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FM: Fachverband Funktionsmaterialien
FM 2: Energy Materials
FM 2.7: Vortrag
Montag, 9. März 2026, 11:15–11:30, BEY/0138
Thermoelectric properties of In-doped Bi2Te3 crystalline bulk alloys — •Alaa Adam1 and E. Ibrahim2 — 1Sohag University — 2Sohag university
Influence of indium doping on the structure, morphology and thermoelectric properties of bulk Bi2Te3 is investigated in the current work. Bi2Te3 and Bi2-xInxTe3 crystalline bulk samples have been fabricated using a simple mono-temperature melting method. Analyses employing X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques proved the existence of the concerned phases. In addition, morphology and internal structure have been examined via the scanning electron microscopes and the energy dispersive X-ray (EDX) spectroscopy. Thermoelectric properties were determined in a temperature range between 300*700 K. The electrical conductivity (σ) against the temperature showed metallic-like behavior. Carrier concentration has increased with in-doping. The Seebeck coefficients (S) of the synthesized alloys proved the domination of n-type conduction due to consistently negative S values. The largest Seebeck coefficient was recorded at 203.5 *V/ K which was observed at 700 K for the pristine Bi2Te3 sample. The highest power factor was found at PF = 5.46 mWm-1K-2, obtained for Bi2Te3 at room temperature. Thermal conductivity was measured and studied against temperature elevation. It was found that the thermal conductivity of the In-doped Bi1.98In0.02Te3 alloys are significantly reduced compared with that of the pure Bi2Te3 material.
Keywords: Bi2Te3; In-doping; Electrical properties; Thermoelectric measurements; Figure of merit