Type

Journal Article

Authors

Justin D. Holmes
Michael A. Morris
Tomasz Ochalski
Achintya Singha
Moneesh Upmanyu
Dipanwita Majumdar
Quentin Ramasse
Dzianis Saladukha
Jessica Doherty
Subhajit Biswas

Subjects

Chemistry

Topics
induction noble metal catalysts materials science physical chemistry germanium nanowires physical sciences nanotechnology

Non-equilibrium induction of tin in germanium: towards direct bandgap Ge1-xSnx nanowires (2016)

Abstract The development of non-equilibrium group IV nanoscale alloys is critical to achieving new functionalities, such as the formation of a direct bandgap in a conventional indirect bandgap elemental semiconductor. Here, we describe the fabrication of uniform diameter, direct bandgap Ge1-xSnx alloy nanowires, with a Sn incorporation up to 9.2[thinsp]at.%, far in excess of the equilibrium solubility of Sn in bulk Ge, through a conventional catalytic bottom-up growth paradigm using noble metal and metal alloy catalysts. Metal alloy catalysts permitted a greater inclusion of Sn in Ge nanowires compared with conventional Au catalysts, when used during vapour-liquid-solid growth. The addition of an annealing step close to the Ge-Sn eutectic temperature (230[thinsp][deg]C) during cool-down, further facilitated the excessive dissolution of Sn in the nanowires. Sn was distributed throughout the Ge nanowire lattice with no metallic Sn segregation or precipitation at the surface or within the bulk of the nanowires. The non-equilibrium incorporation of Sn into the Ge nanowires can be understood in terms of a kinetic trapping model for impurity incorporation at the triple-phase boundary during growth.
Collections Ireland -> University College Cork -> Materials Chemistry and Analysis Group
Ireland -> University College Cork -> College of Science, Engineering and Food Science
Ireland -> University College Cork -> Tyndall National Institute
Ireland -> University College Cork -> Micro-Nanoelectronics Centre
Ireland -> University College Cork -> Chemistry
Ireland -> University College Cork -> Materials Chemistry and Analysis Group - Journal articles
Ireland -> University College Cork -> Chemistry - Journal Articles
Ireland -> University College Cork -> Research Institutes and Centres

Full list of authors on original publication

Justin D. Holmes, Michael A. Morris, Tomasz Ochalski, Achintya Singha, Moneesh Upmanyu, Dipanwita Majumdar, Quentin Ramasse, Dzianis Saladukha, Jessica Doherty, Subhajit Biswas

Experts in our system

1
Justin D. Holmes
University College Cork
Total Publications: 287
 
2
Michael A. Morris
University College Cork
Total Publications: 164
 
3
Tomasz J. Ochalski
University College Cork
Total Publications: 17
 
4
Achintya Singha
University College Cork
Total Publications: 8
 
5
Dipanwita Majumdar
University College Cork
Total Publications: 4
 
6
Quentin Ramasse
University College Cork
Total Publications: 5
 
7
Dzianis Saladukha
University College Cork
Total Publications: 6
 
8
Jessica Doherty
University College Cork
Total Publications: 12
 
9
Subhajit Biswas
University College Cork
Total Publications: 43