Nitrogen investigation by SIMS in two wide band-gap semiconductors: Diamond and Silicon Carbide
Résumé
Diamond and Silicon Carbide (SiC) are promising wide band-gap semiconductors for power electronics, SiC being more mature especially in term of large wafer size (that has reached 200 mm quite recently). Nitrogen impurities are often used in both materials for different purpose: increase the diamond growth rate or induce n-type conductivity in SiC. The determination of the nitrogen content by secondary ion mass spectrometry (SIMS) is a difficult task mainly because nitrogen is an atmospheric element for which direct monitoring of N ions give no or a weak signal. With our standard diamond SIMS conditions, we investigate 12C14N-secondary ions under cesium primary ions by applying high mass resolution settings. Nitrogen depthprofiling of diamond and SiC (multi-) layers is then possible over several micrometer thick over reasonable time analysis duration. In a simple way and without notably modifying our usual analysis process, we found a nitrogen detection limit of 2x10 17 at/cm 3 in diamond and 5x10 15 at/cm 3 in SiC.
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