Radiative recombination mechanisms in CdTe thin films deposited by elemental vapor transport

Collins, S.; Vatavu, Sergiu; Evani, V.; Khan, Md. Shakhaoath; Bakhshi, Sara; Palekis, Vasilios; Rotaru, C.; Ferekides, C.S.

doi:10.1016/j.tsf.2014.11.088

Cited by 12 publications

(5 citation statements)

References 14 publications

(14 reference statements)

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“…The PL band with maximum at 1.600 eV covers the spectral range where both the impurity band in undoped GaTe crystals and free and localized exciton emission bands in CdTe are present . The forbidden bandwidth of CdTe crystals, at 80 K, is 1.595 eV and the excitonic Rydberg at 77 K is ∼10 meV . The latter energy is comparable with thermal energy.…”

Section: Resultsmentioning

confidence: 95%

Photoelectric and photoluminescence properties of CdTe–GaTe composite

Caraman

Spalatu

Evtodiev

et al. 2016

Physica Status Solidi (b)

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A GaTe-CdTe composite was obtained by thermal treatment at 1020 K of GaTe single crystals in Cd vapor atmosphere. The composite photoluminescence, photoconductivity, and composition are studied in this work. The photosensitivity and photoluminescence band structure are determined for both the primary crystals and the composite. The CdTe crystallites create, in the GaTe bandgap, recombination and trapping levels, which determine the structure of the photoluminescence spectra and the spectral range of composite photosensitivity. The photoluminescence spectrum of the composite at 80 K contains characteristic bands of both composite components, GaTe and CdTe. From the analysis of thermally stimulated luminescence curves, the energies of the electron trapping levels in the composite are determined.

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Section: Resultsmentioning

confidence: 95%

Photoelectric and photoluminescence properties of CdTe–GaTe composite

Caraman

Spalatu

Evtodiev

et al. 2016

Physica Status Solidi (b)

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“…Nowadays, insufficient attention is devoted to the question of smoothing of PL spectra. The smoothed PL spectra are adduced in works [6][7][8], however information about the way of this smoothing is absent. The works [9][10] perform the decomposition of PL spectra on elementary bands by means of mathematical packages, but smoothing is not shown in details and even the used way of it is not mentioned.…”

Section: Literature Reviewmentioning

confidence: 99%

“…offered smoothing method consists of the implementation of simple matrix operations corresponding to(7).…”

mentioning

confidence: 99%

Method of smoothing photoluminescence spectra

2018

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The smoothing method for experimental photoluminescence spectra, which uses Tikhonov regularization method, is proposed. Smoothing problem statement is performed as a statement of the minimization problem based on the least squares criterion. The functional to be minimized is a compound of two terms. The first one is the basic term, which determines the quality of data approximation provided by smooth function. The second one is the regularization term, which sets a constraint on the energy by smooth function derivative of a given order. A solution of the smoothing problem is obtained in the closed form analytically. The solution can be implemented by a simple array of matrix operations; one of those is an operation of matrix inversion. The necessity of matrix inversion imposes constraints on the order of derivative used in the proposed method and on noise level. It is related to the increase of either the order of derivative at the given noise level in data or the noise level at the given order of derivative, that deteriorates the conditionality of a matrix to be inverted and limits the scope of the proposed method, accordingly. Efficiency comparison of the proposed smoothing method, the Savitzky-Golay method, and the moving average method was performed by the numerical simulation of two models of photoluminescence spectra. Their advantages, disadvantages, and also the scopes of applicability are noted. The best values of operating parameters of these methods for the different noise levels in data were obtained. The conditions, under which the potential capabilities of the proposed smoothing method excel the potential possibilities of Savitzky-Golay method, were indicated. The results of smoothing the experimental photoluminescence spectra obtained for ZnO:Mn nanocrystals and ZnS:Mn crystals are provided.

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“…CdTe thin films can be prepared with various methods, such as near space sublimation [6], magnetron sputtering [7], vapor transport deposition [8], and so on. Among these methods, electrochemical deposition is considered to be an ideal method for mass production of CdTe films with easy operation and high material utilization [9,10].…”

Section: Introductionmentioning

confidence: 99%

Electrodeposition of CdTe Thin Films for Solar Energy Water Splitting

et al. 2020

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CdTe thin films have been prepared by electrochemical deposition. The morphological, structural, and optical properties of CdTe thin films deposited with different deposition time were investigated, and the influence of film thickness on the photoelectric characteristics of CdTe thin films was studied. At the deposition time of 1.5 h, CdTe thin films had good optical properties and the photocurrent reached 20 μAcm−2. Furthermore, the Pt/CdS/CdTe/FTO structure was prepared to improve its PEC stability and the photocurrent of 240 μAcm−2 had been achieved.

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Radiative recombination mechanisms in CdTe thin films deposited by elemental vapor transport

Cited by 12 publications

References 14 publications

Photoelectric and photoluminescence properties of CdTe–GaTe composite

Photoelectric and photoluminescence properties of CdTe–GaTe composite

Method of smoothing photoluminescence spectra

Electrodeposition of CdTe Thin Films for Solar Energy Water Splitting

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