Assessment of persistent-photoconductivity centers in MBE grown Al x Ga1-x as using capacitance spectroscopy measurements

Zhou, Bangdi; Gmelin, E.; Zheng, Xiao; Schulz, M.

doi:10.1007/bf00618698

Cited by 62 publications

(8 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The lattice relaxation model [50,58,59] is one of the most widely accepted descriptions for the PPC effects in semiconductor heterostructures. The model stipulates photoexcitation of carriers from defect-induced deep-level traps.…”

Section: Discussionmentioning

confidence: 99%

Enhanced persistent photoconductivity inδ-doped LaAlO3/SrTiO3heterostructures

2014

View full text Add to dashboard Cite

We report the effect of δ doping at the LaAlO 3 /SrTiO 3 interface with LaMnO 3 monolayers on the photoconducting (PC) state. The PC is realized by exposing the samples to broadband optical radiation of a quartz lamp and 325 and 441 nm lines of a He-Cd laser. Along with the significant modification in electrical transport which drives the pure LaAlO 3 /SrTiO 3 interface from metal-to-insulator with increasing LaMnO 3 sub-monolayer thickness, we also observe an enhancement in the photoresponse and relaxation time constant. A possible scenario for the PC based on defect clusters, random potential fluctuations, and large lattice relaxation models, along with the role of structural phase transition in SrTiO 3 , is discussed. For pure LaAlO 3 /SrTiO 3 , the photoconductivity appears to originate from interband transitions between Ti-derived 3d bands which are e g in character and O 2p-Ti t 2g hybridized bands. The band structure changes significantly when fractional layers of LaMnO 3 are introduced. Here the Mn e g bands (≈1.5 eV above the Fermi energy) within the photoconducting gap lead to a reduction in the photoexcitation energy and a gain in overall photoconductivity.

show abstract

Section: Discussionmentioning

confidence: 99%

Enhanced persistent photoconductivity inδ-doped LaAlO3/SrTiO3heterostructures

2014

View full text Add to dashboard Cite

show abstract

“…5 Zhou et al recently showed multilayered flower-like ZP aggregates composed of twodimensional nanosheets formed by self-assembly. 20 In this study, we obtained similar sheet-like morphologies of ZP in gelatin hydrogel by the slow diffusion of ions. Note that, the ionic strength of gelatin can be modulated via zinc ions, therefore, the number of hydrogen bonds and the coupling of zinc ions with the gelatin carboxylate anions can be changed due to pH changes in gel.…”

Section: à2mentioning

confidence: 62%

“…Similar results were observed in our former studies on calcium hydrogen phosphate, barium hydrogen phosphate, and strontium hydrogen phosphate composite samples produced in gelatin hydrogel. 11,12,20 The third region was started at 300°C with pyrolytic cleavage of the phosphate groups and the removal of excess water from the structure. We also found that differences in thermal degradation are negligible for all nanocomposite samples.…”

Section: à2mentioning

confidence: 99%

Biomineralization‐Inspired Green Synthesis of Zinc Phosphate‐Based Nanosheets in Gelatin Hydrogel

Gashti

Helali

Karimi

2016

Int J Applied Ceramic Tech

View full text Add to dashboard Cite

Diffusion of inorganic salts in gels is a simple, inexpensive, and versatile technique for the synthesis of inorganic/organic hybrid nanocomposite particles with various morphologies. This paper introduces a novel method for producing zinc phosphate (ZP) nanosheets using single diffusion of zinc ions in gelatin at ambient temperature. FTIR spectra showed the entrapment of gelatin in ZP sheets due to electrostatic interactions between charged groups of gelatin and diffused ions. This study demonstrated that hydrogels can be used for crystallization of ZP. Such a nanocomposite particle may open a new window for producing antimicrobial and materials for use in tissue engineering.

show abstract

“…The lattice relaxation model 49,57,58 is one of the most widely accepted description for the PPC effects in semiconductor heterostructures. The model stipulates photoexcitation of carriers from defect induced deep-level traps .…”

Section: Discussionmentioning

confidence: 99%

Enhanced persistent photoconductivity in $δ$-doped LaAlO$_{3}$/SrTiO$_{3}$ heterostructures

Rastogi,

Pulikkotil,

Budhani

2014

Preprint

View full text Add to dashboard Cite

We report the effect of δ-doping at LaAlO3/SrTiO3 interface with LaMnO3 monolayers on the photoconducting (PC) state. The PC is realized by exposing the samples to broad band optical radiation of a quartz lamp and 325 and 441 nm lines of a He-Cd laser. Along with the significant modification in electrical transport which drives the pure LaAlO3/SrTiO3 interface from metal-toinsulator with increasing LaMnO3 sub-monolayer thickness, we also observe an enhancement in the photo-response and relaxation time constant. Possible scenario for the PC based on defect-clusters, random potential fluctuations and large lattice relaxation models have been discussed. For pure LaAlO3/SrTiO3, the photoconductivity appears to originate from inter-band transitions between Ti-derived 3d bands which are eg in character and O 2p -Ti t2g hybridized bands. The band structure changes significantly when fractional layers of LaMnO3 are introduced. Here the Mn eg bands (≈ 1.5 eV above the Fermi energy) within the photo-conducting gap lead to a reduction in the photo-excitation energy and a gain in overall photoconductivity.

show abstract

Assessment of persistent-photoconductivity centers in MBE grown Al x Ga1-x as using capacitance spectroscopy measurements

Cited by 62 publications

References 3 publications

Enhanced persistent photoconductivity inδ-doped LaAlO3/SrTiO3heterostructures

Enhanced persistent photoconductivity inδ-doped LaAlO3/SrTiO3heterostructures

Biomineralization‐Inspired Green Synthesis of Zinc Phosphate‐Based Nanosheets in Gelatin Hydrogel

Enhanced persistent photoconductivity in $δ$-doped LaAlO$_{3}$/SrTiO$_{3}$ heterostructures

Contact Info

Product

Resources

About