Abstract
A rapid and accurate total-reflection XRF method was developed in order to determine the absolute stoichiometry of ternary compounds of the type Cu∶In∶Se. The method was used to determine the composition of the synthesised compounds CuxInyS ez(CIS). Three compounds were synthesised with different atomic proportions x∶y∶z; 1∶3∶5, 2∶4∶7 and the no stoichiometric phase 1∶2.5∶4.75. The results obtained showed a systematic deficiency of In and an increment of Se with respect to the stoichiometric formula.
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