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A. IDBAHA1, A. NAFIDI1,* , K. KHALLOUQ1, H. CHARIFI1, H. CHAIB1, B. M. SOUCASE2, M. A. MOLLAR GARCÍA2, K. CHANDER SINGH3, A. KHALAL1, M. MASSAQ1, T. EL GOUTI1, T. AIT TALEB1
- Laboratory of Condensed Matter Physics and Nanomaterials for Renewable Energy, Faculty of Sciences; University Ibn Zohr, Agadir, Morocco
- Laboratory of Optoelectronics, Universitat Politècnica de València, Spain.
- Department of chemistry, M.D.University, Rohtak, India
We report here the effect of temperature in bands structure performed in the envelope function formalism, effective mass and magneto- transport properties of n-type HgTe (d1=8.6 nm) /CdTe (d2=3.2 nm) superlattices (SLs). When d2 increase the gap Eg( Γ) decrease to zero, at the transition semiconductor to semimetal conductivity, and become negative accusing a semimetallic conduction after the point T’(d2T’, ET’). d2T’ and ET’ increases with temperature and removes the transition to higher d2. Eg( Γ) increases from 48 meV at 4.2 K to 105 meV at 300K. The Fermi level is constant (EF(2D) ≈90 meV) until 77K and increases to 167 meV at 300K. Our Theoretical calculations have provided good agreement with the experimental data. The formalism used here predicts that the system is semiconductor for our ratio d1/d2 = 2.69, when d2 < 100 nm. In our case, d2=3.2 nm and Eg (Γ,77K) = 60 meV so this sample is a two-dimensional far-infrared detector semiconductor (12 µm<λc<28 µm)..
Superlattice HgTe / CdTe, Band structure, Magneto-transport properties, Effective mass, envelope function formalism, Hall effect, Shubnikov-de Haas effect, Far infrared detector..
Submitted at: Sept. 28, 2013
Accepted at: Nov. 7, 2013
A. IDBAHA, A. NAFIDI, K. KHALLOUQ, H. CHARIFI, H. CHAIB, B. M. SOUCASE, M. A. MOLLAR GARCÍA, K. CHANDER SINGH, A. KHALAL, M. MASSAQ, T. EL GOUTI, T. AIT TALEB, Effect of temperature in bands structure, effective mass and correlation with magneto- transport properties in a nanostructure far-infrared detector superlattice, Journal of Optoelectronics and Advanced Materials Vol. 15, Iss. 11-12, pp. 1275-1279 (2013)
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