A silver alloyed n-type bismuth telluride (Bi2Te3)thermoelectric (TE) bulk material with nano crystalline structure was studied and characterized in this paper. The Bi2Te3nanopowders used in this study were first fabricated viaa patented explosion based process. Then, the various concentrations of Ag nanoparticles (0-20wt. %) were added into the Bi2Te3nanopowders in order to increase the electrical conductivity. Combining the benefits of high electrical conductivity (1.51×105 S·m-1) and low thermal conductivity (0.441 W·m-1·K-1), the dimensionless figure of merit (ZT value) of 1.48 for this n-type Bi2Te3 TE material is achieved at 300K temperature.