The role of cobalt doping in tuning the band gap, surface morphology and third-order optical nonlinearities of ZnO nanostructures for NLO device applications

Bairy, Raghavendra; Patil, P. S.; Maidur, Shivaraj R.; Vijeth, H.; Murari, M.S.; Bhat, K. Udaya

doi:10.1039/c9ra03006a

Cited by 66 publications

(22 citation statements)

References 52 publications

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“…The (002) reflections from TM-doped NRs were shifted slightly toward higher angles than that of the undoped ones, and this result was in good agreement with our recent Cu doping experimental observation [ 31 ], which validates the potential substitution of Zn 2+ by either Ni 2+ or Co 2+ in the host crystal of ZnO. However, a small amount of shift in (002) reflection can be associated with the insignificant mismatch in atomic radii of Ni (0.69 Å) or Co (0.72 Å) with that of Zn (0.74 Å) [ 32 , 33 ].…”

Section: Resultssupporting

confidence: 90%

Ultraviolet Photodetection Based on High-Performance Co-Plus-Ni Doped ZnO Nanorods Grown by Hydrothermal Method on Transparent Plastic Substrate

Ajmal¹,

Khan²,

Nam³

et al. 2020

Nanomaterials

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A growth scheme at a low processing temperature for high crystalline-quality of ZnO nanostructures can be a prime stepping stone for the future of various optoelectronic devices manufactured on transparent plastic substrates. In this study, ZnO nanorods (NRs) grown by the hydrothermal method at 150 °C through doping of transition metals (TMs), such as Co, Ni, or Co-plus-Ni, on polyethylene terephthalate substrates were investigated by various surface analysis methods. The TM dopants in ZnO NRs suppressed the density of various native defect-states as revealed by our photoluminescence and X-ray photoelectron spectroscopy analysis. Further investigation also showed the doping into ZnO NRs brought about a clear improvement in carrier mobility from 0.81 to 3.95 cm2/V-s as well as significant recovery in stoichiometric contents of oxygen. Ultra-violet photodetectors fabricated with Co-plus-Ni codoped NRs grown on an interdigitated electrode structure exhibited a high spectral response of ~137 A/W, on/off current ratio of ~135, and an improvement in transient response speed with rise-up and fall-down times of ~2.2 and ~3.1 s, respectively.

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Section: Resultssupporting

confidence: 90%

Ultraviolet Photodetection Based on High-Performance Co-Plus-Ni Doped ZnO Nanorods Grown by Hydrothermal Method on Transparent Plastic Substrate

Ajmal¹,

Khan²,

Nam³

et al. 2020

Nanomaterials

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“…Notably, our present investigated GCCO nanomaterials show a slightly higher optical bandgap compared to previously investigated GFCO nanoparticles, which is due to the higher electron concentration in the Co atom compared to the Fe atom associated with the higher number of electrons in Co than Fe, that is known as Burstein–Moss effect. 74,75…”

Section: Resultsmentioning

confidence: 99%

Structural, magnetic and optical properties of disordered double perovskite Gd₂CoCrO₆ nanoparticles

2023

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“…Te charge distribution changes as a result of the strong electric felds, resulting in a net dipole moment. Te NLO phenomenon is important in a variety of devices, including electro-optic modulators and frequency converters [24][25][26][27][28][29][30][31][32][33][34][35]. Te induced dipole moment per unit volume, also known as electrical polarisation (P), plays an important role in the NLO phenomenon.…”

Section: Tird Order Nonlinear Optical Studiesmentioning

confidence: 99%

“…Te absorption ratio (β) improves with optical intensity in NLA, and the enhancement of (β) occurs in RSA. Tese phenomena appear optically as reduced (SA) or enhanced (RS) absorption [28].…”

Section: Nonlinear Optical Absorptionmentioning

confidence: 99%

Role of Cobalt Doping on the Physical Properties of CdO Nanocrystalline Thin Films for Optoelectronic Applications

Bairy¹,

Somayaji²,

Marakala³

et al. 2022

Advances in Materials Science and Engineering

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In the current work, the authors aim to present an insight on the role of cobalt (Co) doping for the structural, morphological, and linear and nonlinear optical (NLO) properties of CdO thin films. The films were prepared using the spray pyrolysis (SP) technique, and the weight % of Co (x) was varied from 0–10. The structural properties of the films were confirmed by the powder X-ray diffraction (P-XRD) studies and are polycrystalline with a cubic structure and a lattice parameter of 0.4658 nm. As Co content in CdO films increases, cluster grain size and porosity decrease significantly, as seen in surface topographic and nanostructural analysis. Through the Burstein–Moss shift, the optical band gap “Eg” in Co: CdO film decreases from 2.52 to 2.05 eV with the increase in Co-doping. To study the NLO parameters, open aperture (OA) and closed aperture (CA) Z-scan measurements were performed using the diode-pumped solid-state continuous wave laser excitation (532 nm), and with the increased Co-content, the NLO parameters—nonlinear absorption coefficient (β∼10−3 cm/W), nonlinear refractive index n 2 ∼ 10−8 cm2/W), and the 3rd-order NLO susceptibility χ 3 ∼ 10−7 to 10−6 e.s.u.) values were determined and found to be enhanced. The maximum NLO parameters achieved in the present study with increasing Co concentration on CdO nanostructures prepared by the SP method are found to be the highest among the reported values and suggest that processed films are a capable material for optoelectronic sensor applications.

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The role of cobalt doping in tuning the band gap, surface morphology and third-order optical nonlinearities of ZnO nanostructures for NLO device applications

Abstract: The work presented here reported the effect of doping cobalt (Co) in ZnO thin films.

Cited by 66 publications

References 52 publications

Ultraviolet Photodetection Based on High-Performance Co-Plus-Ni Doped ZnO Nanorods Grown by Hydrothermal Method on Transparent Plastic Substrate

Ultraviolet Photodetection Based on High-Performance Co-Plus-Ni Doped ZnO Nanorods Grown by Hydrothermal Method on Transparent Plastic Substrate

Structural, magnetic and optical properties of disordered double perovskite Gd₂CoCrO₆ nanoparticles

Role of Cobalt Doping on the Physical Properties of CdO Nanocrystalline Thin Films for Optoelectronic Applications

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The role of cobalt doping in tuning the band gap, surface morphology and third-order optical nonlinearities of ZnO nanostructures for NLO device applications

Abstract: The work presented here reported the effect of doping cobalt (Co) in ZnO thin films.

Cited by 66 publications

References 52 publications

Ultraviolet Photodetection Based on High-Performance Co-Plus-Ni Doped ZnO Nanorods Grown by Hydrothermal Method on Transparent Plastic Substrate

Ultraviolet Photodetection Based on High-Performance Co-Plus-Ni Doped ZnO Nanorods Grown by Hydrothermal Method on Transparent Plastic Substrate

Structural, magnetic and optical properties of disordered double perovskite Gd2CoCrO6 nanoparticles

Role of Cobalt Doping on the Physical Properties of CdO Nanocrystalline Thin Films for Optoelectronic Applications

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Structural, magnetic and optical properties of disordered double perovskite Gd₂CoCrO₆ nanoparticles