lisaaine, mis viiakse keemilisesse materjali, et muuta selle algseid elektrilisi või optilisi omadusi iseloomustavaid mõõtesuurusi, kusjuures muutuste tekitamiseks vajalik lisaaine kogus on tavaliselt väga väike
trace of impurity element that is introduced into a chemical material to alter its original electrical or optical properties, whereat the amount of dopant necessary to cause changes is typically very low
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