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Injection-dependent lifetime measurements in low oxygen oxide precipitate-containing samples which have (a) not been intentionally contaminated; and (b) to (d) been contaminated with iron at the temperature shown followed by a rapid cool. Dislocations and stacking faults were found to surround the precipitates in sample (b), but not the other samples. All the experimental data can be fitted using the same two defects, with the αnN parameters stated.
Residual minority carrier lifetime versus for low oxygen samples containing oxide precipitates rubbed with iron and heated to different temperatures followed by a rapid cool. The concentration of strained precipitates is 1.2 × 109 cm−3 in all cases.
Bulk iron concentrations measured in specimens with and without pre-existing oxide precipitates contaminated with iron followed by a rapid cool. Within experimental error, the bulk iron concentration is the same, or lower, in specimens containing oxide precipitates.
The SRH parameter αnN per strained precipitate for both defects plotted against the iron lost from the bulk given by Eq. (2) per precipitate. The data shown are for low oxygen specimens in which dislocations, and in some cases, stacking faults surround the precipitates.
Injection-dependent lifetime measurements in low oxygen oxide precipitate-containing samples contaminated with iron at 745 °C. The higher lifetime sample was subjected to the usual rapid cool. The lower lifetime sample experienced the temperature profile shown in the inset, followed by a rapid cool from 550 °C to room temperature.
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