Trap Level Measurements in Wide Band Gap Materials by Thermoluminescence

Saadatkia, Pooneh; Varney, C. R.; Selim, F. A.

doi:10.5772/65306

Cited by 4 publications

(3 citation statements)

References 103 publications

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“…Usually, these states are located at the center of the forbidden band (see Figure S2). Moreover, the possibility of obtaining localized states that do not participate in the recombination process also exists, which are identified as traps, either for electrons or holes, and tend to be strictly related to thermal stimulation . These traps are characterized by their effective capture cross-section (σ n ; σ h ).…”

Section: Resultsmentioning

confidence: 99%

Density Functional Evaluation of Catechol Adsorption on Pristine and Reduced TiO₂(B)(100) Ultrathin Sheets for Dye-Sensitized Solar Cell Applications

et al. 2022

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The introduction of defects is one of the most recurrent pathways to generate modifications to materials' electronic structure and surface reactivity. In this work, calculations based on the density functional theory (DFT) were applied to study the electronic properties of pristine and reduced TiO 2 (B)(100) ultrathin sheets to evaluate their potential as a semiconductor material for dye-sensitized solar cells (DSSCs). It was carried out by introducing vacancy defects on these surfaces and then adsorbing a catechol molecule, used as a model of a direct electron injection sensitizer (type-II dye), in different interaction configurations. Geometric, energetic, and electronic analyses were performed, focusing on the electronic structure changes and charge transfer between the dye and surface during molecular adsorption. The obtained results seem to indicate that a thickness of four layers is adequate to obtain a satisfactory slab model approximation of the TiO 2 (B)(100) surface. The presence of oxygen vacancy states among the majority of the reduced surfaces was observed as well as a reduction of the band gap energy value. Additionally, the adsorption of catechol in the reduced surface induced an increase in light absorption compared to the pristine model. These attributes suggest that reduced ultrathin sheets of TiO 2 (B) could be a suitable candidate as a photoelectrode for DSSC applications.

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Section: Resultsmentioning

confidence: 99%

Density Functional Evaluation of Catechol Adsorption on Pristine and Reduced TiO₂(B)(100) Ultrathin Sheets for Dye-Sensitized Solar Cell Applications

et al. 2022

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“…[30] Thermoluminescence (TL) is a perfect tool for dosimetry and dating applications (e.g., [31,32] ); it is also a great tool for the detection of traps and measuring their energy levels. [33,34] Other methods based on thermally stimulated processes such as thermally stimulated conductivity (TSC) and thermally stimulated polarization and depolarization current can be also used to measure the trap levels. [35,36] TL or TSL has been widely applied for measuring deep and relatively shallow traps in optical and photonic materials [37,38] and has been quite useful for optical studies of single crystals, films, phosphors, and transparent ceramics for lasers, scintillators, and solid-state lighting applications and more.…”

Section: Introductionmentioning

confidence: 99%

Advanced Thermoluminescence Spectroscopy as a Research Tool for Semiconductor and Photonic Materials: A Review and Perspective

Selim

2023

Physica Status Solidi (a)

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Thermoluminescence (TL) or thermally stimulated luminescence (TSL) spectroscopy is based on liberating charge carriers from traps in the bandgap by providing enough thermal energy to overcome the potential barrier of the traps. It provides a powerful tool to measure the positions of the localized states/traps in the bandgap. Despite that, its applications in semiconductors are very limited. Herein, the basics of TL spectroscopy and the recent advances in the technique with focus on cryogenic thermally stimulated photoemission spectroscopy (C‐TSPS) which extends TL measurements to cryogenic regime and allows the detection of very low concentrations of shallow and deep localized states is discussed. One goal herein is to introduce the reader to the use of TL and C‐TSPS in the characterization of semiconductors, explaining how it can be applied and demonstrating its advantages as a powerful tool for measuring shallow donor/acceptor ionization energies in semiconductors and as a method for characterizing compensating defects. The article also discusses interesting potential applications of C‐TSPS in new research areas such as corrosion and formation of oxide layers on metal surfaces.

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“…Figure 4(c) illustrates the extraction of thin-film E a .Through the linear fitting of the Arrhenius equation,26) …”

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confidence: 99%

Improved uniformity of xanthan gum resistive memory device by lowering activation energy

Chang¹,

Liu²,

Chang³

et al. 2023

Appl. Phys. Express

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In this study, the dielectric layer of the xanthan gum resistive memory is treated by air plasma. Compared with the untreated original device, when the device is treated with plasma for 30 s, the activation energy is reduced from 0.17 to 0.13 eV, which helps to control the randomness of the path of trap hopping conduction. Thus, the average set voltage is reduced from 1.05 to 0.54 V, which makes the filament grow more easily. The fluctuation of I HRS decreased from 88.88% to 49.56%. This means that the uniformity and stability of the device can be effectively improved by the plasma treatment.

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Trap Level Measurements in Wide Band Gap Materials by Thermoluminescence

Cited by 4 publications

References 103 publications

Density Functional Evaluation of Catechol Adsorption on Pristine and Reduced TiO₂(B)(100) Ultrathin Sheets for Dye-Sensitized Solar Cell Applications

Density Functional Evaluation of Catechol Adsorption on Pristine and Reduced TiO₂(B)(100) Ultrathin Sheets for Dye-Sensitized Solar Cell Applications

Advanced Thermoluminescence Spectroscopy as a Research Tool for Semiconductor and Photonic Materials: A Review and Perspective

Improved uniformity of xanthan gum resistive memory device by lowering activation energy

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Trap Level Measurements in Wide Band Gap Materials by Thermoluminescence

Cited by 4 publications

References 103 publications

Density Functional Evaluation of Catechol Adsorption on Pristine and Reduced TiO2(B)(100) Ultrathin Sheets for Dye-Sensitized Solar Cell Applications

Density Functional Evaluation of Catechol Adsorption on Pristine and Reduced TiO2(B)(100) Ultrathin Sheets for Dye-Sensitized Solar Cell Applications

Advanced Thermoluminescence Spectroscopy as a Research Tool for Semiconductor and Photonic Materials: A Review and Perspective

Improved uniformity of xanthan gum resistive memory device by lowering activation energy

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Density Functional Evaluation of Catechol Adsorption on Pristine and Reduced TiO₂(B)(100) Ultrathin Sheets for Dye-Sensitized Solar Cell Applications

Density Functional Evaluation of Catechol Adsorption on Pristine and Reduced TiO₂(B)(100) Ultrathin Sheets for Dye-Sensitized Solar Cell Applications