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
	Title	Excitonic Aharonov-Bohm oscillations in core-shell nanowires
	Source	Adv. Mater. , 31 , 1805645 ( 2019 )
DOI : 10.1002/adma.201805645 \| 3041 Cite : Bibtex RIS @article{ author = { P. Corfdir and O. Marquardt and R. B. Lewis and C. Sinito and M. Ramsteiner and A. Trampert and U. Jahn and L. Geelhaar and O. Brandt and V. M. Fomin }, title = { Excitonic Aharonov-Bohm oscillations in core-shell nanowires }, journal = { Advanced Materials }, volume = { 31 }, year = { 2019 }, pages = { 1805645 } } P. Corfdir, O. Marquardt, R. B. Lewis, C. Sinito, M. Ramsteiner, A. Trampert, U. Jahn, L. Geelhaar, O. Brandt, and V. M. Fomin TY - JOUR AU - P. Corfdir AU - O. Marquardt AU - R. B. Lewis AU - C. Sinito AU - M. Ramsteiner AU - A. Trampert AU - U. Jahn AU - L. Geelhaar AU - O. Brandt AU - V. M. Fomin TI - Excitonic Aharonov-Bohm oscillations in core-shell nanowires JF - Advanced Materials JA - Adv. Mater. J1 - VL - 31 SP - 1805645 PY - 2019/01/15

3	Author	R. B. Lewis , P. Corfdir , H. Küpers , T. Flissikowski , O. Brandt , L. Geelhaar
	Title	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 @article{ author = { R. B. Lewis and P. Corfdir and H. Küpers and T. Flissikowski and O. Brandt and L. Geelhaar }, title = { Nanowires bending over backward from strain partitioning in asymmetric core-shell heterostructures }, journal = { Nano Letters }, volume = { 18 }, year = { 2018 }, pages = { 2343 } } R. B. Lewis, P. Corfdir, H. Küpers, T. Flissikowski, O. Brandt, and L. Geelhaar TY - JOUR AU - R. B. Lewis AU - P. Corfdir AU - H. Küpers AU - T. Flissikowski AU - O. Brandt AU - L. Geelhaar TI - Nanowires bending over backward from strain partitioning in asymmetric core-shell heterostructures JF - Nano Letters JA - Nano Lett. J1 - VL - 18 SP - 2343 PY - 2018/03/23

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
	Title	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 @article{ author = { P. Corfdir and H. Li and O. Marquardt and G. Gao and M. R. Molas and J. K. Zettler and D. van Treeck and T. Flissikowski and M. Potemski and C. Draxl and A. Trampert and S. Fernández-Garrido and H. T. Grahn and O. Brandt }, title = { Crystal-phase quantum wires: One-dimensional heterostructures with atomically flat interfaces }, journal = { Nano Letters }, volume = { 18 }, year = { 2018 }, pages = { 247 } } 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 TY - JOUR AU - P. Corfdir AU - H. Li AU - O. Marquardt AU - G. Gao AU - M. R. Molas AU - J. K. Zettler AU - D. van Treeck AU - T. Flissikowski AU - M. Potemski AU - C. Draxl AU - A. Trampert AU - S. Fernández-Garrido AU - H. T. Grahn AU - O. Brandt TI - Crystal-phase quantum wires: One-dimensional heterostructures with atomically flat interfaces JF - Nano Letters JA - Nano Lett. J1 - VL - 18 SP - 247 PY - 2018/01/10

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
	Title	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 @article{ author = { J. K. Zettler and P. Corfdir and C. Hauswald and E. Luna and U. Jahn and T. Flissikowski and E. Schmidt and C. Ronning and A. Trampert and L. Geelhaar and H. T. Grahn and O. Brandt and S. Fernández-Garrido }, title = { Observation of dielectrically confined excitons in ultrathin GaN nanowires up to room temperature }, journal = { Nano Letters }, volume = { 16 }, year = { 2016 }, pages = { 973 } } 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 TY - JOUR AU - J. K. Zettler AU - P. Corfdir AU - C. Hauswald AU - E. Luna AU - U. Jahn AU - T. Flissikowski AU - E. Schmidt AU - C. Ronning AU - A. Trampert AU - L. Geelhaar AU - H. T. Grahn AU - O. Brandt AU - S. Fernández-Garrido TI - Observation of dielectrically confined excitons in ultrathin GaN nanowires up to room temperature JF - Nano Letters JA - Nano Lett. J1 - VL - 16 SP - 973 PY - 2016/02/10