A molecular static model of a CuInSe2 crystal is constructed, and the energ
ies of formation of isolated defects are calculated. An analysis of the int
eraction between defects shows that, for a high defect concentration (excee
ding 1%), the energies of interaction between defects can considerably exce
ed the values obtained in the continuous medium approximation. It is found
that the role of interaction between defects in quantum-chemistry calculati
ons using the model of supercells (periodic defect) is considerably underes
timated. (C) 2000 MAIK "Nauka/Interperiodica".