Abstract
hbox {Sb}_2hbox {S}_3 and hbox {Sb}_2hbox {Se}_3 are well-known layered bulk structures with weak van der Waals interactions. In this work we explore the atomic lattice, dynamical stability, electronic and optical properties of hbox {Sb}_2hbox {S}_3, hbox {Sb}_2hbox {Se}_3 and hbox {Sb}_2hbox {Te}_3 monolayers using the density functional theory simulations. Molecular dynamics and phonon dispersion results show the desirable thermal and dynamical stability of studied nanosheets. On the basis of HSE06 and PBE/GGA functionals, we show that all the considered novel monolayers are semiconductors. Using the HSE06 functional the electronic bandgap of hbox {Sb}_2hbox {S}_3, hbox {Sb}_2hbox {Se}_3 and hbox {Sb}_2hbox {Te}_3 monolayers are predicted to be 2.15, 1.35 and 1.37 eV, respectively. Optical simulations show that the first absorption coefficient peak for hbox {Sb}_2hbox {S}_3, hbox {Sb}_2hbox {Se}_3 and hbox {Sb}_2hbox {Te}_3 monolayers along in-plane polarization is suitable for the absorption of the visible and IR range of light. Interestingly, optically anisotropic character along planar directions can be desirable for polarization-sensitive photodetectors. Furthermore, we systematically investigate the electrical transport properties with combined first-principles and Boltzmann transport theory calculations. At optimal doping concentration, we found the considerable larger power factor values of 2.69, 4.91, and 5.45 for hole-doped hbox {Sb}_{{2}}hbox {S}_{{3}}, hbox {Sb}_{{2}}hbox {Se}_{{3}}, and hbox {Sb}_{{2}}hbox {Te}_{{3}}, respectively. This study highlights the bright prospect for the application of hbox {Sb}_2hbox {S}_3, hbox {Sb}_2hbox {Se}_3 and hbox {Sb}_2hbox {Te}_3 nanosheets in novel electronic, optical and energy conversion systems.
Highlights
Sb2S3 and Sb2Se3 are well-known layered bulk structures with weak van der Waals interactions
There is a large number of monolayers that used in nanodevices, catalysis, field-effect transistors, batteries, hydrogen evolution, and supercapacitors are based on the exfoliated layered materials, for example but not limited to, Bi2Se3 and Bi2Te39, MoS210, WS2 and MoSe211, MoTe212, WSe213, CaGe14, MnPS3 and MnPSe315,16
We found that the valance band minimum (VBM) of Sb2Se3 and Sb2Te3 originates from Se/Te-px,y orbitals, while the conduction band maximum (CBM) consists of Se/Te-pz and Sb-pz orbital states
Summary
Sb2S3 and Sb2Se3 are well-known layered bulk structures with weak van der Waals interactions. The layered semiconductor chalcogenides belonging to the V-VI family has drawn significant attention due to its exceptional properties, such as earth-abundant constituents, low toxicity[21,22], optical, electronic and thermoelectric p roperties[23]. According to their semiconducting nature, these material allow overcoming the deficiencies of zero-bandgap in the graphene, showing gorgeous potential for building memory switching[24], microelectronics, and photovoltaic devices[25,26]. These experimental studies have demonstrated that Sb2X3(X= S, Se, Te) can be efficiently used as potential material for various applications
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