Analysis of PV deposited ZnTe thin films through Urbach tail and photoluminescence spectroscopy

Keshav, Rashmitha; Padiyar, Meghavarsha; N, Meghana; Mahesha, M.G.

doi:10.1016/j.jlumin.2017.10.047

Cited by 25 publications

(16 citation statements)

References 20 publications

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“…The (111) peak is found to be the main one observed at 25.36, 25.45, and 25.26 degrees for the S0, S30, and S50 samples, respectively. Similar behavior reported in reference [34]. The other peaks; (220), (311), (331), (422), and (511), are comparatively less intense.…”

Section: Structural Studiessupporting

confidence: 86%

An investigation on structural and optical properties of nanocolumnar ZnTe thin films grown by glancing angle technique

Zarei

Ehsani

Dizaji

2020

Mater. Res. Express

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In this paper, Zinc Telluride (ZnTe) thin films have been deposited on glass substrate by glancing angle deposition (GLAD) technique at different flux angles. The structural and optical properties of the prepared specimens have been studied with the help of x-ray diffraction (XRD), FESEM, and UV-vis analyses, respectively. According to these tests, remarkable changes in the morphology and the structure of the as-prepared samples have occurred. More significantly, using UV-vis analysis the optical properties including refractive index and band gap energy of the samples have been modified at higher deposition angles, which are promising to be applicable in optoelectronic devices.

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Section: Structural Studiessupporting

confidence: 86%

An investigation on structural and optical properties of nanocolumnar ZnTe thin films grown by glancing angle technique

Zarei

Ehsani

Dizaji

2020

Mater. Res. Express

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“…A strong correlation between the E u and E g values was observed in the spectral shift that occurred after the incorporation of the CsPbBr 3 -QDs. This correlation showed that the transitions across the bandgap and the transitions responsible for the Urbach edge are both electronic transitions, which has been the main focus of previous publications [28,43]. Additionally, one peak at 507 nm and shoulder at 551 nm were observed for the PQDs and MEH-PPV, respectively.…”

Section: Optical Analysismentioning

confidence: 52%

“…where λ is the wavelength of the X-ray source, θ is the Bragg angle, and β is the full width at half maximum of the observed peak [28]. The addition of PQDs of various weight ratios significantly influenced the hybrid films' structures and increased the grain size of the composite, which had been previously predicted using the increasing intensity of the (202) peak in the XRD diffraction studies.…”

Section: Structural Characteristicsmentioning

confidence: 76%

“…The dependence of the steepness parameter on the PQDs content in the composite thin films at room temperature is shown in Figure 6b. Here, a decrease in the E u value or an increase in the σ upon incremental addition of the CsPbBr 3 -QDs was attributed to a decrease in the localized density of the electronic states within the forbidden bandgap of the hybrids [28,39]. If the k-vector (momentum) of the minimal energy state in the CB and the maximal energy state in the VB are the same, the bandgap is defined as a "direct gap" transition.…”

Section: Optical Analysismentioning

confidence: 99%

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Tuning the Optical Properties of MEH–PPV/PFO Hybrid Thin Films via the Incorporation of CsPbBr3 Quantum Dots

et al. 2021

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The current work examines the effects of cesium lead bromide (CsPbBr3) perovskite quantum dots (PQDs) on the structural and optical properties of conjugated polymer blends of poly[2-methoxy-5-(2′-ethylhexyloxy)-1,4-phenylene vinylene] (MEH–PPV) and poly(9,9-di-n-octylfluorenyl-2,7-diyl) (PFO). MEH–PPV/PFO composite thin-films containing PQDs with weight ratios between 0.5 wt.% and 10 wt.% were prepared via a solution-blending method prior to spin-coating on glass substrates. The MEH–PPV/PFO composites’ crystallinity was improved, and the roughness was dramatically increased with higher PQDs content, as confirmed by X-ray diffraction (XRD) and atomic force microscopy (AFM), respectively. Conversely, a higher PQDs content resulted in a gradual reduction of the Urbach tail and an increase in the steepness parameter, thereby reducing the localized density of the electronic states within the forbidden bandgap of the hybrids. Moreover, a slight reduction in the direct and indirect bandgaps was found in PQDs/(MEH–PPV/PFO) composite films containing a higher PQDs content and provided evidence of the low concentration of the localized states. The incorporation of the PQDs resulted in enhanced non-radiative energy transfer processes in the MEH–PPV/PFO hybrids, which are very important for the development of optimized optoelectronic devices.

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“…Zinc Selenide (ZnSe) and Zinc Telluride (ZnTe) are important II-VI semiconductor materials with direct and wide band gap (2.82 eV-2.26 eV). These materials have many potential optoelectronics applications, such as photo detectors, solar cells, lasers [1][2][3][4][5][6][7][8][9][10][11]. A long range of techniques have been used to fabricate these materials as electrochemical deposition [5], molecular beam epitaxy (MBE) [2], mechanical ball milling and others [8,10].…”

Section: Introductionmentioning

confidence: 99%

Surfactant and dopant addition effect on optical and structural properties of ZnSe (Te) nanostructured semiconductors

Valluzzi

Darriba

et al. 2020

Journal of Alloys and Compounds

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Analysis of PV deposited ZnTe thin films through Urbach tail and photoluminescence spectroscopy

Cited by 25 publications

References 20 publications

An investigation on structural and optical properties of nanocolumnar ZnTe thin films grown by glancing angle technique

An investigation on structural and optical properties of nanocolumnar ZnTe thin films grown by glancing angle technique

Tuning the Optical Properties of MEH–PPV/PFO Hybrid Thin Films via the Incorporation of CsPbBr3 Quantum Dots

Surfactant and dopant addition effect on optical and structural properties of ZnSe (Te) nanostructured semiconductors

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