Investigations of growth defects in solution-grown GaxIn1−xP with a SEM operating in the cathodoluminescence mode

Voigt, G.; Raidt, H.; Peibst, H.; Menniger, H.; Hildisch, L.

doi:10.1002/pssa.2210360118

Cited by 16 publications

(2 citation statements)

References 10 publications

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“…The Inl-,Ga,P (z 2 0.77) samples were always polycrystals grown from a non-stoichiometric melt [8]. The composition was determined by microprobe analysis.…”

Section: Experimental Methodsmentioning

confidence: 99%

Magnetic circular dichroism of indirect excitonic transitions in GaP and In₁‐_xGa_xP

Donecker¹,

Kluge²

1976

Physica Status Solidi (b)

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Measurements of the magnetic circular dichroism (MCD) of the indirect absorption edge of intrinsic GaP and Inl-,Ga,P (z 2 0.77) a t temperatures from 2.5 to 300 K and at magnetic fields up to 52 kOe are reported. The fine structure of the indirect absorption edge is well resolved. The MCD peaks corresponding to LA and TA assisted indirect transitions have the same shape as the corresponding peaks in the wavelength modulated spectra, b u t the latter have different signs. That means that the thresholds of the indirect absorption edge are rigidly shifted by the magnetic field and the direction of the shift is connected with the type of the phonons. Additionally a n MCD peak appears in mixed crystals which corresponds to the no-phonon transition. It has the same sign as the LA-MCD peak. An attempt is made to interprete the experimental results by group theory within an exciton model. Further theoretical effort is necessary for a satisfactory explanation.Es wird uber Messungen des magnetischen Zirkulardichroismus (MCD) a n der indirekten Absorptionskante von undotiertem GaP und In1 _,Ga,P (z 2 0,77) bei Temperatwen zwischen 2,5 und 300 K und bei Magnetfeldern bis zu 52 kOe berichtet. Die Feiiistruktur der indirekten Absorptionskante ist gut aufgelost. Die MCD-Peaks, die LA-bzw. TAassistierten indirekten fibergiingen zuzuordnen sind, stimmen in der Form gut mit denen der entsprechenden wellenliingenmodulierten Spektren iiberein, haben jedoch im Unt,erschied zu letzteren unterschiedliche Vorzeichen. Das bedeutet, daO die Stufen in der indirekten Absorptionskante durch das magnetische Feld starr verschoben werden, daO die Richtung der Verschiebung jedoch mit der Phononenart zusammenhangt. I n Mischkristallen tritt zusiitzlich ein MCD-Peak auf, der dem No-Phonon-Ubergang entspricht und das Vorzeichen des LA-MCD-Peaks hat. Es wird ein Versuch unternommen, die experimentellen Ergebnisse mit gruppentheoretischen Mitteln innerhalb eines Exzitonenmodells zu erkliiren. Weitere theoretische Untersuchungen sind fur eine befriedigende Erkliirung notwendig.

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“…The Inl-,Ga,P (z 2 0.77) samples were always polycrystals grown from a non-stoichiometric melt [8]. The composition was determined by microprobe analysis.…”

Section: Experimental Methodsmentioning

confidence: 99%

Magnetic circular dichroism of indirect excitonic transitions in GaP and In₁‐_xGa_xP

Donecker¹,

Kluge²

1976

Physica Status Solidi (b)

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“…Inl-,Ga,P mixed crystals as well as the pure end-member crystals I n P and GaP were grown from the non-stoichiometric melt by a modified Bridgman method described by Voigt et al, [19]. Slices with thicknesses varying from 0.1 to 0.5 mm (depending on composition x) were cut from the boules and mechanically polished.…”

Section: Samples and Apparatusmentioning

confidence: 99%

Two‐phonon infrared absorption in In_1−xGa_xP mixed crystals

Ulrici¹,

Jähne²

1978

Physica Status Solidi (b)

