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Abstract
The objectives of this study were to study the output efficiency of n-type and p-type Bi2Te3 thermoelectric materials (ingot) for applying as a thermoelectric generator (TEG). The phase analysis of Bi2Te3 was performed by X-ray diffraction (XRD). The results indicated that most diffraction peaks of the XRD patterns of Bi2Te3 sample present a rhombohedral Bi2Te3 structure. The scanning electron microscopy (SEM) was investigated bulk Bi2Te3 samples revealed their surface morphology after polishing. This result can be seen in these figures that the high homogeneity of all bulk samples resulted in a highly dense microstructure. The density value of bulk Bi2Te3 was approximately 98%. Before measurement, both n-type and p-type Bi2Te3 were cut as cell rod about 0.5 * 0.5 * 2 cm and the silver paint was paint at both surfaces as the electrode. For investigation of the output efficiency, the temperature at hot surface was set at 100 ˚C. The temperature differences (ΔT) were found that the ΔT of n-type Bi2Te3 thermoelectric cell rod was observed at about 60 ˚C. Moreover, a voltage and a current of n-type Bi2Te3 thermoelectric cell rod were observed at about 9.1 mV and 1.75 uA, respectively. However, good output efficiency was observed in the p-type Bi2Te3 thermoelectric cell rod with ΔT of about 65 ˚C and a voltage and current were observed about 12.8 mV and 4.32 uA, respectively. Notably, the good output efficiency of p-type Bi2Te3 is higher than n-type Bi2Te3 because the figure-of-merit (ZT) value of p-type Bi2Te3 is higher than n-type Bi2Te3. Then the difference of leg height of the p-type Bi2Te3 thermoelectric cell rod was investigated. These results indicated that the output efficiency of p-type Bi2Te3 thermoelectric cell rod is dependent on the height of p-type Bi2Te3 thermoelectric leg.
Keywords: n-type Bi2Te3, and p-type Bi2Te3, figure-of-merit (ZT), bulk Bi2Te3
