InGaP/GaAs HBT with novel layer structure for emitter ledge fabrication


A novel HBT structure has been utilized to fabricate emitter ledges using a simple, selective wet chemical etch process. This structure eliminates the need for photoresist or dielectric etch masks in the fabrication of self-aligned ledges and enables the use of highly-selective wet chemical etches in forming an InGaP ledge. Small-area devices have been… (More)


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