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Humboldt-Universität zu Berlin - Mathematisch-Naturwissen­schaft­liche Fakultät - Novel Materials

Novel Semiconductor Materials

A range of novel semiductors materials are currently investigated, such III-sesquioxides or kesterides. Gallium oxide (Ga2O3), for example, is one of the few conducting transparent oxides (the others being zinc and indium). Most transparent materials are insulating rather than conducting. Therefore Ga2O3 has the potential, for example, of making much thinner displays than those currently manufactured. Ga2O3 is very important for measurements of thermal conductivity, something that is important to measure because heat is very relevant to electrical applications – they generally produce more heat than can be taken away. It is important to determine the thermal conductivity for different temperatures of the environment because physical properties change for different temperatures – this relationship needs to be known for further potential applications, especially regarding their durability and heat transport.


Selected Publications



Charge Carrier density, mobility and Seebeck coefficient of melt-grown bulk ZnGa2O4 single crystals
J. Boy, M. Handwerg, R. Mitdank, Z. Galazka, and S. F. Fischer 

Transport properties and finite size effects in ß-Ga2O3 thin films
R. Ahrling, J. Boy, M. Handwerg, O. Chiatti, R. Mitdank, G. Wagner, Z. Galazka, and S. F. Fischer 
Scientific Reports 9, 13149 (2019).

Temperature dependence of the Seebeck coefficient of epitaxial ß-Ga2O3 thin films
J. Boy, M. Handwerg, R. Ahrling, R. Mitdank, G. Wagner, Z. Galazka, and S. F. Fischer 
APL Mater. 7, 022526 (2019).



Temperature-dependent thermal conductivity and diffusivity of Mg-doped insulating
ß-Ga2O3 single crystal along [100], [010] and [001]

M. Handwerg, R. Mitdank, Z. Galazka, and S. F. Fischer
Semicond. Sci. Technol.31, 125006(2016).
Short abstract

Temperature-dependent thermal conductivity in Mg-doped and undoped ß-Ga2O3 bulk-crystals
M. Handwerg, R. Mitdank, Z. Galazka, and S. F. Fischer
Semicond. Sci. Technol. 30, 024006 (2015).
Short abstract
Invited Article

Semiconductor functional oxides
Guest editors: Saskia F. Fischer and Marius Grundmann
Semicond. Sci. Technol. 30, 020301 (2015).
Special Issue

Temperature-dependent electrical characterization of exfoliated ß-Ga2O3 micro flakes
R. Mitdank, S. Dusari, C. Bülow, M. Albrecht, Z. Galazka, and S. F. Fischer
Phys. Status Solidi A 211, No. 3, 543-549 (2014).
DOI: 10.1002/pssa.201330671
Short abstract

Special Issue 1 "Emerging Semiconducting Oxides"
Oliver Bierwagen and Saskia F. Fischer
Phys. Status Solidi A 211, 19-20 (January 2014).