Wolfgang Heiß, ao. Univ. Prof. Dr.
 
 
 
 
Room 214
Phone: +43/(0)732/2468-9643
E-mail: wolfgang.heiss@jku.at
 
 

Fig. 1

 
Research interests:
 
The name of my workgroup (NanoMIR) describes the focus of our scientific activities, namely the development of Nanodevices for applications in the Mid Infra Red. These devices are based on various narrow-gap semiconductors which are either epitaxially grown and combined to lead-salt heterostructures for lasers and detectors, or which are based on colloidal nanocrystals. Highlights of these work are e.g., the demonstration of ink-jet printed nanocrystal photodetectors operating up to wavelength of 3 micron, the demonstration of a novel type of quantum dots, fabricated by eptiaxially combining materials with different lattice structures, or the chemical synthesis of novel nanocrystal materials like SnTe. As a second research topic we also develop and study materials for potential spin-electronic applications. Here our activities enclose the modeling of magnetic properties by Monte-Carlo simulations, magneto-transport and magneto-optical experiments on epitaxial layers and the chemical synthesis of novel magnetic materials, like bi-magnetic Wüstite core-metal ferrite shell nanocrystals with controlled sizes and shapes. Besides many international collaborations with other Universities within Europe, USA, Japan and China we also have contracts with industrial partners like W.L. GORE (Putzbrunn, Germany) and SIEMENS (Erlangen, Germany).
 
 
Awards:
 
2002   Start Prize of the Austrian Ministry of Science
 
 
Research Group:
 
NanoMIR-group
 
 
Selected Publications:
 
M. V. Kovalenko, D. V. Talapin, M. A. Loi, F. Cordella, G. Hesser, M. I. Bodnarchuk, W. Heiss
Quasi-seeded growth of ligand-tailored PbSe nanocrystals through cation-exchange mediated nucleation
Angewandte Chemie (2008)
 
M. V. Kovalenko; W. Heiss; E. V. Shevchenko; J. S. Lee; H. Schwinghammer; A. P. Alivisatos; D. V. Talapin
SnTe Nanocrystals: A New Example of Narrow-Gap Semiconductor Quantum Dots
J. Am. Chem. Soc. 129, 11354 (2007)
 
M. V. Kovalenko, M. I. Bodnarchuk, R. T. Lechner, G. Hesser, F. Schäffler, W. Heiss
Fatty Acid Salts as Stabilizers in Size- and Shape-Controlled Nanocrystal Synthesis: the Case of Inverse Spinel Iron Oxide
J. Am. Chem. Soc. 129, 6352 (2007)
 
M. Böberl, M. N. Kovalenko, S. Gamerith, E. List, W. Heiss
Inkjet-printed nanocrystal photodetectors operating up to 3 micron wavelengths
Advanced Materials 19, 3574 (2007)
 
W. Heiss, H. Groiss, E. Kaufmann, G. Hesser, M. Böberl, G. Springholz, F. Schäffler, K. Koike, H. Harada, and M. Yano
Centrosymmteric PbTe/CdTe quantum dots coherently embedded by epitaxial precipitation
Appl. Phys. Lett. 88, 192109 (2006)
 
M.V. Kovalenko, E. Kaufmann, D. Pachinger, J. Roither, M. Huber, J. Stangl, F. Schäffler, W. Heiss
Colloidal HgTe nanocrystals with widely tunable narrow band gap energies: From Telecommunications to molecular-vibrations
J. Am. Chem. Society 128 (11), 3516 (2006)
 
S. Günes, H. Neugebauer, N. S. Sariciftci, J. Roither, M. Kovalenko, G. Pillwein, W. Heiss
Hybrid solar cells using HgTe nanocrystals and nanoporous TiO2 electrodes
Advanced Functional Materials 16, 1095-1099 (2006)
 
J. Fürst, H. Pascher, T. Schwarzl, M. Böberl, G. Springholz, G. Bauer, W. Heiss
Continuous wave emission from a midinfrared IV-VI vertical-cavity surface-emitting laser
Appl. Phys. Lett. 84, 3268 (2004)
 

Fig. 6

(a) A PbTe quantum dot in CdTe matrix fabricated by epitaxially controlled nano- precipitation. The dots exhibit the shape of small-rhombo-cubo-octahedrons (see inset).
(b) Top view on a photoconductive detector fabricated by ink-jet printing of HgTe nanocrystals across interdigitate gold electrodes.
(c) Photoresponse of the HgTe nanocrystal photodetectors.
(d) Iron oxide nanocrystals with cubical shape.
(e) Iron oxide nanocrystals with spherical shape.
(f) Self-ordered PbSe nanocrystal array.