uu.seUppsala University Publications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Charge Transport Phenomena Unique to Diamond
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
Show others and affiliations
2014 (English)In: MRS Online Proceedings Library, Vol. 1591, null-null p.Article in journal (Refereed) Published
Abstract [en]

ABSTRACT Diamond is a unique material in many respects. One of the most well-known extreme properties of diamond is its ultrahardness. This property of diamond actually turns out to have interesting consequences for charge transport, in particular at low temperatures. In fact, the strong covalent bonds that give rise to the ultrahardness results in a lack of short wavelength lattice vibrations which has a strong impact on both electron and hole scattering. In some sense diamond behaves more like a vacuum than other semiconductor materials. In this paper we describe some interesting charge transport properties of diamond and discuss possible novel electronic applications.

Place, publisher, year, edition, pages
Cambridge Journals Online , 2014. Vol. 1591, null-null p.
Keyword [en]
diamond, electrical properties, electron-phonon interactions
National Category
Engineering and Technology
Research subject
Engineering Science with specialization in Science of Electricity
Identifiers
URN: urn:nbn:se:uu:diva-237485DOI: 10.1557/opl.2014.295ISBN: null OAI: oai:DiVA.org:uu-237485DiVA: diva2:768082
Available from: 2014-12-03 Created: 2014-12-03 Last updated: 2015-12-10
In thesis
1. Valley-Polarized Charge Transport in Diamond
Open this publication in new window or tab >>Valley-Polarized Charge Transport in Diamond
2015 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Diamond is a wide bandgap semiconductor with extreme properties such as high thermal conductivity, high breakdown field and high carrier mobilities. These properties together with the possibility to synthesize high purity Single-Crystalline (SC) diamond by Chemical Vapor Deposition (CVD), makes it a really interesting material for electronic devices. The low impurity concentration achieved when fabricating diamonds by CVD allows for a detailed study of the intrinsic electronic properties of diamond, especially at low temperatures when the carrier scattering rate is low.

During the last few years, our group has presented two new phenomena discovered in SC-CVD diamond at temperatures below 150 K. For the very first time, Negative Differential Mobility (NDM) and valley polarization have been observed in diamond. NDM occurs at a temperature range of 110 to 140 K and at an electric field range of 300 to 600 V/cm and has been explained by electron repopulation between different valleys. At temperatures below 100 K, stable valley polarization has been observed due to the low phonon scattering rate in diamond that enable electrons to reside in one valley.

This licentiate thesis will give a short review on electronic properties and charge transport in diamond. It will also present the two discovered phenomena and the methods used to observe them. There will be further discussions of how these discoveries can be used for making future devices, such as the Transferred-Electron Oscillator (TEO) and valleytronic devices.      

Place, publisher, year, edition, pages
Uppsala: Institutionen för teknikvetenskaper, 2015. 51 p.
Series
UURIE / Uppsala University, Department of Engineering Sciences, ISSN 0349-8352
Keyword
CVD diamond, valleytronics, Negative Differential Mobility, NDM, electron polarization, Time-of-Flight, ToF, magnetotransport, carrier transport, drift velocity
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Engineering Science with specialization in Materials Science
Identifiers
urn:nbn:se:uu:diva-261009 (URN)
Presentation
(English)
Supervisors
Available from: 2015-09-07 Created: 2015-08-28 Last updated: 2015-09-15Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Authority records BETA

Kovi, Kiran KumarSuntornwipat, NattakarnMajdi, SamanGabrysch, MarkusHammersberg, JohanIsberg, Jan

Search in DiVA

By author/editor
Kovi, Kiran KumarSuntornwipat, NattakarnMajdi, SamanGabrysch, MarkusHammersberg, JohanIsberg, Jan
By organisation
Electricity
Engineering and Technology

Search outside of DiVA

GoogleGoogle Scholar

doi
isbn
urn-nbn

Altmetric score

doi
isbn
urn-nbn
Total: 375 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf