We focus on two new 2D materials,i.e.,monolayer and bilayer silicon phosphides (Si1 P1).Based on the elastic scattering Green’s function,the electronic-transport properties of two-dimensional monolayer and bilayer AuSi1P1-Au molecular junctions are studied.It is found that their bandgaps are narrow (0.16eV for a monolayer molecular junction and 0.26 eV for a bilayer molecular junction).Moreover,the calculated current-voltage characteristics indicate that the monolayer molecular junction provides constant output current (20 nA) over a wide voltage range,and the bilayer molecular junction provides higher current (42nA).