Transient photocurrent measurements in alkali chalcogenide ternary compound semiconductors

Z. Liu, J. A. Peters, H. Li, Mercouri G Kanatzidis, B. W. Wessels

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The charge transport properties of two alkali metal chalcogenide, semiconductor ternary compounds Cs2Cd3Te4 and Cs2Hg6S7, having potential as efficient high-energy radiation detectors, were investigated. A key property that determines the detector performance is the minority carrier lifetime, which was determined by measurement of photocurrent transients using pulsed laser excitation. The alkali metal chalcogenide semiconductor crystals were grown by a modified Bridgman method. The Cs2Cd3Te4 compound has a minority lifetime of 2.45 μs at 295 K, which is comparable to that of cadmium zinc telluride (CZT). The Cs2Hg6S7 showed charge trapping with decay times of 120 μs. The excellent charge transport properties of Cs2Cd3Te4 indicate that this ternary compound semiconductor should be well suited for gamma radiation detector devices that operate at room temperature.

Original languageEnglish
Article number015022
JournalSemiconductor Science and Technology
Volume28
Issue number1
DOIs
Publication statusPublished - Jan 2013

Fingerprint

Alkalies
Photocurrents
Alkali Metals
photocurrents
alkalies
Radiation detectors
radiation detectors
Alkali metals
Semiconductor materials
Transport properties
alkali metals
Charge transfer
transport properties
zinc tellurides
Charge trapping
Crystal growth from melt
Laser excitation
cadmium tellurides
Bridgman method
Carrier lifetime

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry
  • Condensed Matter Physics

Cite this

Transient photocurrent measurements in alkali chalcogenide ternary compound semiconductors. / Liu, Z.; Peters, J. A.; Li, H.; Kanatzidis, Mercouri G; Wessels, B. W.

In: Semiconductor Science and Technology, Vol. 28, No. 1, 015022, 01.2013.

Research output: Contribution to journalArticle

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