Thermoelectric power of indium sesquisulphide single crystals

The investigation covers a temperature range from 200 to 450 K. Thermoelectric power measurements of In 2 S 3 crystals showed that all samples under investigation have a positive TEP in all temperature ranges, indicating n‐type conductivity for In 2 S 3 crystals. The ratio of the electron and hole mobilities is μ n /μ p = 4.71. The effective mass of electrons m   n *is found to be 0.00008 × 10 −31 kg. The obtained effective masses of holes m   p *= 1.893 × 10 −31 kg. The diffusion coefficient for both carriers (electrons and holes) is evaluated to be 84.71 cm 2 /s and 17.985 cm 2 /s respectively. The mean free time between collision is estimated to be τ n = 1.7 × 10 −20 s, and τ p = 8.5 × 10 −17 s. The estimated diffusion length for electrons is found to be L n = 1.2 × 10 −9 cm and L p = 3.9 × 10 −8 cm.