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Deep UV Emission from Highly Ordered AlGaN/AlN Core–Shell Nanorods
Three-dimensional core–shell nanostructures could resolve key problems existing in conventional planar deep UV light-emitting diode (LED) technology due to their high structural quality, high-quality nonpolar growth leading to a...
Deep UV Emission from Highly Ordered AlGaN/AlN Core–Shell Nanorods
Three-dimensional core–shell nanostructures could resolve key problems existing in conventional planar deep UV light-emitting diode (LED) technology due to their high structural quality, high-quality nonpolar growth leading to a...
A systematic comparison of polar and semipolar Si-doped AlGaN alloys with high AlN content
Abstract
With a view to supporting the development of ultra-violet light-emitting diodes and related devices, the compositional, emission and morphology properties of Si-doped...
L Spasevski, Gunnar Kusch, P Pampili, VZ Zubialevich, DV Dinh, J Bruckbauer, PR Edwards, PJ Parbrook, RW Martin
Oct 23, 2020
Hybrid top-down/bottom-up fabrication of regular arrays of AlN nanorods for deep-UV core-shell LEDs
Pierre-marie Coulon, Gunnar Kusch, Emmanuel Le Boulbar, Pierre Chausse, C. G. Bryce, R. W. Martin, Philip Shields
May 01, 2018
Core–shell nanostructures are predicted to highly improve the efficiency of deep-UV light emitting diodes (LEDs), owing to their low defect density, reduced quantum-confined Stark effect, high-quality non-polar growth and...
Using pulsed mode scanning electron microscopy for cathodoluminescence studies on hybrid perovskite films
Jordi Ferrer Orri, Elizabeth M Tennyson, Gunnar Kusch, Giorgio Divitini, Stuart Macpherson, Rachel A Oliver, Caterina Ducati, Samuel D Stranks
May 20, 2021
Abstract: The use of pulsed mode scanning electron microscopy cathodoluminescence (CL) for both hyperspectral mapping and time-resolved measurements is found to be useful for the study of hybrid perovskite films, a class of...
Hybrid top-down/bottom-up fabrication of regular arrays of AlN nanorods for deep-UV core-shell LEDs
Pierre-marie Coulon, Gunnar Kusch, Emmanuel Le Boulbar, Pierre Chausse, C. G. Bryce, R. W. Martin, Philip Shields
May 01, 2018
Core–shell nanostructures are predicted to highly improve the efficiency of deep-UV light emitting diodes (LEDs), owing to their low defect density, reduced quantum-confined Stark effect, high-quality non-polar growth and...
A systematic comparison of polar and semipolar Si-doped AlGaN alloys with high AlN content
Lucia Spasevski, Gunnar Kusch, Pietro Pampili, Vitaly Z Zubialevich, Duc V Dinh, Jochen Bruckbauer, Paul R Edwards, Peter J Parbrook, Robert W Martin
Oct 23, 2020
Abstract: With a view to supporting the development of ultra-violet light-emitting diodes and related devices, the compositional, emission and morphology properties of Si-doped n-type Al x Ga1-x N alloys are extensively...
Using pulsed mode scanning electron microscopy for cathodoluminescence studies on hybrid perovskite films
Jordi Ferrer Orri, Elizabeth M Tennyson, Gunnar Kusch, Giorgio Divitini, Stuart Macpherson, Rachel A Oliver, Caterina Ducati, Samuel D Stranks
May 20, 2021
Abstract: The use of pulsed mode scanning electron microscopy cathodoluminescence (CL) for both hyperspectral mapping and time-resolved measurements is found to be useful for the study of hybrid perovskite films, a class of...
Understanding the Role of Grain Boundaries on Charge‐Carrier and Ion Transport in Cs 2 AgBiBr 6 Thin Films
Zewei Li, Satyaprasad P. Senanayak, Linjie Dai, Gunnar Kusch, Ravichandran Shivanna, Youcheng Zhang, Dipika Pradhan, Junzhi Ye, Yi‐Teng Huang, Henning Sirringhaus, Rachel A. Oliver, Neil C. Greenham, Richard H. Friend, Robert L. Z. Hoye
Sep 08, 2021
RESEARCH ARTICLE RESEARCH ARTICLES carrier mobilities grain boundaries ion migration lead‐free double perovskites thin film transistors
Published by: Advanced Functional Materials
Powerfully nilpotent groups of rank 2 or small order
In this paper, we continue the study of powerfully nilpotent groups. These are powerful p-groups possessing a central series of a special kind. To each such group, one can attach a powerful nilpotency class that leads...
