Spectral Identification of Impurities and Native Defects in ZnO

Meyer, B. K.; Hofmann, Detlev M.; Stehr, Jan Eric; Hoffmann, A.

doi:10.1002/9781119991038.ch6

Cited by 2 publications

(3 citation statements)

References 127 publications

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“…Figure 5(c) indicates that heated albumen-covered ZnO NRs increase NBE emission intensity while decreasing DL emission intensity. A high NBE to DL emission ratio indicates that the semiconductor material has a high degree of crystallinity and indicates that there are fewer deep-level defects in the semiconductor material [55,56]. Also, it confirms that the majority of the photons emitted are from the near band-edge of the semiconductor material.…”

Section: Optical Properties Of the Zno Nrsmentioning

confidence: 84%

The effects of nontoxic bio-based substances (egg white) on the performance and passivation of ZnO nanorods arrays-based light emitting devices

Chuang,

Feria,

et al. 2024

Nanotechnology

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An innovative approach is proposed to passivate the existing defects from metal oxide semiconductors by functionalizing nontoxic bio-based substances. As a demonstration, we synthesized zinc oxide nanorods (ZnO NRs) using a hydrothermal method and incorporated chicken egg white (albumen) as a passivator to the defects. XRD analysis of ZnO NRs shows enhanced quality and crystallinity features after incorporating albumen. XPS measurements were performed not only to introduce the chemical bonding between the albumen and the bare ZnO NRs but also specifically provide evidence of successful capping and defect passivation to the surface layer of ZnO NRs. It was observed that when the albumen was annealed, it formed sulfhydryl groups and disulfide bonds (which created disulfide bridges) from the chemical reaction in irreversible thermal denaturation. Steady-state photoluminescence of ZnO NRs showed two emission bands, i.e., near band-edge emission (NBE) and deep-level emission (DL). The NBE is significantly improved as compared to DL emission after capping and annealing the albumen, while the quenching of DL emission confirmed the reduced defects arising from the surface of ZnO NRs. The advantages and enhanced characteristics of the albumen-capped ZnO NRs led to fabricating a stable and highly efficient light-emitting device. This work opens the great potential of utilizing nontoxic and low-cost biomaterials in passivating the defects of metal oxide nanomaterials for the development of bio-inspired and stable optoelectronic devices.

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Section: Optical Properties Of the Zno Nrsmentioning

confidence: 84%

The effects of nontoxic bio-based substances (egg white) on the performance and passivation of ZnO nanorods arrays-based light emitting devices

Chuang,

Feria,

et al. 2024

Nanotechnology

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“…The V O centers, are thermodynamically unstable even if they act as deep donors. They also require high temperatures or UV radiation to be activated according to Meyer et al as well as Janotti and Van de Walle . Thus, we may assign the native paramagnetic centers in sample ZnO:Mg to Zn i species with Landé g‐factor = 1.960.…”

Section: Resultsmentioning

confidence: 99%

“…They also require high temperatures or UV radiation to be activated according to Meyer et al as well as Janotti and Van de Walle. 47,48 Thus, we may assign the native paramagnetic centers in sample ZnO:Mg to Zn i species with Landé g-factor = 1.960. The increase in the EPR signal intensity compared to pure ZnO can be explained by the incorporation of Mg in ZnO lattice.…”

Section: F I G U R E 8 a Electron Paramagneticmentioning

confidence: 99%

Co‐doping effects of (Al, Ti, Mg) on the microstructure and electrical behavior of ZnO‐based ceramics

Sun

Tian

et al. 2020

J Am Ceram Soc

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Co‐doped ZnO‐based ceramics using Al, Ti, and Mg ions in different ratios were synthesized with the objective to investigate the doping effects on the crystalline features, microstructure and the electrical behavior. For Al and Ti doping, a coexistence of crystalline phases was shown with a major wurtzite ZnO structure and secondary spinel phases (ZnAl2O4, Zn2TiO4, or ZnaTibAlcOd), while Mg doping did not alter significantly the structural features of the wurtzite ZnO phase. The electrical behavior induced by Al, Ti, and Mg co‐doping in different ratios was investigated using Raman, electron paramagnetic resonance (EPR) and 27Al and 67Zn solid‐state nuclear magnetic resonance (NMR). Al doping induces a high electrical conductivity compared to other doping elements. In particular, shallow donors from Zni‐AlZn defect structures are inferred from the characteristic NMR signal at about 185 ppm; that is, quite far from the usual oxygen coordinated Al. The Knight shift effect emanating from a highly conducting Al‐doped ZnO ceramics was considered as the origin of this observation. Oppositely, as Ti doping leads to the formation of secondary spinel phases, EPR analysis shows a high concentration of Ti3+ ions which limit the electrical conductivity. The correlation between the structural features at the local order, the involved defects and the electrical behavior as function of the doping process are discussed.

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Spectral Identification of Impurities and Native Defects in ZnO

Cited by 2 publications

References 127 publications

The effects of nontoxic bio-based substances (egg white) on the performance and passivation of ZnO nanorods arrays-based light emitting devices

The effects of nontoxic bio-based substances (egg white) on the performance and passivation of ZnO nanorods arrays-based light emitting devices

Co‐doping effects of (Al, Ti, Mg) on the microstructure and electrical behavior of ZnO‐based ceramics

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