Humboldt-Universität zu Berlin - Faculty of Mathematics and Natural Sciences - Novel Materials

Novel Semiconductor Materials

novel semiconductor round.pngCurrently under investigation are a range of novel semiconductor materials. Gallium oxide (Ga2O3), for example, is one of the few conducting transparent oxides. Most transparent materials are insulating rather than conducting. Therefore, Ga2O3 has the potential, for example, to help make much thinner displays than those currently manufactured.

Ga2O3 is highly important for measurements of thermal conductivity, as heat is highly 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 durability and heat transport.


Novel Materials Group
Prof. Dr. Saskia F. Fischer  email


Associated researchers
Dr. Rüdiger Mitdank  email
MSc. Robin Ahrling  email
MSc. Sakhir Shibli  email
BSc. Alexander Spyrantis  email
Maximilian Steuer email



Further research topics

Ultra-thin layers | Nanostructures | Quantum systems


Selected Publications


Thermal conductivity, diffusivity and specific heat capacity of as-grown, degenerate single-crystalline ZnGa2O4
J. Boy, R. Mitdank, Z. Galazka, and S. F. Fischer
Mater. Res. Express 9, 065902 (2022).
DOI:10.1088/2053-1591/ac5f8a
Short abstract

Thermal and electrical conductivity of single crystalline kesterite Cu2ZnSnS4
M. Handwerg, R. Mitdank, S. Levcenco, S. Schorr, and S. F. Fischer
Mater. Res. Express 117, 105908 (2020).
DOI:10.1088/2053-1591
Short abstract

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
AIP Advances 10, 055005 (2020).
DOI:10.1063/5.0002847
Short abstract

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).
DOI:10.1038/s41598-019-49238-2
Short abstract

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).
DOI:10.1063/1.5084791
Short abstract

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).
DOI:10.1088/0268-1242/31/12/125006
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).
DOI:10.1088/0268-1242/30/2/024006
Short abstract
Invited Article

Semiconductor functional oxides
Guest editors: Saskia F. Fischer and Marius Grundmann
Semicond. Sci. Technol. 30, 020301 (2015).
DOI:10.1088/0268-1242/30/2/020301
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).


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