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Title: Novel hetero-bilayered materials for photovoltaics

Journal Article · · Applied Materials Today
 [1]
  1. Harbin Institute of Technology (China); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)

The recently synthesized GaS and MoSe2 nanosheets have been used as appropriate substrates for other layered materials, e.g. silicene/GaS heterosheets akin to graphene/BN systems. Here, we have performed a comprehensive first-principles study of the electronic and optical properties of two-dimensional (2D) GaS/MoSe2 hetero-bilayers based on density functional theory (DFT). Here we found almost all proposed GaS/MoSe2 hetero-bilayers in the current study have an indirect band gap from the Γ point to the K point, except for one with a direct band gap at the K point. Tunable band gaps GaS/MoSe2 hetero-bilayers can be controlled by strain modulation. State-of-the-art GW-Bethe–Salpeter method, accounting for electron-electron and electron-hole interactions, has been employed to compute accurate absorbance spectra for layered materials. Compared with its composing GaS and MoSe2 monolayers, GaS/MoSe2 hetero-bilayers show superior behavior on optical absorbance, indicating a stronger visible-light absorption and applications in solar energy harvesting. We foresee that the novel GaS/MoSe2 hetero-bilayers would stimulate the fabrication of materials with unprecedented optical and physico-chemical properties that may apply in nanodevices and photovoltaic cells.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC); Central Universities of China
Grant/Contract Number:
AC02-05CH11231; AC05-00OR22750; AUGA5710013115
OSTI ID:
1565423
Alternate ID(s):
OSTI ID: 1397336
Journal Information:
Applied Materials Today, Vol. 2, Issue C; ISSN 2352-9407
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 267 works
Citation information provided by
Web of Science

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