D.M. Hofmann

LMU Klinikum

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Compensation Models in Chlorine Doped CdTe Based on Positron Annihilation and Photoluminescence Spectroscopy

Acta Physica Polonica A (1995)

Wolfgang Stadler D.M. Hofmann Bertrand Meyer R. Krause‐Rehberg A. Polity

In this investigatioii positron annihilation, photoluminescence and electroii paramagnetic resonance techniques are employed to gain insight in the compensation of CdTe doped with the halogen Cl.We will demonstrate that the high resistivity of CdTe:Cl cannot be explained by the interaction between the shallow effective mass type donor Cl on Te site and the doping induced shallow acceptor complex, a Cd vacancy paired off with a nearest-neighbour Cl atom (A centre).From electroii paramagnetic resonance investigations we conclude that the mid gap trap, often detected by electrical methods in CdTe, is not the isolated Cd vacancy.

Positron annihilation spectroscopy

Cadmium telluride photovoltaics

Annihilation

10.12693/aphyspola.88.921

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Citations (10)

A Spin Resonance Study of The 2.9 eV Luminescence Centers in Natural and Synthetic Diamond

MRS Proceedings (1994)

D.M. Hofmann Wolfgang Stadler B. K. Meyer L. Pereira Liliana Santos

10.1557/proc-339-619

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Citations (1)

Optically detected spin resonance of conduction band electrons in InGaAs/InP quantum wells

Semiconductor Science and Technology (1996)

B. Kowalski P. Omling B. K. Meyer D.M. Hofmann V. Härle

Optically detected spin resonance was used to measure the effective g-value of electrons at the conduction band minimum in type-I quantum wells. The experiments showed that the spin resonance is induced by electric dipole transitions, and hence is not limited by the short carrier lifetime that renders magnetic dipole transitions impossible. The spin splittings obtained are strongly anisotropic and dependent on quantum well thickness. A calculation without adjustable parameters, using a three-band Kane model, agrees with the experimental data. The bulk effective g-value of used in this calculation was measured on a thick sample.

10.1088/0268-1242/11/10/011

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Citations (13)

The Residual Donor Binding Energy in AlGaN Epitaxial Layers

physica status solidi (a) (1998)

G. Steude D.M. Hofmann B. Meyer H. Amano I. Akasaki

10.1002/(sici)1521-396x(199802)165:2<r3::aid-pssa99993>3.3.co;2-8

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Citations (0)

The temperature dependence of the electron g-factor in CdTe

Journal of Crystal Growth (1998)

B. K. Meyer A. Hofstaetter U. Leib D.M. Hofmann

Cadmium telluride photovoltaics

Atmospheric temperature range

g factor

10.1016/s0022-0248(98)80234-0

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Citations (5)

ChemInform Abstract: Microscopic Identification of Anion Antisite Defects in Gallium Arsenide by Optically Detected Magnetic Resonance

Chemischer Informationsdienst (1986)

J.‐M. Spaeth D.M. Hofmann Bertrand Meyer

Identification

10.1002/chin.198615399

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Citations (0)

The conduction band spin splitting in type-I strained and unstrained (GaIn)As/InP quantum wells

Solid-State Electronics (1994)

P. Omling B. Kowalski Bertrand Meyer D.M. Hofmann Christian Wetzel

10.1016/0038-1101(94)90272-0

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Citations (6)

Cyclotron Resonance and Hot Electron Effects in II-VI Semiconductors

physica status solidi (b) (1997)

Bertrand Meyer D.M. Hofmann

Cyclotron resonance using microwave and far infrared radiation is used to study nonparabolicity of electron effective masses and spin splitting effects in high mobility CdTe, ZnTe and ZnSe. Mobilities close to 1×106 cm2/Vs are found but only for high magnetic fields when scattering events on the orbits given by the magnetic length are relevant. Nonparabolicity effects are not evident for ZnSe/ZnSSe quantum wells, mass enhancement arises from a penetration of the electron wave function into the barrier. The potential of optically detected cyclotron resonance at microwave frequencies allows to give insight in hot electron effects in ZnTe.

Cyclotron resonance

Electron cyclotron resonance

Ion cyclotron resonance

10.1002/1521-3951(199708)202:2<783::aid-pssb783>3.0.co;2-4

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Citations (8)

Identification of the chlorineAcenter in CdTe

Physical review. B, Condensed matter (1992)

D.M. Hofmann P. Omling H. G. Grimmeiss Bertrand Meyer K. W. Benz

The chlorine A center has been identified in CdTe using photoluminescence and optically detected magnetic-resonance techniques. The A center is found to be an acceptor with a binding energy ${\mathit{E}}_{\mathit{a}}$=120\ifmmode\pm\else\textpm\fi{}3 meV and consists of a Cd vacancy and a Cl donor on a nearest Te site. The defect has trigonal symmetry with ${\mathit{g}}_{\mathrm{?}}$=2.2 and ${\mathit{g}}_{\mathrm{\ensuremath{\perp}}}$=0.4, assuming an effective spin S=1/2. The interactions with the three Te neighbors are also resolved and the measured isotropic ligand hyperfine interaction amounts to (2.7\ifmmode\pm\else\textpm\fi{}0.4)\ifmmode\times\else\texttimes\fi{}${10}^{\mathrm{\ensuremath{-}}2}$ ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$.

Center (category theory)

Cadmium telluride photovoltaics

10.1103/physrevb.45.6247

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Citations (197)

Properties of the yellow luminescence in undoped GaN epitaxial layers

Physical review. B, Condensed matter (1995)

D.M. Hofmann D. Kovalev G. Steude B. K. Meyer A. Hoffmann

Photoluminescence, time-integrated, time-resolved, and photoluminescence excitation spectroscopy have been employed to study the 2.2 eV (``yellow'') emission in undoped GaN epitaxial layers. It is best described by a recombination model involving shallow donors and deep donors of probably intrinsic origin. Optically detected magnetic resonance reveals the participation of the shallow donor based on the analysis of the g value and Lorentzian line shape.

Photoluminescence excitation

Shallow donor

Line (geometry)

10.1103/physrevb.52.16702

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Citations (230)