The majority of industrial, automobile processes, electrical appliances emit waste heat in the low-temperature range (<573 K), hence efficient thermoelectric materials operating in this range are highly needed. Bismuth telluride (Bi₂Te₃) based alloys are conventional thermoelectric material for the low-temperature application. The pure Bi₂Te₃ sample synthesized in this work exhibits n-type conduction. We demonstrate that by small doping of Pb at Bi site a transition in electrical transport form n- to p-type is observed. The figure-of-merit (ZT) of ntype Bi₂Te₃ is ~0.47 and optimized Bi_1.95Pb_0.05Te₃ exhibit p-type conduction with enhanced ZT of ~0.63 at 386 K. The conversion efficiency of Bi_1.95Pb_0.05Te₃ based single thermoelement with hot pressed Ni/Ag electrical contacts was found to be ~4.9% for a temperature difference (ΔT) of 200 K. The efficiencywas further enhanced to ~12% (at ΔT ~ 494 K) in the segmented thermoelement consisting of Bi_1.95Pb_0.05Te₃ and (AgSbTe₂)_0.15(GeTe)_0.85 (i.e. TAGS-85).