A first-principles study: single-layer TiS2 modified by non-metal doping

In this paper, the effect of substitutional doping of boron (B), carbon (C), nitrogen (N), oxygen (O), and phosphorus (P) at the S-site on the electronic structure of the monolayer TiS2 system is investigated using a first-principles calculation method. The effect of nonmetal doping on the band gap of TiS2 and its mechanism were studied by analyzing the stability, electronic structure, and charge transfer of the system. By calculating the electron cloud overlap population and formation energy, we confirmed that the system is stable, and the Ti-X bond length of the doped system undergoes different degrees of distortion. The properties of the B, C, and N doped system show different properties with different doping concentrations; the band gap of the O-atom system gradually expands with the rise of the doping rate. The hybridization positions of the impurity and the intrinsic atoms are found by comparing the DOS; combined with the charge density difference, we confirmed the interaction of impurity atoms with the system and revealed the bonding process of different systems.

Automated summary

In this paper, the effect of substitutional doping of boron (B), carbon (C), nitrogen (N), oxygen (O), and phosphorus (P) at the S-site on the electronic structure of monolayer TiS2 system is investigated. The stability, electronic structure, and charge transfer of the system were analyzed to study the effect and mechanism of nonmetal doping on the band gap of TiS2. The results show that the doped system is stable and the Ti-X bond length undergoes distortion to different degrees. The properties of the doped system vary with different doping concentrations, and the doping of O-atom gradually expands the band gap. By comparing the DOS and charge density difference, the interaction of impurity atoms with the system and the bonding process of different systems are revealed.