Huge operation by energy gap of novel narrow band gap Tl1−xIn1−xBxSe2 (B = Si, Ge): DFT, x-ray emission and photoconductivity studies
It is shown that narrow band gap semiconductors Tl1−xIn1−xGexSe2 are able effectively to vary the values of the energy gap. DFT simulations of the principal bands during the cationic substitutions is done. Changes of carrier transport features is explored. Relation with the changes of the near the s...
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Published in | Materials research express Vol. 3; no. 2 |
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Main Authors | , , , , , , , , |
Format | Journal Article |
Language | English |
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IOP Publishing
03.02.2016
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Abstract | It is shown that narrow band gap semiconductors Tl1−xIn1−xGexSe2 are able effectively to vary the values of the energy gap. DFT simulations of the principal bands during the cationic substitutions is done. Changes of carrier transport features is explored. Relation with the changes of the near the surface states is explored . Comparison on a common energy scale of the x-ray emission Se Kβ2 bands, representing energy distribution of the Se 4p states, indicates that these states contribute preliminary to the top of the valence band. The temperature dependence of electrical conductivity and spectral dependence photoconductivity for the Tl1−xIn1−xGexSe2 and Tl1−xIn1−xSixSe2 single crystals were explored and compared with previously reported Tl1−xIn1−xSnxSe2. Based on our investigations, a model of centre re-charging is proposed. Contrary to other investigated crystals in Tl1−xIn1−xGexSe2 single crystals for x = 0.1 we observe extraordinarily enormous photoresponse, which exceed more than nine times the dark current. X-ray photoelectron core-level and valence-band spectra for pristine and Ar+-ion irradiated surfaces of Tl1−xIn1−xGexSe2 (x = 0.1 and 0.2) single crystals have been studied. These results indicate that the relatively low hygroscopicity of the studied single crystals is typical for the Tl1−xIn1−xGexSe2 crystals, a property that is very important for handling these quaternary selenides as infrared materials operating at ambient conditions. |
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AbstractList | It is shown that narrow band gap semiconductors Tl1−xIn1−xGexSe2 are able effectively to vary the values of the energy gap. DFT simulations of the principal bands during the cationic substitutions is done. Changes of carrier transport features is explored. Relation with the changes of the near the surface states is explored . Comparison on a common energy scale of the x-ray emission Se Kβ2 bands, representing energy distribution of the Se 4p states, indicates that these states contribute preliminary to the top of the valence band. The temperature dependence of electrical conductivity and spectral dependence photoconductivity for the Tl1−xIn1−xGexSe2 and Tl1−xIn1−xSixSe2 single crystals were explored and compared with previously reported Tl1−xIn1−xSnxSe2. Based on our investigations, a model of centre re-charging is proposed. Contrary to other investigated crystals in Tl1−xIn1−xGexSe2 single crystals for x = 0.1 we observe extraordinarily enormous photoresponse, which exceed more than nine times the dark current. X-ray photoelectron core-level and valence-band spectra for pristine and Ar+-ion irradiated surfaces of Tl1−xIn1−xGexSe2 (x = 0.1 and 0.2) single crystals have been studied. These results indicate that the relatively low hygroscopicity of the studied single crystals is typical for the Tl1−xIn1−xGexSe2 crystals, a property that is very important for handling these quaternary selenides as infrared materials operating at ambient conditions. |
Author | Parasyuk, O V Kityk, I V Albassam, A Piasecki, M Zamurueva, O V Khyzhun, O Y Myronchuk, G L Fedorchuk, A O El-Naggar, A M |
Author_xml | – sequence: 1 givenname: M surname: Piasecki fullname: Piasecki, M organization: Institute of Physics, J. Dlugosz University Czestochowa, Armii Krajowej13/15,Czestochowa, Poland – sequence: 2 givenname: G L surname: Myronchuk fullname: Myronchuk, G L organization: Physical Department, Eastern European University, 13 Voli Ave., 43025 Lutsk, Ukraine – sequence: 3 givenname: O V surname: Zamurueva fullname: Zamurueva, O V organization: Physical Department, Eastern European University, 13 Voli Ave., 43025 Lutsk, Ukraine – sequence: 4 givenname: O Y surname: Khyzhun fullname: Khyzhun, O Y organization: Frantsevych Institute for Problems of Materials Science, National Academy of Sciences of Ukraine, 3 Krzhyzhanivsky St., 03142 Kyiv, Ukraine – sequence: 5 givenname: O V surname: Parasyuk fullname: Parasyuk, O V organization: Department of Inorganic and Physical Chemistry, Eastern European Univeristy, National University, 13 Voli Ave., 43025 Lutsk, Ukraine – sequence: 6 givenname: A O surname: Fedorchuk fullname: Fedorchuk, A O organization: Department of Inorganic and Organic Chemistry, Lviv National University of Veterinary Medicine and Biotechnologies, Piekarska St. 50, 79010 Lviv, Ukraine – sequence: 7 givenname: A surname: Albassam fullname: Albassam, A organization: Research Chair of Exploitation of Renewable Energy Applications in Saudi Arabia, Physics and Astronomy Department, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia – sequence: 8 givenname: A M surname: El-Naggar fullname: El-Naggar, A M organization: Physics department, Faculty of Science, Ain Shams University, Abassia, Cairo 11566, Egypt – sequence: 9 givenname: I V surname: Kityk fullname: Kityk, I V email: iwank74@gmail.com organization: Faculty of Electrical Engineering, Czestochowa University Technology. Armii Krajowej 17, PL-42201, Czestochowa, Poland |
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Snippet | It is shown that narrow band gap semiconductors Tl1−xIn1−xGexSe2 are able effectively to vary the values of the energy gap. DFT simulations of the principal... |
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SubjectTerms | chalcogenides narrow band gap semiconductors pseudopotential calculations |
Title | Huge operation by energy gap of novel narrow band gap Tl1−xIn1−xBxSe2 (B = Si, Ge): DFT, x-ray emission and photoconductivity studies |
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