Investigation of optical and electrical properties of erbium-doped TiO2 thin films for photodetector applications

Mondal, Sanjib; Ghosh, Anupam; Piton, Marcelo Rizzo; Gomes, Joaquim P.; Felix, Jorlandio F.; Gobato, Y. Galvão; Galeti, H. V. A.; Choudhuri, Bijit; Dwivedi, Shyam Murli Manohar Dhar; Henini, M.; Mondal, Aniruddha

doi:10.1007/s10854-018-0090-1

Cited by 21 publications

(7 citation statements)

References 47 publications

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“…Based on the PL data, the emission mechanism of the Erdoped TiO 2 is proposed in figure 5, in which the dotted line, straight line, wavy arrows, and curved arrows describe the excitations, emissions, non-radiative (NR) relaxations, and energy transfer processes, respectively. In addition, figure 5 also displays the splitting of the Er-ion energy levels due to the host crystal field [39]. Under a 325 nm-induced indirect excitation, known as a down-conversion process, the electrons in the valence band of the TiO 2 matrix are excited to the conduction band, where they eventually accumulate.…”

Section: Resultsmentioning

confidence: 99%

Studying the structural and optical properties of Er³⁺ doped TiO₂ powders synthesized by the sol-gel process

Le¹,

Tran²,

Cao³

et al. 2023

Adv. Nat. Sci: Nanosci. Nanotechnol.

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A series of TiO2:xEr powders (with x from 0% to 1% at.) was synthesised by a simple sol–gel process. The structural and optical properties were studied in detail using diffusion reflection spectroscopy, x-ray diffraction, Raman spectroscopy, high-resolution transmission electron microscopy, and energy-dispersive x-ray spectroscopy, to systematically determine the band edge, morphology, and structural properties of both undoped and Er-doped TiO2 samples. Notably, the introduction of Er dopants in the TiO2 matrix results in a decrease in both the band gap and crystallite size as well as the anatase phase of host matrix TiO2 remained in the anatase phase even at 800 °C. The heat treatment temperature has an insignificant effect on the green/red emission ratio of Er ions. However, this ratio strongly depends on excitation wavelengths corresponding to down-conversion and up-conversion processes. The colour emission of TiO2:Er is easily tunable from green to yellow under different excitations. The emission mechanism of TiO2:Er is proposed based on spectroscopy techniques. These findings reveal that the TiO2:Er powders are potential materials for labelling and photocatalyst applications.

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Section: Resultsmentioning

confidence: 99%

Studying the structural and optical properties of Er³⁺ doped TiO₂ powders synthesized by the sol-gel process

Le¹,

Tran²,

Cao³

et al. 2023

Adv. Nat. Sci: Nanosci. Nanotechnol.

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“…For UV–vis detection, semiconductors such as CdS, ZnO, and TiO 2 are commonly doped with rare-earth ions to enhance the photodetection performance. − Shkir et al prepared Eu-doped CdS thin films by the spray pyrolysis method and investigated their optical and photoelectric properties . By varying the Eu doping concentration from 1 to 5 wt %, the direct bandgap could be tuned from 2.43 to 2.48 eV, which is attributed to electronic interactions between the 4f electrons of Eu and the s and p electrons of CdS.…”

Section: Technological Applicationsmentioning

confidence: 99%

Rare-Earth Doping in Nanostructured Inorganic Materials

et al. 2022

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Impurity doping is a promising method to impart new properties to various materials. Due to their unique optical, magnetic, and electrical properties, rare-earth ions have been extensively explored as active dopants in inorganic crystal lattices since the 18th century. Rare-earth doping can alter the crystallographic phase, morphology, and size, leading to tunable optical responses of doped nanomaterials. Moreover, rare-earth doping can control the ultimate electronic and catalytic performance of doped nanomaterials in a tunable and scalable manner, enabling significant improvements in energy harvesting and conversion. A better understanding of the critical role of rare-earth doping is a prerequisite for the development of an extensive repertoire of functional nanomaterials for practical applications. In this review, we highlight recent advances in rare-earth doping in inorganic nanomaterials and the associated applications in many fields. This review covers the key criteria for rare-earth doping, including basic electronic structures, lattice environments, and doping strategies, as well as fundamental design principles that enhance the electrical, optical, catalytic, and magnetic properties of the material. We also discuss future research directions and challenges in controlling rare-earth doping for new applications.

