Transition metal doping of GaSe implemented with low temperature liquid phase growth

Nuo Lei, Youhei Sato, Tadao Tanabe, Kensaku Maeda, Yutaka Oyama

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Our group works on improving the conversion efficiencies of terahertz (THz) wave generation using GaSe crystals. The operating principle is based on difference frequency generation (DFG) which has the advantages such as high output power, a single tunable frequency, and room temperature operation. In this study, GaSe crystals were grown by the temperature difference method under controlled vapor pressure (TDM-CVP). It is a liquid phase growth method with temperature 300 °C lower than that of the Bridgman method. Using this method, the point defects concentration is decreased and the polytype can be controlled. The transition metal Ti was used to dope the GaSe in order to suppress free carrier absorption in the low frequency THz region. As a result, a deep acceptor level of 38 meV was confirmed as being formed in GaSe with 1.4 at% Ti doping. Compared with undoped GaSe, a decrease in carrier concentration (~1014 cm−3) at room temperature was also confirmed. THz wave transmittance measurements reveal the tendency for the absorption coefficient to increase as the amount of dopant is increased. It is expected that there is an optimum amount of dopant.

Original languageEnglish
Pages (from-to)94-97
Number of pages4
JournalJournal of Crystal Growth
Volume460
DOIs
Publication statusPublished - 2017 Feb 15

Keywords

  • A1. Point defects
  • A2. Growth from melt
  • A3. Liquid phase epitaxy
  • B1. Gallium compounds
  • B2. Semiconducting gallium compounds
  • B3. Nonlinear optical

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Inorganic Chemistry
  • Materials Chemistry

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