AlN overgrowth of nano-pillar-patterned sapphire with different offcut angle by metalorganic vapor phase epitaxy
S. Walde, S. Hagedorn, P.-m. Coulon, A. Mogilatenko, C. Netzel, J. Weinrich, N. Susilo, E. Ziffer, L. Matiwe, C. Hartmann, Gunnar Kusch, A. Alasmari, G. Naresh-Kumar, C. Trager-Cowan, T. Wernicke, T. Straubinger, M. Bickermann, Robert W. Martin, P.A. Shields, M. Kneissl, M. Weyers
Feb 01, 2020
We present overgrowth of nano-patterned sapphire with different offcut angles by metalorganic vapor phase epitaxy. Hexagonal arrays of nano-pillars were prepared via Displacement Talbot Lithography and dry-etching. 6.6 µm...
AlN overgrowth of nano-pillar-patterned sapphire with different offcut angle by metalorganic vapor phase epitaxy
S. Walde, S. Hagedorn, P.-m. Coulon, A. Mogilatenko, C. Netzel, J. Weinrich, N. Susilo, E. Ziffer, L. Matiwe, C. Hartmann, Gunnar Kusch, A. Alasmari, G. Naresh-Kumar, C. Trager-Cowan, T. Wernicke, T. Straubinger, M. Bickermann, Robert W. Martin, P.A. Shields, M. Kneissl, M. Weyers
Feb 01, 2020
We present overgrowth of nano-patterned sapphire with different offcut angles by metalorganic vapor phase epitaxy. Hexagonal arrays of nano-pillars were prepared via Displacement Talbot Lithography and dry-etching. 6.6 µm...
Compositional Mapping of the AlGaN Alloy Composition in Graded Buffer Structures Using Cathodoluminescence
Herein, the use of cathodoluminescence (CL) hyperspectral mapping in the quantification of the AlGaN alloy composition in graded buffer structures is explored. The quantification takes advantage of the known parabolic dependence...
Point Defects in InGaN/GaN Core–Shell Nanorods
K Loeto, G Kusch, P-M Coulon, SM Fairclough, E Le Boulbar, I Girgel, PA Shields, RA Oliver
Mar 08, 2021
Abstract: Core-shell nanorod based light-emitting diodes (LEDs) with their exposed non-polar surfaces have the potential to overcome the limitations of planar LEDs by circumventing the quantum confined stark effect. In this...
Point Defects in InGaN/GaN Core-Shell Nanorods
Abstract
Core-shell nanorod based light-emitting diodes (LEDs) with their exposed non-polar surfaces have the potential to overcome the limitations of planar LEDs by circumventing...
K Loeto, G Kusch, PM Coulon, SM Fairclough, EL Boulbar, I Girgel, PA Shields, RA Oliver
Jan 10, 2022
On the Hirsch-Plotkin radical of stability groups
Gunnar Traustason
Mar 01, 2015
We study the stability group of subspace series of infinite dimensional vector spaces. In [1], the authors proved that when the vector space has countable dimension then the Hirsch–Plotkin radical of the stability group...
Normal right Engel subgroups of compact Hausdorff groups
Gunnar Traustason
Nov 15, 2014
Let G be a finitely generated compact Hausdorff topological group and let H be a closed normal subgroup consisting of right Engel elements. We show that H belongs to some term of the upper central series of G.
Symplectic alternating algebras
Gunnar Traustason
Jun 01, 2008
This paper begins the development of a theory of what we will call symplectic alternating algebras. They have arisen in the study of 2-Engel groups but seem also to be of interest in their own right. The main part of the paper...
Normal right Engel subgroups of compact Hausdorff groups
Gunnar Traustason
Nov 15, 2014
Let G be a finitely generated compact Hausdorff topological group and let H be a closed normal subgroup consisting of right Engel elements. We show that H belongs to some term of the upper central series of G.
Open problems from the conference “engel conditions in groups” held in bath, UK, 2019
Gunnar Traustason
Dec 31, 2020
Here is list of open problems from the conference Engel Type Conditions in Groups in Bath that was held in April 2019.
Powerful 2-Engel groups II
Gunnar Traustason
Jan 01, 0001
We conclude our classification of powerful 2-Engel groups of class three that are minimal in the sense that every proper powerful section is nilpotent of class at most two. In the predecessor to this paper we obtained three...
On triple homomorphisms of Lie algebras
Let L and K be two Lie algebras over a commutative ring with identity. In this paper, under some conditions on L and K, it is proved that every triple homomorphism from L onto K is the sum of a homomorphism and an...
Symplectic alternating algebras
Gunnar Traustason
Jun 01, 2008
This paper begins the development of a theory of what we will call symplectic alternating algebras. They have arisen in the study of 2-Engel groups but seem also to be of interest in their own right. The main part of the paper...
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