2020年9月
Ultrafast spatiotemporal photocarrier dynamics near GaN surfaces studied by terahertz emission spectroscopy
SCIENTIFIC REPORTS
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- 巻
- 10
- 号
- 1
- 開始ページ
- 14633
- 終了ページ
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1038/s41598-020-71728-x
- 出版者・発行元
- NATURE RESEARCH
Gallium nitride (GaN) is a promising wide-bandgap semiconductor, and new characterization tools are needed to study its local crystallinity, carrier dynamics, and doping effects. Terahertz (THz) emission spectroscopy (TES) is an emerging experimental technique that can probe the ultrafast carrier dynamics in optically excited semiconductors. In this work, the carrier dynamics and THz emission mechanisms of GaN were examined in unintentionally doped n-type, Si-doped n-type, and Mg-doped p-type GaN films. The photocarriers excited near the surface travel from the excited-area in an ultrafast manner and generate THz radiation in accordance with the time derivative of the surge drift current. The polarity of the THz amplitude can be used to determine the majority carrier type in GaN films through a non-contact and non-destructive method. Unique THz emission excited by photon energies less than the bandgap was also observed in the p-type GaN film.
- リンク情報
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- DOI
- https://doi.org/10.1038/s41598-020-71728-x
- PubMed
- https://www.ncbi.nlm.nih.gov/pubmed/32884079
- Web of Science
- https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000571229700125&DestApp=WOS_CPL
- Scopus
- https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85090114371&origin=inward 本文へのリンクあり
- Scopus Citedby
- https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85090114371&origin=inward
- URL
- http://www.nature.com/articles/s41598-020-71728-x.pdf
- URL
- http://www.nature.com/articles/s41598-020-71728-x
- ID情報
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- DOI : 10.1038/s41598-020-71728-x
- ISSN : 2045-2322
- eISSN : 2045-2322
- PubMed ID : 32884079
- SCOPUS ID : 85090114371
- Web of Science ID : WOS:000571229700125