Thermoelectric power generators are promising for clean energy production through converting the waste heat to electricity in environmentally friendly ways without any noise or pollutants. This work reports a facile method to synthesize Bi 2 Te 3 nanoflakes with an investigation of their structural, optical, and thermoelectric properties. Various techniques such as X-ray diffraction, field emission scanning electron microscope, transmission electron microscope, and energy dispersive spectroscopy are used to characterize the synthesized compound. The results confirmed that the nanoflakes crystallize in a rhombohedral structure with an average diameter and thickness %31.2 and 27 nm, respectively. A narrow optical band gap of 0.43 eV is determined for the prepared nanoflakes confirming the potential of employing the nanoflakes in optoelectronic applications. The results of the thermoelectric measurements imply that the synthesized nanoflakes have high power factor values at high temperatures compared to those previously reported for the same compound by other research groups. The power factor values make the synthesized nanoflakes promising candidate for thermoelectric applications.