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基于第一性原理计算方法, 设计出了一种新型二维半导体材料TiO2, 并进一步研究了其结构稳定性, 电子结构, 载流子迁移率和光学性质等. 二维TiO2的形成能、声子谱、分子动力学、弹性常数表明, 二维TiO2具有较好的动力学, 热力学和机械稳定性, 具备实验制备的条件, 且能够稳定存在于常温条件下. 电子结构分析表明, 二维TiO2是一种间接带隙半导体, 在GGA+PBE和HSE06算法下的能隙分别为1.19 eV和2.76 eV, 其价带顶和导带底能级分别由Ti-3d和Ti-4s态电子构成, O原子的电子态在费米能级附近贡献很小, 主要分布在深处能级. 载流子迁移率显示, 二维TiO2的迁移率比单层MoS2要小, 其电子和空穴迁移率分别为31.09和36.29 cm2·V–1·s–1. 由于空穴迁移率和电子迁移率的各向异性, 电子-空穴复合率较低, 使得单层TiO2的使用寿命更长, 光催化活性更好. 在应变调控下, 二维TiO2的能隙发生明显响应, 以适用于各种半导体器件的需要. 半导体的带边势和光学性质显示, 在–5%—2%单/双轴应变下, 二维TiO2能够光裂水制H2, 在–5%—5%单/双轴应变下, 能够光裂水制O2, H2O2和O3等. 此外, 二维TiO2对可见光和紫外光具有较高的吸收系数, 说明其在未来光电子器件和光催化材料领域有着潜在的应用前景.By means of state-of-the-art density functional theory (DFT) computations, We designed a new two-dimensional material TiO2. We further investigated the stability, electronic structure, carrier mobility, and optical properties of monolayer TiO2. Our results show that monolayer TiO2 has good kinetic, thermodynamic and mechanical stability and can exist stably at room temperature. The results were demonstrated using the binding energy, phonon spectrum, molecular dynamics simulation, and elastic constant calculation. The band structure indicates that the monolayer TiO2 is an indirect bandgap semiconductor with energy gaps of 1.19 eV (GGA+PBE) and 2.76 eV (HSE06), respectively. The results of state density show that the Ti-3d state electrons constitute the top of the valence band and Ti-4s state electrons constitute the bottom of the conduction band. The electron states of O atoms contribute very little near the Fermi energy level and are mainly distributed in the deep energy level. In addition, the carrier mobility of monolayer TiO2 is smaller than monolayer MoS2, and the electron and hole mobility can reach 31.09 cm2·V–1·s–1 and 36.29 cm2·V–1·s–1, respectively. Due to the anisotropy of hole mobility and electron mobility, the composite rate of electrons and holes is relatively low. This ensures longer service life and better photocatalytic activity of monolayer TiO2. Furthermore, under the condition of uniaxial strain and biaxial strain, the energy gap of monolayer TiO2 has a clear response. The energy gap is more sensitive to biaxial strain than uniaxial strain, indicating that monolayer TiO2 can be applied to various semiconductor devices. The band-edge potential and optical properties of semiconductors indicate that two-dimensional TiO2 is capable of photo-splitting water production, H2 at –5~2% single/biaxial strain, and O2, H2O2, O3, etc. at –5~5% single/biaxial strain. Moreover, the monolayer TiO2 has a high absorption coefficient for visible and ultraviolet light. In conclusion, the monolayer TiO2 has a potential application prospect in the field of optoelectronic devices and photocatalytic materials in the future.
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Keywords:
- two-dimensional TiO2 /
- first principles /
- electronic structures /
- optical properties
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图 1 二维TiO2的晶体结构 (a) 俯视图; (b) 侧视图; (c) K点路径
Fig. 1. Crystal structure of monolayer TiO2 (a) top view; (b) side view; (c) K point path.
图 4 杨氏模量(左图/蓝色)和泊松比(右图/红色)极坐标图,
$\theta $ 为相对于a轴方向的夹角Fig. 4. Polar coordinates for Young's modulus (left/blue line) and Poisson's ratio (right/red line)
$\theta $ is the angle with respect to the a-direction.
图 5 能带图(左)和分波态密度图(右) (a) 单层P-6M2 TiO2; (b) 单层金红石TiO2; (c) 单层锐钛矿TiO2
Fig. 5. Energy band structure (left) and density of states (right) of (a) monolayer P-6M2 TiO2, (b) monolayer rutile TiO2, (c) monolayer anatase TiO2.
