PDI -> Staff ->

Dr. Lutz Geelhaar

Acting Director

Head of Department Epitaxy

Lutz Geelhaar

phone: +49 30 20377 359

room: 0714

email: geelhaar@pdi-berlin.de

 

Department: Epitaxy

Core research areas: Nanofabrication , III-V nanowires for optoelectronics

 

 

1 Author M. Al-Humaidi , L. Feigl , J. Jakob , P. Schroth , A. AlHassan , A. Davtyan , J. Herranz , T. Anjum , D. Novikov , S. Francoual , L. Geelhaar , T. Baumbach , U. Pietsch
Title

In situ x-ray analysis of misfit strain and curvature of bent polytypic GaAs–InxGa1−xAs core–shell nanowires

Source Nanotechnology , 33 , 015601 ( 2021 )
DOI : 10.1088/1361-6528/ac29d8 | Download arXiv: 2105.09665 | 3270 Cite : Bibtex RIS
M. Al-Humaidi, L. Feigl, J. Jakob, P. Schroth, A. AlHassan, A. Davtyan, J. Herranz, T. Anjum, D. Novikov, S. Francoual, L. Geelhaar, T. Baumbach, and U. Pietsch

2 Author Hanno Küpers , Ryan B. Lewis , Pierre Corfdir , Michael Niehle , T. Flissikowski , H. T. Grahn , A. Trampert , O. Brandt , L. Geelhaar
Title

Drastic effect of sequential deposition resulting from flux directionality for the luminescence efficiency of nanowire shells

Source ACS Appl. Mater. Interfaces , 13 , 50220 ( 2021 )
DOI : 10.1021/acsami.1c12371 | Download arXiv: 2106.12309 | 3255 Cite : Bibtex RIS
Hanno Küpers, Ryan B. Lewis, Pierre Corfdir, Michael Niehle, T. Flissikowski, H. T. Grahn, A. Trampert, O. Brandt, and L. Geelhaar

3 Author D. Bahrami , A. Al Hassan , A. Davtyan , R. Zhe , T. Anjum , J. Herranz , L. Geelhaar , D. V. Novikov , R. Timm , U. Pietsch
Title

Impact of electrical current on single GaAs nanowire structure

Source Phys. Status Solidi B , 258 , 2100056 ( 2021 )
DOI : 10.1002/pssb.202100056 | 3257 Cite : Bibtex RIS
D. Bahrami, A. Al Hassan, A. Davtyan, R. Zhe, T. Anjum, J. Herranz, L. Geelhaar, D. V. Novikov, R. Timm, and U. Pietsch

4 Author T. Auzelle , M. Azadmand , T. Flissikowski , M. Ramsteiner , K. Morgenroth , C. Stemmler , S. Fernández-Garrido , S. Sanguinetti , H. T. Grahn , L. Geelhaar , O. Brandt
Title

Enhanced radiative efficiency in GaN nanowires grown on sputtered TiNx

Source ACS Photonics , 8 , 1718 ( 2021 )
DOI : 10.1021/acsphotonics.1c00224 | Download arXiv: 2001.06387 | 3166 Cite : Bibtex RIS
T. Auzelle, M. Azadmand, T. Flissikowski, M. Ramsteiner, K. Morgenroth, C. Stemmler, S. Fernández-Garrido, S. Sanguinetti, H. T. Grahn, L. Geelhaar, and O. Brandt

5 Author A. Al Hassan , W. A. Salehi , R. B. Lewis , T. Anjum , C. Sternemann , L. Geelhaar , U. Pietsch
Title

Transition from elastic to plastic strain release in core−shell nanowires revealed by in-plane x-ray diffraction

Source Nanotechnology , 32 , 205705 ( 2021 )
DOI : 10.1088/1361-6528/abe5db | 3244 Cite : Bibtex RIS
A. Al Hassan, W. A. Salehi, R. B. Lewis, T. Anjum, C. Sternemann, L. Geelhaar, and U. Pietsch

6 Author L. Jaloustre , S. Le-Denmat , T. Auzelle , M. Azadmand , L. Geelhaar , F. Dahlem , R. Songmuang
Title

Toward Quantitative Measurements of Piezoelectricity in III-N Semiconductor Nanowires

Source ACS Appl. Nano Mater. , 4 , 43 ( 2021 )
DOI : 10.1021/acsanm.0c02078 | Download arXiv: 1910.01187 | 3243 Cite : Bibtex RIS
L. Jaloustre, S. Le-Denmat, T. Auzelle, M. Azadmand, L. Geelhaar, F. Dahlem, and R. Songmuang

7 Author J. Kamimura , M. Budde , P. Bogdanoff , C. Tschammer , F. F. Abdi , R. van de Krol , O. Bierwagen , H. Riechert , L. Geelhaar
Title

Protection Mechanism against Photocorrosion of GaN Photoanodes Provided by NiO Thin Layers

Source Sol. RRL , 4 , 2000568 ( 2020 )
DOI : 10.1002/solr.202000568 | 3172 Cite : Bibtex RIS
J. Kamimura, M. Budde, P. Bogdanoff, C. Tschammer, F. F. Abdi, R. van de Krol, O. Bierwagen, H. Riechert, and L. Geelhaar

8 Author A. Davtyan , D. Kriegner , V. Holý , A. AlHassan , R.B. Lewis , S. McDermott , L. Geelhaar , D. Bahrami , T. Anjum , Z. Ren , C. Richter , D. Novikov , J. Müller , B. Butz , U. Pietsch
Title

X-ray diffraction reveals the amount of strain and homogeneity of extremely bent single nanowires

Source J. Appl. Cryst. , 53 , 1310 ( 2020 )
DOI : 10.1107/S1600576720011516 | 3222 Cite : Bibtex RIS
A. Davtyan, D. Kriegner, V. Holý, A. AlHassan, R.B. Lewis, S. McDermott, L. Geelhaar, D. Bahrami, T. Anjum, Z. Ren, C. Richter, D. Novikov, J. Müller, B. Butz, and U. Pietsch

9 Author Y. Zhao , Z. Xing , L. Geelhaar , J. Zhang , W. Yang , T. Auzelle , Y. Wu , L. Bian , S. Lu
Title

Detaching highly flexible and transparent (In,Ga)N nanowire films by a low-cost and stable electrochemical procedure

Source ACS Appl. Nano Mater. , 3 , 9943 ( 2020 )
DOI : 10.1021/acsanm.0c01970 | 3202 Cite : Bibtex RIS
Y. Zhao, Z. Xing, L. Geelhaar, J. Zhang, W. Yang, T. Auzelle, Y. Wu, L. Bian, and S. Lu

10 Author M. Aghaeipour , L. Kasper , J. Herranz , L. Geelhaar , J. Bruns
Title

Efficient adjustable light couplers of integrated III–V nanowire emitters on silicon waveguides based on ring resonators

Source Opt. Lett. , 45 , 4702 ( 2020 )
DOI : 10.1364/OL.398930 | 3210 Cite : Bibtex RIS
M. Aghaeipour, L. Kasper, J. Herranz, L. Geelhaar, and J. Bruns