Excitonic thermoreflectance of CdS

Iliev, M. N.; Assenov, I.

doi:10.1002/pssb.19700420139

Cited by 7 publications

(2 citation statements)

References 8 publications

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“…There have been many reports on the optical properties and constants of w-CdS studied using various techniques, such as absorption, 6-9 reflectivity, 8,10-15 photoluminescence, 16 refractive-index measurement, [17][18][19][20] and spectroellipsometry. 20 Some modulation techniques, such as ER, 21,22 TR, [23][24][25] wavelength-modulated reflectance, 26 and PzR, 27,28 have also been employed to investigate the CP structures in w-CdS. However, there has been no data on the PR spectra of w-CdS.…”

Section: Introductionmentioning

confidence: 97%

Photoreflectance spectroscopy of wurtzite CdS

Imada

Ozaki

Adachi

2002

Journal of Applied Physics

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Photoreflectance (PR) spectra have been measured to determine the lowest direct-band edge E0α (α=A, B, and C) of wurtzite CdS single crystal in the temperature range T=13–300 K for both E⊥c and E∥c polarizations. The measured PR spectra can be interpreted by the three-dimensional (3D) excitonic plus one-electron line shapes over the entire temperature range. The temperature dependence of the excitonic and critical-point parameters (energy, amplitude, and broadening parameter) have been determined and analyzed using the Varshni [Physica (Amsterdam) 34, 149 (1967)] equation and an analytical four-parameter expression recently developed for the explanation of the band-gap shrinkage effect in semiconductors. The 3D- exciton binding energies have also been determined to be 27 (A), 31 (B), and 30 meV (C), respectively.

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Section: Introductionmentioning

confidence: 97%

Photoreflectance spectroscopy of wurtzite CdS

Imada

Ozaki

Adachi

2002

Journal of Applied Physics

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“…The samples were high-resistive platelets grown by the Frerichs method. The experimental set-up and the modulation method were described elsewhere (3). The frequency of the heating impulses was 1.8 Hz.…”

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Determination of the exciton parameters of CdSe from thermoreflectance measurements

Iliev

Baleva

1971

Physica Status Solidi (b)

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Determination of the Exciton Parameters of CdSe from Thermoreflectance Measurements BY M. ILIEV and M. BALEVARecently, a number of papers appeared on the differential thermoreflectance 2 6 (TR) of A B compounds (1 to 4). The general conclusion is that a t sufficiently low temperatures the experimentally observed structure of the relative changes of reflectivity near the fundamental absorption edge is due mainly to exciton effects. This provides a basis for the determination of the exciton parameters as the complex dielectric function c = e + i e2 (n + ik)2 = F(w , T ) is known in a good approximation near the discrete exciton states (5). The results of such determination for CdSe at 110 OK are presented in this paper.

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Thermo‐absorption of CdS and CdSe in the exciton absorption region

Lange

1971

Physica Status Solidi (b)

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The thermal modulation method has been frequently applied to the study of the optical properties of solids (see e. g. (1)). In the present note measurements of the thermo-absorption of very thin CdS and CdSe single crystals are reported in order to find out which information can be gained from this type of spectra in comparison with dtz/do spectra.shaped with an area of 2x3 mm and a thickness of (3 to ~) x I O -~ cm. The crystals were mounted in a Dewar vessel and cooled to liquid nitrogen. Heating of the samples was performed either by directly passing a current through the sample between evaporated electrodes or by indirect heating placing the crystal between mica sheets covered with Sn02. The pulses applied to the sample had a frequency of 10 Hz. The temperature of the various samples was in the range around 90 K, as determined from the energetic position of the exciton lines, using the results of

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Excitonic thermoreflectance of CdS

Cited by 7 publications

References 8 publications

Photoreflectance spectroscopy of wurtzite CdS

Photoreflectance spectroscopy of wurtzite CdS

Determination of the exciton parameters of CdSe from thermoreflectance measurements

Thermo‐absorption of CdS and CdSe in the exciton absorption region

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