Concentration dependences at the critical temperatures in vacuum topotaxial Ag2Se thin layers

K. Somogyi, G. Sáfrán

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Ag2Se thin epitaxial layers were grown under vacuum conditions. The starting components were evaporated sequentially on various substrates and followed by annealing to obtain topotaxial layers, which were either poly- or monocrystalline, depending on the substrate. Ag2Se undergoes a reversible first order phase transition at about 133 °C. The temperatures of the phase transitions are different on heating and cooling and these transitions and associated hysteresis can be demonstrated also by Hall measurements of electron concentration and electron mobility. The mobility shows a sudden decrease at the critical temperature on heating and a sudden increase on cooling. In the present experiments concentration dependences of the mobilities and of the resistivity at the critical temperatures defining the onset of hysteresis (four points), were measured for both types of structure. The μ(n) and ρ(n) dependences show a c0n-c power type character with exponents -0.33 and -0.43 for mobilities and -0.58 and -0.72 for the resistivity. The slopes are only slightly different for the poly- and monocrystalline samples. Also the ratios of c0-s are about 1.4 and 1.6, respectively.

Original languageEnglish
Pages (from-to)350-355
Number of pages6
JournalVacuum
Volume80
Issue number4
DOIs
Publication statusPublished - Oct 28 2005

Fingerprint

critical temperature
Vacuum
vacuum
Hysteresis
Phase transitions
Cooling
Heating
Electron mobility
hysteresis
Epitaxial layers
Substrates
cooling
Temperature
electrical resistivity
heating
electron mobility
Annealing
Electrons
exponents
slopes

Keywords

  • AgSe
  • Charge carrier mobility
  • Electrical properties
  • Phase transition
  • Semi-ionic crystals

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Condensed Matter Physics
  • Surfaces and Interfaces

Cite this

Concentration dependences at the critical temperatures in vacuum topotaxial Ag2Se thin layers. / Somogyi, K.; Sáfrán, G.

In: Vacuum, Vol. 80, No. 4, 28.10.2005, p. 350-355.

Research output: Contribution to journalArticle

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