Journal Article

FZJ-2020-05020

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Phase-Pure Wurtzite GaAs Nanowires Grown by Self-Catalyzed Selective Area Molecular Beam Epitaxy for Advanced Laser Devices and Quantum Disks

Jansen, M. M. (Corresponding author)FZJ* ; Perla, P.FZJ* ; Kaladzhian, M.FZJ* ; von den Driesch, N.FZJ* ; Janssen, J.FZJ* ; Luysberg, M.FZJ* ; Lepsa, M. I.FZJ* ; Grützmacher, D.FZJ* ; Pawlis, A. (Corresponding author)FZJ*

2020
ACS Publications Washington, DC

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Please use a persistent id in citations: http://hdl.handle.net/2128/26400  doi:10.1021/acsanm.0c02241

Abstract: The control of the crystal phase in self-catalyzed nanowires (NWs) is one of the central remaining open challenges in the research field of III/V semiconductor NWs. While several groups analyzed and revealed the growth dynamics, no experimental growth scheme has been verified yet, which reproducibly ensures the phase purity of binary self-catalyzed grown NWs. Here, we demonstrate the advanced control of self-catalyzed molecular beam epitaxy of GaAs NWs with up to a grade of 100% wurtzite (WZ) phase purity. The evolution of the most important properties during the growth, namely, the contact angle of the Ga droplet, the NW length, and the diameter is analyzed by scanning electron microscopy and transmission electron microscopy. Based on these results, we developed a comprehensive NW growth model for calculating the time-dependent evolution of the Ga droplet contact angle. Using this model, the Ga flux was dynamically modified during the growth to control and stabilize the contact angle in a certain range favoring the growth of phase-pure GaAs NWs. Although focusing on the self-catalyzed growth of WZ GaAs NWs, our model is also applicable to achieve phase-pure zinc blende (ZB) NWs and can be easily generalized to other III/V compounds. The self-catalyzed growth of such NWs may pave the way for substantial improvement of GaAs NW laser devices, the controlled growth of WZ/ZB quantum disks, and novel heterostructured core/multishell NW systems with a pristine crystalline order.

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Contributing Institute(s):

1. Halbleiter-Nanoelektronik (PGI-9)
2. Physik Nanoskaliger Systeme (ER-C-1)
3. JARA Institut Green IT (PGI-10)

Research Program(s):

1. 524 - Controlling Collective States (POF3-524) (POF3-524)
2. 143 - Controlling Configuration-Based Phenomena (POF3-143) (POF3-143)
3. DFG project 390534769 - EXC 2004: Materie und Licht für Quanteninformation (ML4Q) (390534769) (390534769)
4. DFG project 337456818 - Entwicklung von Spin-Qubit Bauelementen aus ZnSe/ (337456818)

Appears in the scientific report 2020

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Database coverage:
; ; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; Essential Science Indicators ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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