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Optimization of GaN...
Optimization of GaN Nanowires Reformation Process by Metalorganic Chemical Vapor Deposition for Device-Quality GaN Templates
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- Delgado Carrascon, Rosalia (författare)
- Linköpings universitet,Linköping University,Halvledarmaterial,Tekniska fakulteten
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- Tran, Dat Quoc (författare)
- Linköpings universitet,Linköping University,Halvledarmaterial,Tekniska fakulteten
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- Sukkaew, Pitsiri (författare)
- Linköpings universitet,Linköping University,Kemi,Tekniska fakulteten
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- Mock, Alyssa (författare)
- Linköpings universitet,Linköping University,Naval Research Laboratory,Halvledarmaterial,Tekniska fakulteten,Naval Res Lab, DC 20375 USA
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- Ciechonski, Rafal (författare)
- Ideon Science Park,Hexagem AB, Sweden
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- Ohlsson, Jonas (författare)
- Lund University,Lunds universitet,NanoLund: Centre for Nanoscience,Annan verksamhet, LTH,Lunds Tekniska Högskola,Other operations, LTH,Faculty of Engineering, LTH,Ideon Science Park,Hexagem AB, Sweden; Lund Univ, Sweden
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- Zhu, Yadan (författare)
- Lund University,Lund Univ, Sweden
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- Hultin, Olof (författare)
- Lund University,Lunds universitet,Fasta tillståndets fysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Solid State Physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH,Lund Univ, Sweden
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- Monemar, Bo (författare)
- Linköpings universitet,Linköping University,Halvledarmaterial,Tekniska fakulteten
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- Paskov, Plamen (författare)
- Linköpings universitet,Linköping University,Halvledarmaterial,Tekniska fakulteten
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- Samuelson, Lars (författare)
- Lund University,Lunds universitet,NanoLund: Centre for Nanoscience,Annan verksamhet, LTH,Lunds Tekniska Högskola,Fasta tillståndets fysik,Fysiska institutionen,Institutioner vid LTH,Other operations, LTH,Faculty of Engineering, LTH,Solid State Physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH,Lund Univ, Sweden
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- Darakchieva, Vanya (författare)
- Linköpings universitet,Linköping University,Halvledarmaterial,Tekniska fakulteten
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(creator_code:org_t)
- Wiley, 2020
- 2020
- Engelska.
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Ingår i: Physica Status Solidi (B) Basic Research. - : Wiley. - 0370-1972 .- 1521-3951. ; 257:4
- Relaterad länk:
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http://dx.doi.org/10...
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https://lup.lub.lu.s...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- Herein, the potential of reformed GaN nanowires (NWs) fabricated by metalorganic chemical vapor deposition (MOCVD) for device-quality low-defect density templates and low-cost alternative to bulk GaN substrates is demonstrated. The effects of epilayer thickness and NW reformation conditions on the crystalline quality and thermal conductivity of the subsequent GaN epilayers are investigated. Smooth surfaces with atomically step-like morphologies with no spirals are achieved for GaN epilayers on the reformed NW templates, indicating step-flow growth mode. It is further found that annealing of the NWs at a temperature of 1030 °C in the presence of NH3 and H2, followed by a coalescence done at the same temperature under planar growth conditions, leads to the most efficient screw dislocation density reduction by nearly an order of magnitude. At these optimized conditions, the growth takes place in a layer-by-layer fashion, producing a smooth surface with a root mean square (RMS) roughness of 0.12 nm. The highest thermal conductivity of k = 206 W m−1 K−1, approaching the respective value of bulk GaN, is obtained for the optimized 2 μm-thick GaN layer. The thermal conductivity results are further discussed in terms of the phonon-dislocation and the phonon-boundary scattering.
Ämnesord
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Nyckelord
- dislocation densities
- GaN
- nanowires
- thermal conductivity
- dislocation densities; GaN; nanowires; thermal conductivity
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- ref (ämneskategori)
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Delgado Carrasco ...
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Tran, Dat Quoc
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Sukkaew, Pitsiri
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Mock, Alyssa
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Ciechonski, Rafa ...
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Ohlsson, Jonas
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visa fler...
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Zhu, Yadan
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Hultin, Olof
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Monemar, Bo
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Paskov, Plamen
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Samuelson, Lars
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Darakchieva, Van ...
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