Intermdiately Bound Excitons in Wurtzit Type Semiconducturs Doped with Transition Metal Impurities

Dahan, P.; Fleurov, Vladimir B.; Kikoin, K.

doi:10.4028/www.scientific.net/msf.196-201.755

Cited by 7 publications

(12 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The hybridization of the 2 T 2 level is expected to be larger than that of the 2 E state, due to the wurtzite symmetry of this crystal, in which a hybridization of the 2 T 2 with the conduction band states is allowed. 16,17…”

Section: Comparison Of the Results For The Intracenter Transition mentioning

confidence: 99%

“…The ninth electron energy of a neutral Cu 2ϩ (d 9 ) impurity in a 2 T 2 or 2 E state corresponds to lines lying close to the conduction band, and therefore the corresponding wave functions are hybridized with the conduction-band s states. The hybridization between the d and s states is allowed in hexagonal crystals 16,17 when the corresponding matrix element V ⌫c (k) is not zero at k→0.…”

Section: A Intracenter Transitionsmentioning

confidence: 99%

“…Therefore, the ninth electron wave functions can be approximately written as a bonding combination of the atomic d-function d⌫ and the Bloch tail s⌫ , 16,17 i⌫ Ӎ 1…”

Section: A Intracenter Transitionsmentioning

confidence: 99%

See 2 more Smart Citations

Isotope shift in semiconductors with transition-metal impurities: Experiment and theory applied toZnO:Cu

et al. 1998

Self Cite

View full text Add to dashboard Cite

Isotope shifts for various lines associated with excitations of transition-metal impurities in semiconductors are considered. Special attention is paid to ZnO:Cu, for which experimental results are presented. Isotope shifts are measured for the so-called photoluminescence ␣ and ␤ zero-phonon lines associated with excitations of bound excitons, and of the zero-phonon line associated with the intracenter Cu 2ϩ (2 T 2 Ϫ 2 E) transition. These shifts appear to be negative and nearly equal. A theoretical model explaining these results is proposed, which incorporates the mode softening mechanism and the covalent swelling of the impurity d electron wave functions. It is shown that, contrary to transitions in simple neutral impurities, this mechanism works both for the excited and ground states of all processes in transition-metal impurities considered here. Using reasonable values of the parameters of the system, we are able to explain both the sign and value of the isotope shifts. ͓S0163-1829͑98͒04115-0͔

show abstract

Section: Comparison Of the Results For The Intracenter Transition mentioning

confidence: 99%

Section: A Intracenter Transitionsmentioning

confidence: 99%

See 1 more Smart Citation

Isotope shift in semiconductors with transition-metal impurities: Experiment and theory applied toZnO:Cu

et al. 1998

Self Cite

View full text Add to dashboard Cite

show abstract

“…Then the leading contribution to the mass operator M(E i 1 ) comes from the conduction band, hybridization with which is allowed in hexagonal crystals. Therefore, similarly to in the case of CdS:Ni discussed in references [11,12], the electron wave function may be represented as a bonding combination ψ (10) i 4…”

Section: Theorymentioning

confidence: 99%

“…Magneto-optic measurements show that these ZPLs are Kramers doublets with different and anisotropic g-factors. It was shown [11,12] recently for Ni in CdS that the approach based on deeply bound excitons may be not adequate and has to be modified for the wurzite-type crystals in order to explain the experimental data. This has been done by means of the concept of intermediately bound excitons.…”

Section: Introductionmentioning

confidence: 99%

Properties of the intermediately bound and -excitons in ZnO:Cu

Dahan

Fleurov

Thurian

et al. 1998

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

A microscopical model is proposed, describing the origin and properties of three closely spaced zero-phonon lines observed in the green Cu band in ZnO:Cu crystals labelled and . These excitations are known to be formed by a charge-transfer reaction with hole bound states. These lines are shown to originate from an intermediately bound exciton of acceptor type, . This sort of exciton, in which both carriers are captured at intermediate-radius orbitals, results from the wurzite-type symmetry of the ZnO:Cu system. The electronic structure obtained for these three intermediately bound excitons enables us to explain their magneto-optic behaviour and to calculate their g-values. Additionally, we determined the quantum efficiency of both intracentre and exciton transitions by using time-resolved and calorimetric absorption spectroscopy. While no luminescence is observed in ZnS, the exciton states in ZnO are purely radiative only to the ground state, . The picture of an intermediately bound exciton explains the recombination channels and also makes clear the difference between copper states in the ZnS and ZnO systems.

show abstract

Zinc sulfide (ZnS) property: impurity (defect) bound excitons

Landolt-Börnstein - Group III Condensed Matter

View full text Add to dashboard Cite

Intermdiately Bound Excitons in Wurtzit Type Semiconducturs Doped with Transition Metal Impurities

Cited by 7 publications

References 0 publications

Isotope shift in semiconductors with transition-metal impurities: Experiment and theory applied toZnO:Cu

Isotope shift in semiconductors with transition-metal impurities: Experiment and theory applied toZnO:Cu

Properties of the intermediately bound and -excitons in ZnO:Cu

Zinc sulfide (ZnS) property: impurity (defect) bound excitons

Contact Info

Product

Resources

About