The Studies of Electrical and Optical Properties of In_2O_3 and Sn-doped In_2O_3 Single Crystals

The electrical,and optical properties of undoped and Sn-doped(ITO)single crystals pre-pared by a flux method are reported.For pure In_2O_3,it is a degenerate semiconductor and thetransport is governed mainly by phonons acoustical scattering at room temperature for ITO.The relation of carrier concentrations with Sn doping concentration and the carrier mobilityis discussed.Some influences dealing with the presence of Pb impurities in single crystal arealso presented.By absorption spectra,the shifts of fundamental transition edge and plasmafrequency,the variation of reflexion slope in infrered region are in good agreement with theelectrical measurement results.The local structural EXAFS measurement provided the infor-mation of the factors which control the electrical conductivity of this material.