine

Growth and characterization of dichloro tetrakis thiourea nickel single crystals

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Photoconductivity in Tl4S3 layered single crystals

Cited by 35 publications

References 19 publications

Characteristics of Optical and Photoconductive Properties in Bulk and Thin Film of TlS2Single Crystals

Characteristics of Optical and Photoconductive Properties in Bulk and Thin Film of TlS2Single Crystals

Crystal growth, optical, mechanical and electrical properties of organic NLO material γ-glycine

Growth and characterization of dichloro tetrakis thiourea nickel single crystals

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Photoconductivity in Tl₄S₃ layered single crystals

Characteristics of Optical and Photoconductive Properties in Bulk and Thin Film of TlS₂Single Crystals

Characteristics of Optical and Photoconductive Properties in Bulk and Thin Film of TlS₂Single Crystals