Study Of Thermoelectric Property And Electron Transport Mechanism In Blue Phosphorene Based Nanodevices

With the development of society and scientific technology,the traditional silicon-based devices would be eliminates owing to energy-consuming and inefficient shortcoming.And many two-dimensional semiconductor materials have attracted researches attention,such as graphene and group-? monochalcogenide etc.The different electronic transport properties compare with macroscopic materials makes nanoscale devices become a hotspot.Recently,the black phosphorous has become the focus of science community due to the synthesis of its two-dimensional form,lots of interesting physical properties,for example,high stability,and high carrier mobility have been investigated in experiment.We investigated the electronic properities of different edge type of blue phosphorene nanoribbons based on non-equilibrium Green's function approach combined with density functional theory.The research show that the transport channel of blue phosphorene nanoribbons located in center region under the low bias,carrier mobility will not strongly reduced by edge confusion.All the band gaps of BPNRs linearly decrease with increasing the strength of transverse electric field;it's demonstrated by the Giant Stark effect,in which the Stark coefficient linearly increases with the width of BPNRs,and it is much sensitive to electric field in the aBPNRs than in the zBPNRs when ribbon width more than 3.1nm.These unique and outstanding electric and transport properties make BPNRs become an excellent material for designing Field Electric Transistor.We investigated the thermoelectric properities of different type of blue phosphorene nanoribbons.Different type of blue phosphorene nanoribbons has different thermoelectric properties,besides,thermoelectric property have been influenced by the widths of blue phosphorene nanoribbons,ZT value slowly increase with increasing the widths,by increasing the widths of blue phosphorene nanoribbons,the seebeck coefficient slowly increased,at the same time,enhance the ZT value.In addition,the reduced lattice thermal conductivity can be attributed to the dispersion relations will be significantly modified due to confinements in two directions,and boundary scattering is much stronger in nanoribbons than in bulk system.In order to attach more grateful thermoelectric properties,we investigated the hydrogen saturated methods influenced the thermoelectric.Seebeck coefficient of two edge type of blue phosphorene nanoribbons increasing nearly doubled,hydrogen saturated blue phosphorene nanoribbons could be optimized to exhibit very good thermoelectric performance with a ZT value as high as 3.4 at room temperature.One can obtain the successful systhesis in experiment and simulate in theory,thus realize their possible thermoelectric applications.