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The transmission spectra of Inl-,Ga,P mixed crystals (0 5 x 5 1) are measured between 20 and 550 K in the spectral range from 400 to 800 cm-l in which the optical absorption is due to two-phonon summation processes. The spectra of the end-member crystals and that of the mixed crystals consist of two main band groups in which up to seventeen structures are observed and pursued over the entire composition range. As an effect of disorder a broadening of the structures and an increase of absorption in the structureless region of the spectra are observed. The structures in the spectra are assigned to particulart two-phonon combinations or overtones of the various phonon branches -exploiting existing neutron and Raman data of the end-member crystals as well as the measured temperature dependence of the infrared spectra of mixed crystals. The compositional dependence of the LO, LA, TO, TA phonons at the X and L point and the LO, TO phonons a t the I? point are derived. It turns out that all phonon modes assigned display one-mode behaviour.Die Transmissionsspektren des Mischkristallsystems In1 -,Ga,P (0 5 z 5 1) werden zwischen 20 und 550 K im Spektralbereich von 400 bis 800 cm-1 gemessen, in dem die optische Absorption durch Zwei-Phonon-Summenprozesse verursacht wird. Die Spektren bestehen aus zwei dominierenden Bandengruppen, in denen bis zu siebzehn Strukturen beobachtet und uber den gesamten Zusammensetzungsbereich verfolgt werden konnen. Als Effekt der Unordnung findet man eine Verbreiterung der Strukturen und ein Anwachsen der Absorption in dem strukturlosen Bereich des Spektrums. Die Strukturen in den Spektren werden -unter Verwendung bekannter Neutronen-und Raman-Daten der Endkomponenten sowie der gemessenen Temperaturabhkngigkeit der Infrarotspektren der Mischkristalle -bestimmten Kombinationen oder Obertanen zweier,Phononen der verschiedenen Schwingungszweige zugeordnet. Daraus wird die Abhiingigkeit der LO-, LA-, TO-, TA-Phononfrequenzen an den Punkten X und L und der LO-und TO-Phononfrequenzen am Punkt I' von der Zusammensetzung abgeleitet. Alle diese Phononmoden zeigen Ein-ModenVerhalten.

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Diffuse X-Ray scattering and compositional disorder in GaxIn1–xP

Brühl

Hildisch²,

Morwinski³

et al. 1977

Phys. Stat. Sol. (a)

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The cation distribution is investigated in polycrystalline Ga,,Jn-,l' wit,h r 7 0.5 and 0.8 by means of diffuse X-ray scattering. For the evaluation of t,he measurements a fitting proccdure is applied. The r e s u h show a strong tendency towards segregation in the case of Gao.5Ino.sP providing evidence for an "atomic size" effect; the short-range order paramcter for the first co-ordination shell is found to be a, i-0.13. A discussion of t,he results is prescnt.ed. hlit Hilfe der diffusen Kontgenstreuung wird die Kationcnverteilung in polykristallinern Ga,Inl-,P a.n Probcn mit. x = 0,s und 0,s untersucht. Die Bnalysc dcs diffusen Streuuntergrundes wird mit Hilfe eines Aripassungsvcrfakrens durchgefiihrt. In1 Fall dcs Gao,sIno,jP wird cine ausgepragtc Tendenz zur Entmiscliung sowie ein .,atomic size"-Effekt gefunden; der Warrensche Kahordnungsparameter fiir die erste Koortlinationsschale wird zii a, -+0,13 bestimnit. Die Ergebnisse werden diskntiert..

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Investigations of growth defects in solution-grown GaxIn1−xP with a SEM operating in the cathodoluminescence mode

Cited by 16 publications

References 10 publications

Magnetic circular dichroism of indirect excitonic transitions in GaP and In₁‐_xGa_xP

Magnetic circular dichroism of indirect excitonic transitions in GaP and In₁‐_xGa_xP

Two‐phonon infrared absorption in In_1−xGa_xP mixed crystals

Diffuse X-Ray scattering and compositional disorder in GaxIn1–xP

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Investigations of growth defects in solution-grown GaxIn1−xP with a SEM operating in the cathodoluminescence mode

Cited by 16 publications

References 10 publications

Magnetic circular dichroism of indirect excitonic transitions in GaP and In1‐xGaxP

Magnetic circular dichroism of indirect excitonic transitions in GaP and In1‐xGaxP

Two‐phonon infrared absorption in In1−xGaxP mixed crystals

Diffuse X-Ray scattering and compositional disorder in GaxIn1–xP

Contact Info

Product

Resources

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Magnetic circular dichroism of indirect excitonic transitions in GaP and In₁‐_xGa_xP

Magnetic circular dichroism of indirect excitonic transitions in GaP and In₁‐_xGa_xP

Two‐phonon infrared absorption in In_1−xGa_xP mixed crystals