AIP Advances (Jul 2018)

Electronic properties of GaSe/MoS2 and GaS/MoSe2 heterojunctions from first principles calculations

  • Khang D. Pham,
  • Huynh V. Phuc,
  • Nguyen N. Hieu,
  • Bui D. Hoi,
  • Chuong V. Nguyen

DOI
https://doi.org/10.1063/1.5033348
Journal volume & issue
Vol. 8, no. 7
pp. 075207 – 075207-9

Abstract

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In this work, we theoretically investigate electronic properties of GaSeMoS2 and GaSMoSe2 heterojunctions using density functional theory based on first-principles calculations. The results show that both GaSeMoS2 and GaSMoSe2 heterojunctions are characterized by the weak vdW interactions with a corresponding interlayer distance of 3.45 Å and 3.54 Å, and the binding energy of −0.16 eV per GaSeGaS cell. Furthermore, one can observe that both the GaSeMoS2, and GaSMoSe2 heterojunctions are found to be indirect band gap semiconductors with a corresponding band gap of 1.91 eV and 1.23 eV, respectively. We also find that the band gaps of these semiconductors belong to type II band alignment. A type–II band alignment in both GaSeMoS2 and GaSMoSe2 heterojunctions open their potential applications as novel materials such as in designing and fabricating new generation of photovoltaic and optoelectronic devices.