| A semiconductor device includes a semiconductor substrate unit, a two-dimensional material layer formed on the semiconductor substrate unit and composed of a transition metal dichalcogenides, two single crystals, and two metallic electrode layers. The single crystals are spaced apart over the two-dimensional material layer. Each single crystal is composed of a first metal material or an intermetallic compound composed of the first metal material and a second metal material. The metallic electrode layers are composed of the second metal material and each metallic electrode layer contacts a respective corresponding single crystal. In the present disclosure, the first metal material has a first melting point, and the second metal material has a second melting point, and the first melting point is lower than the second melting point. This invention also provides a method for making the semiconductor device stated above. |