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Tornberg, Marcus
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Topics
Publications (9/9 displayed)
- 2024Microheater Controlled Crystal Phase Engineering of Nanowires Using In Situ Transmission Electron Microscopycitations
- 2024Microheater Controlled Crystal Phase Engineering of Nanowires Using In Situ Transmission Electron Microscopycitations
- 2022Enabling <i>In Situ</i> Studies of Metal-Organic Chemical Vapor Deposition in a Transmission Electron Microscopecitations
- 2022Enabling In Situ Studies of Metal-Organic Chemical Vapor Deposition in a Transmission Electron Microscopecitations
- 2021Vapor-solid-solid growth dynamics in GaAs nanowirescitations
- 2020Dynamics of a Droplet that Assists III-V Nanowire Growth
- 2020Limits of III-V Nanowire Growth Based on Droplet Dynamicscitations
- 2019Kinetics of Au-Ga Droplet Mediated Decomposition of GaAs Nanowirescitations
- 2017Thermodynamic stability of gold-assisted InAs nanowire growthcitations
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article
Microheater Controlled Crystal Phase Engineering of Nanowires Using In Situ Transmission Electron Microscopy
Abstract
<jats:title>Abstract</jats:title><jats:p>Crystal Phase Quantum Dots (CPQDs) offer promising properties for quantum communication. How CPQDs can be formed in Au‐catalyzed GaAs nanowires using different precursor flows and temperatures by in situ environmental transmission electron microscopy (ETEM) experiments is studied. A III‐V gas supply system controls the precursor flow and custom‐built micro electro‐mechanical system (MEMS) chips with monocrystalline Si‐cantilevers are used for temperature control, forming a micrometer‐scale metal–organic vapor phase epitaxy (µMOVPE) system. The preferentially formed crystal phases are mapped at different precursor flows and temperatures to determine optimal growth parameters for either crystal phase. To control the position and length of CPQDs, the time scale for crystal phase change is investigated. The micrometer size of the cantilevers allows temperature shifts of more than 100 °C within 0.1 s at the nanowire growth temperature, which can be much faster than the growth time for a single lattice layer. For controlling the crystal phase, the temperature change is found to be superior to precursor flow, which takes tens of seconds for the crystal phase formation to react. This µMOVPE approach may ultimately provide faster temperature control than bulk MOVPE systems and hence enable engineering sequences of CPQDs with quantum dot lengths and positions defined with atomic precision.</jats:p>