图 7 (a) 二维TiO2沿a/b方向的总能量与应变量
$\Delta l/l$ 的关系, 采用二次数据拟合二维结构的平面刚度, 黑色和红色曲线表示沿a和b方向的面内刚度; (b), (c)单层TiO2的VBM和CBM随应变量相对真空能级的变化, 采取线性拟合计算形变势Fig. 7. (a) The relation between total energy and the applied strain
$\Delta l/l$ along the a/b directions of monolayer TiO2. The quadratic data fitting gives the in-plane stiffness of 2D structures. Black and red curves show the in-plane stiffness along the a and b directions of monolayer TiO2. The shift of VBMs and CBMs for (b-c) monolayer TiO2 with respect to the vacuum energy, as a function of the applied strain along either the a and b direction. The linear fit of the data yields the deformation potential constant.
图 8 单/双轴应变下能隙变化
Fig. 8. Band gap of monolayer TiO2 under uniaxial/biaxial strain, calculated using the HSE06 functional.
图 9 单双/轴应变下单层TiO2光催化示意图
Fig. 9. Schematic diagram of monolayer TiO2 photocatalysis under uniaxial/biaxial strain.
图 10 光学性质 (a) 介电函数虚部; (b) 光吸收系数
Fig. 10. Optical properties: (a) virtual part of dielectric function; (b) absorption coefficient.
表 1 二维TiO2的结构常数和结合能
Table 1. Structure constants and binding energy of monolayer TiO2.
Material a/b/Å ${\theta _1}$/($^ \circ $) ${\theta _2}$/($^ \circ $) l/Å $\sigma $/Å Ef/eV TiO2 2.89 91.66 68.16 2.01 2.26 –8.11 MoS2 3.18 82.58 80.74 2.41 3.14 –7.35 
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表 2 二维TiO2有效质量
${m^ * }$ , 形变势常数$E_{_{\rm{d}}}^i$ , 弹性常数${C^{{\rm{2 D}}}}$ 和载流子迁移率${\mu _{{\rm{2 D}}}}$ Table 2. Calculated effective mass
${m^ * }$ , deformation potential constant$E_{_{\rm{d}}}^i$ , elastic modulus${C^{{\rm{2 D}}}}$ , and carrier mobility${\mu _{{\rm{2 D}}}}$ for monolayer TiO2 along the a ($\zeta \to K$ ) and b ($\zeta \to G$ ) directions, where$\zeta $ represents the position of the valence band top and the conduction band bottom.Carrier type $m_a^ * $/${m_{\rm{e}}}$ $m_b^ * $/${m_{\rm{e}}}$ $m_l^ * $/${m_{\rm{e}}}$ $\left| {{E_{la}}} \right|$/ eV $\left| {{E_{lb}}} \right|$/ eV $C_a^{2{\rm{D}}}$/ N·m–1 $C_b^{{\rm{2 D}}}$/ N·m–1 $\mu _a^{2{\rm{D}}}$/ cm2·V–1·s–1 $\mu _b^{2{\rm{D}}}$/ cm2·V–1·s–1 Electrons 3.21 1.39 2.11 3.43 3.38 21.27 21.28 12.92 30.75 Holes 4.73 4.12 4.41 1.26 1.25 21.27 21.28 31.09 36.29
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[1] Hashimoto A, Suenaga K, Gloter A, Urita K, Iijima S 2004 Nature 430 870
Google Scholar
[2] Liu L, Zhang J, Zhao J, Liu F 2012 Nanoscale 4 5910
Google Scholar
[3] Kvashnin D G, Bellucci S, Chernozatonskii L A 2015 Phys. Chem. Chem. Phys. 17 4354
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[4] Liu Y, Duan X, Huang Y, Duan X 2018 Chem. Soc. Rev. 47 6388
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[5] Gupta S, Kutana A, Yakobson B I 2018 J. Phys. Chem. Lett. 9 2757
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[6] Yuan J, Yu N, Xue K, Miao X 2017 Appl. Surf. Sci. 409 85
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[7] Lee C, Wei X, Kysar J W, Hone J 2008 Science 321 385
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[8] Wang H, Chan T L, Xie Z 2018 Chem. Commun. (Camb) 54 385
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[10] Li P 2019 Phys. Chem. Chem. Phys. 21 11150
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[11] Li L, Yang J 2017 Nanotechnology 28 475701
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Google Scholar
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Google Scholar
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Google Scholar
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