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“…Higher Er doping content improves the performance of the device as a diode owing to the removal of O‐related defects. [ 127 ] The Schottky barrier height of N‐doped single TiO 2 NWs is regulated by the implantation concentration, resulting in more effective contact between the NW and the Cr/Au electrode. [ 52b ] The height of the Schottky barrier can be reduced by introducing surface defects under UV light illumination.…”

Section: Microstructural Defects In Nanostructured Tio2mentioning

confidence: 99%

Application of Nanostructured TiO₂ in UV Photodetectors: A Review

et al. 2022

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moderate UV light is beneficial for human health, however, excessive UV radiation can cause various human diseases as well as strong destruction to the output of crops and the lifespan of buildings. [1b,3a,4] Therefore, an efficient detection of UV radiation is of significant importance in widespread applications, for example, chemical, environmental, and biological analysis or warning, astronomical investigation, and optical communication. [1c,5] For forewarning UV radiation with high-efficiency, a wide variety of UV PDs such as photomultiplier and silicon diode, have been extensively investigated and applied in the past decades. Nevertheless, there are intrinsic imperfections for the present commercial PDs, such as fragile, large volume, and excessive cost, which are obstacles when meeting the growing requirement of miniaturized and reliable UV detection devices for portable or shipped applications. In recent years, the development of semiconductor-based PDs that work according to the photoelectric effect has received great research interest. [1b,3a,6] In this scenario, a delicate selection of suitable materials with efficient morphological, microstructural, and photoelectrical characteristics plays a key role in the construction of PDs with high-performance. Generally, the PDs work following several different physical mechanisms, that is, surface plasma-wave-assisted effect, photoconductive effect, photothermoelectric effect, and photovoltaic effect, which have been systematically demonstrated in the previous report. [7] More recently, a new generation of wide-bandgap semiconductors including the classification of nitrides (GaN, AlN, BN, etc.), carbides (SiC, diamond, etc.), sulfides (ZnS, etc.), oxides (ZnO, Ga 2 O 3 , TiO 2 , etc.), halide perovskites (e.g., CH 3 NH 3 PbCl 3 ), [8] and their combinations, is emerged as the most attractive material candidates for constructing high-performance UV PDs, owing to their unique advantages, for instance low permittivity, high breakdown electric-fields, good thermal conductivity, high electron saturation rates, excellent radiation resistance, and their appropriate spectral range for UV response. [1d] In addition, the photoelectric conversion processes of the semiconductorbased PDs can be generally described by the behaviors of charge carriers, such as their generation, separation, transportation, and extraction. [9] Therefore, any factor that influences the photon-generated carrier behaviors should be the key parameter for further tuning their photodetecting performances. It As a wide-bandgap semiconductor material, titanium dioxide (TiO 2 ), which possesses three crystal polymorphs (i.e., rutile, anatase, and brookite), has gained tremendous attention as a cutting-edge material for application in the environment and energy fields. Based on the strong attractiveness from its advantages such as high stability, excellent photoelectric properties, and lowcost fabrication, the construction of high-performance photodetectors (PDs) based on TiO 2 nanostructures is ...

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Investigation of optical and electrical properties of erbium-doped TiO2 thin films for photodetector applications

Cited by 21 publications

References 47 publications

Studying the structural and optical properties of Er³⁺ doped TiO₂ powders synthesized by the sol-gel process

Studying the structural and optical properties of Er³⁺ doped TiO₂ powders synthesized by the sol-gel process

Rare-Earth Doping in Nanostructured Inorganic Materials

Application of Nanostructured TiO₂ in UV Photodetectors: A Review

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Investigation of optical and electrical properties of erbium-doped TiO2 thin films for photodetector applications

Cited by 21 publications

References 47 publications

Studying the structural and optical properties of Er3+ doped TiO2 powders synthesized by the sol-gel process

Studying the structural and optical properties of Er3+ doped TiO2 powders synthesized by the sol-gel process

Rare-Earth Doping in Nanostructured Inorganic Materials

Application of Nanostructured TiO2 in UV Photodetectors: A Review

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Studying the structural and optical properties of Er³⁺ doped TiO₂ powders synthesized by the sol-gel process

Studying the structural and optical properties of Er³⁺ doped TiO₂ powders synthesized by the sol-gel process

Application of Nanostructured TiO₂ in UV Photodetectors: A Review