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Featured researches published by Martin Hostalek.


Japanese Journal of Applied Physics | 1993

Metalorganic Molecular Beam Epitaxy of AlGaAs Using APAH

Frank König; Georg Mörsch; M. Kamp; Hans Lüth; Martin Hostalek; Ludwig Pohl

To take advantage of the benefits of gaseous precursors for the growth of AlGaAs, a reduction of the carbon and oxygen uptake from the sources is necessary. Therefore, new precursors have been developed recently to overcome these problems. An entirely new approach is the use of an intramolecular saturated precursor, where the coordinative saturation against oxygen is realised by means of a double ring structure. 1-(3-dimethylaminopropyl)-1-ala-cyclohexan (APAH) is a representative of this class of precursors. In metalorganic molecular beam epitaxy (MOMBE) the suitability of APAH for the growth of AlxGa1-xAs layers (0≤x≤1) was investigated in combination with TEGa and arsine. For the grown layers morphology and crystallinity are found to be excellent, whereas the background carrier concentrations are in the range of p=1017 to 1019 cm-3. SIMS measurements clearly identify carbon as the main acceptor. Other than carbon, nitrogen is also incorporated from APAH. Despite this, APAH is useful for particular heterostructure applications as demonstrated by quantum well structures with excellent interfaces. Therefore, in MOMBE of AlGaAs, APAH is a suitable Al precursor for applications where p-type doping of 1017 cm-3 or above is required or acceptable (e.g., in HBT).


Chemische Berichte | 1986

Synthese und Reaktivität von 2-Borolenen und von 3-Borolenen

Gerhard E. Herberich; Wilfried Boveleth; Bernd Heßner; Martin Hostalek; Dieter P. J. Köffer; Holger Ohst; Dietmar Söhnen


Angewandte Chemie | 1986

Ein 1,2-Diboratabenzol: Lithiumsalz und Übergangsmetallkomplexe†

Gerhard E. Herberich; Bernd Heßner; Martin Hostalek


Chemische Berichte | 1990

Intramolecularly stabilized organoaluminium, -gallium and -indium derivatives crystal structures of {o-[(dimethylamino)methyl]phenyl}dimethylgallium and {o-[(diethylamino)methyl]phenyl}dimethylindium

Uwe Hartmann; Wilfried Wassermann; Andreas Dietrich; Frank H. Görlitz; Ludwig Pohl; Martin Hostalek


Chemische Berichte | 1991

Derivate des Borols, XVI Bis(borol)nickel‐Komplexe2)

Gerhard E. Herberich; Ulli Englert; Martin Hostalek; Ralf Laven


Angewandte Chemie | 1990

Borole Dianions: Metalation of 1‐(Dialkylamino)‐2,5‐dihydro‐lH‐boroles and the Structure of Li2 (C4 H4 BNEt2)·TMEDA

Gerhard E. Herberich; Martin Hostalek; Ralf Laven; Roland Boese


Chemische Berichte | 1991

Intramolecular, Metallacyclic Organoaluminium, ‐gallium and ‐indium Addition Compounds Crystal Structure of 1‐Galla‐5‐azabicyclo[3.3.3]undecane

Herbert Schuman; Uwe Hartman; Wilfried Wassermann; Oliver Just; Andreas Dietrich; Ludwig Pohl; Martin Hostalek; Matthias Lokai


Archive | 2000

Method for producing high-purity sulphuric acid

Martin Hostalek; Werner Büttner; Rolf Hafner; Chih-Peng Lu; Ching-Jung Kan; Ekkehart Seitz; Ernst Friedel


Angewandte Chemie | 1990

Borol‐Dianionen: Metallierung von 1‐(Dialkylamino)‐2,5‐dihydro‐1H‐borolen und die Struktur von Li2(C4H4BNEt2) · TMEDA

Gerhard E. Herberich; Martin Hostalek; Ralf Laven; Roland Boese


Archive | 1998

Buffer solutions for suspensions used in chemical-mechanical polishing

Claus Dusemund; Rudolf Rhein; Manuela Schweikert; Martin Hostalek

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