Electronic structure of cobalt doped CdSe quantum dots using soft X-ray spectroscopy

Wright, Joshua; Su, Dong; Buuren, T. van; Meulenberg, Robert W.

doi:10.1039/c4tc01324g

Cited by 5 publications

(2 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Gamelin's group has shown via single particle spectroscopy, however, that the Cu related PL feature is distinctly related to the Cu(I) dopant, while any appearance of BE PL is due to undoped QDs in the mixture. 15 This highlights two important points: (1) single particle methods must be employed in doped QD systems to probe any dot-to-dot differences (we observed similar results on Co doped CdSe QDs 20 ) and ( 2) PL cannot be used as a singular technique to probe dopant oxidation states.…”

Section: Copper Oxidation Statementioning

confidence: 60%

Implications of orbital hybridization on the electronic properties of doped quantum dots: the case of Cu:CdSe

et al. 2016

Self Cite

View full text Add to dashboard Cite

This paper investigates how chemical dopants affect the electronic properties of CdSe quantum dots (QDs) and why a model that incorporates the concepts of orbital hybridization must be used to understand these properties. Extended X-ray absorption fine structure spectroscopy measurements show that copper dopants in CdSe QDs occur primarily through a statistical doping mechanism. Ultraviolet photoemission spectroscopy (UPS) experiments provide a detailed insight on the valence band (VB) structure of doped and undoped QDs. Using UPS measurements, we are able to observe photoemission from the Cu d-levels above VB maximum of the QDs which allows a complete picture of the energy band landscape of these materials. This information provides insights into many of the physical properties of doped QDs, including the highly debated near-infrared photoluminescence in Cu doped CdSe QDs. We show that all our results point to a common theme of orbital hybridization in Cu doped CdSe QDs which leads to optically and electronically active states below the conduction band minimum. Our model is supported from current-voltage measurements of doped and undoped materials, which exhibit Schottky to Ohmic behavior with Cu doping, suggestive of a tuning of the lowest energy states near the Fermi level.

show abstract

Section: Copper Oxidation Statementioning

confidence: 60%

Implications of orbital hybridization on the electronic properties of doped quantum dots: the case of Cu:CdSe

et al. 2016

Self Cite

View full text Add to dashboard Cite

show abstract

“…Since most spintronic devices can only be used at room temperature, it is important to prepare diluted magnetic semiconductors with room temperature ferromagnetism. [9][10][11][12][13][14][15][16][17][18][19][20] Diluted magnetic NCs, which can be seen as decreasing down the size of diluted magnetic semiconductors to the nanosize scale, can dramatically improve the performance of diluted magnetic semiconductors due to the connement of electrons in a small region. Nowadays, only a few diluted magnetic NCs can realize room temperature ferromagnetism.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of nontoxic Co:CuInS₂@ZnS nanocrystals with both fluorescence and room temperature ferromagnetism

2016

View full text Add to dashboard Cite

show abstract

Influence of doping of mercury atom(s) on optoelectronic properties of binary cadmium chalcogenides - A density functional theory based investigation with different exchange-correlation functionals and including spin-orbit coupling

Debbarma

Sarkar

Debnath

et al. 2018

Current Applied Physics

View full text Add to dashboard Cite

Electronic structure of cobalt doped CdSe quantum dots using soft X-ray spectroscopy

Cited by 5 publications

References 39 publications

Implications of orbital hybridization on the electronic properties of doped quantum dots: the case of Cu:CdSe

Implications of orbital hybridization on the electronic properties of doped quantum dots: the case of Cu:CdSe

Synthesis of nontoxic Co:CuInS₂@ZnS nanocrystals with both fluorescence and room temperature ferromagnetism

Influence of doping of mercury atom(s) on optoelectronic properties of binary cadmium chalcogenides - A density functional theory based investigation with different exchange-correlation functionals and including spin-orbit coupling

Contact Info

Product

Resources

About

Electronic structure of cobalt doped CdSe quantum dots using soft X-ray spectroscopy

Cited by 5 publications

References 39 publications

Implications of orbital hybridization on the electronic properties of doped quantum dots: the case of Cu:CdSe

Implications of orbital hybridization on the electronic properties of doped quantum dots: the case of Cu:CdSe

Synthesis of nontoxic Co:CuInS2@ZnS nanocrystals with both fluorescence and room temperature ferromagnetism

Influence of doping of mercury atom(s) on optoelectronic properties of binary cadmium chalcogenides - A density functional theory based investigation with different exchange-correlation functionals and including spin-orbit coupling

Contact Info

Product

Resources

About

Synthesis of nontoxic Co:CuInS₂@ZnS nanocrystals with both fluorescence and room temperature ferromagnetism