III-V Nanowires for Optoelectronics

Advanced structures with tailored functionality

In the nanowire geometry, the chemical composition can be changed in both the axial and the radial direction, leading to corresponding heterostructures and/or doping profiles. Such design concepts still strongly resemble established planar structures. Beyond those strategies, we investigate more advanced structures with the aim to tailor functionality in entirely new directions. For example, we synthesize nanowire heterostructures that are bent in a pre-defined way and employ the resulting complex strain gradients to influence radiative recombination processes. In addition, in many III-V nanowires both the wurtzite and zincblende crystal structure form. We exploit this polytypism to study crystal phase quantum structures of various dimensionalities with inherently atomically sharp interfaces and free from alloy disorder. In combination with compositional heterostructures, we realize complex topologies like quantum rings. Furthermore, we utilize dielectric confinement to modify radiative recombination in ultrathin nanowires.


We recently concluded the project InterPhase that was funded by the Federal Ministry of Education and Research. This project was devoted to charge and energy transfer processes at hybrid organic/inorganic semiconductor interfaces. Our main contribution to this project was the successful passivation of GaN nanowires with organic molecules resulting in a fivefold increase of the nanowires' radiative efficiency.



4 Author P. Corfdir , O. Marquardt , R. B. Lewis , C. Sinito , M. Ramsteiner , A. Trampert , U. Jahn , L. Geelhaar , O. Brandt , V. M. Fomin

Excitonic Aharonov-Bohm oscillations in core-shell nanowires

Source Adv. Mater. , 31 , 1805645 ( 2019 )
DOI : 10.1002/adma.201805645 | 3041 Cite : Bibtex RIS
P. Corfdir, O. Marquardt, R. B. Lewis, C. Sinito, M. Ramsteiner, A. Trampert, U. Jahn, L. Geelhaar, O. Brandt, and V. M. Fomin

3 Author R. B. Lewis , P. Corfdir , H. Küpers , T. Flissikowski , O. Brandt , L. Geelhaar

Nanowires bending over backward from strain partitioning in asymmetric core-shell heterostructures

Source Nano Lett. , 18 , 2343 ( 2018 )
DOI : 10.1021/acs.nanolett.7b05221 | 2989 Cite : Bibtex RIS
R. B. Lewis, P. Corfdir, H. Küpers, T. Flissikowski, O. Brandt, and L. Geelhaar

2 Author P. Corfdir , H. Li , O. Marquardt , G. Gao , M. R. Molas , J. K. Zettler , D. van Treeck , T. Flissikowski , M. Potemski , C. Draxl , A. Trampert , S. Fernández-Garrido , H. T. Grahn , O. Brandt

Crystal-phase quantum wires: One-dimensional heterostructures with atomically flat interfaces

Source Nano Lett. , 18 , 247 ( 2018 )
DOI : 10.1021/acs.nanolett.7b03997 | 2978 Cite : Bibtex RIS
P. Corfdir, H. Li, O. Marquardt, G. Gao, M. R. Molas, J. K. Zettler, D. van Treeck, T. Flissikowski, M. Potemski, C. Draxl, A. Trampert, S. Fernández-Garrido, H. T. Grahn, and O. Brandt

1 Author J. K. Zettler , P. Corfdir , C. Hauswald , E. Luna , U. Jahn , T. Flissikowski , E. Schmidt , C. Ronning , A. Trampert , L. Geelhaar , H. T. Grahn , O. Brandt , S. Fernández-Garrido

Observation of dielectrically confined excitons in ultrathin GaN nanowires up to room temperature

Source Nano Lett. , 16 , 973 ( 2016 )
DOI : 10.1021/acs.nanolett.5b03931 | 2739 Cite : Bibtex RIS
J. K. Zettler, P. Corfdir, C. Hauswald, E. Luna, U. Jahn, T. Flissikowski, E. Schmidt, C. Ronning, A. Trampert, L. Geelhaar, H. T. Grahn, O. Brandt, and S. Fernández-Garrido


Dr. Lutz Geelhaar

Head of Department

+49 30 20377-359


Dr. Oliver Brandt

Senior Scientist

+49 30 20377-332

lab: -444