DEFECT CHEMISTRY OF CUINSE2

The defect chemistry model is developed as a function of the nonmolecu larity (DELTAX) and nonstoichiometry (DELTAY), and the formation energ ies of defects are also considered. In this model, the p-type conducti vity can occur in the region with DELTAX < 0 and DELTAY < 0 and n-type conductivity can occur in the region with DELTAX > 0 and DELTAY > 0. For above given regions, it could be possible to define a critical rel ation as DELTAX(c) = 8DELTAY/(I - 2DELTAY). The p-type conductivity oc curs in the DELTAX (more negative value) < DELTAX(c) region at a const ant DELTAY value. As the decreasing of DELTA X negative value, the typ e conversion appears near the DELTAX equals to DELTAX(c) region, and t hen it was dominated by n-type conductivity.