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Electrical and photoconductive properties of GaS 0.75 Se 0.25 mixed crystals
Author(s) -
Karabulut O.,
Parlak M.,
Yįlmaz K.,
Gasanly N. M.
Publication year - 2005
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.200410334
Subject(s) - photoconductivity , photocurrent , thermal conduction , conductivity , atmospheric temperature range , acceptor , scattering , impurity , analytical chemistry (journal) , electron mobility , chemistry , carrier scattering , electrical resistivity and conductivity , materials science , condensed matter physics , optics , optoelectronics , thermodynamics , physics , organic chemistry , chromatography , quantum mechanics , composite material
The conductivity, mobility, photoconductivity and photo response measurements in GaS 0.75 Se 0.25 mixed crystals were carried out in the temperature range of 150‐450 K. The room temperature conductivity, mobility and electron concentration values were 10 ‐9 (Ω‐cm) ‐1 , 48 cm 2 V ‐1 s ‐1 and ∼10 9 cm ‐3 , respectively. Two donor levels were obtained from temperature‐dependent conductivity and carrier concentration, located at energies of about 755 and 465 meV below the conduction band. Single donor‐single acceptor analysis yields the same donor level at 465 meV with donor and acceptor concentrations of 8.7 × 10 14 and 5.3 × 10 13 cm ‐3 , respectively. The mobility‐temperature dependence shows that ionized impurity scattering dominates the conduction up to the temperature 310 K with different temperature exponent, while above this critical temperature; the phonon scattering is dominant conduction mechanism. From the photo‐response spectra, the maximum photocurrent was observed for all the samples at 2.42 eV, and varied slightly with temperature. Moreover, the photocurrent‐light intensity dependence in these crystals obeys the power law, I ph ∝ ϕ γ with γ between 1.7 and 2.0 for various applied fields and temperatures. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)