Abstract: A reverse self-aligned field effect transistor having sub-quarter micrometer (<0.25 um) channel lengths and shallow source/drain junction depths was achieved. The method for fabricating the FET includes a conducting layer that is deposited and patterned over the source/drain areas of the FET. The sub-quarter micrometer channel length was achieved by reducing the channel opening formed in the conducting layer using sidewall spacer techniques. The conducting layer on the substrate and under the source/drain polysilicon layer also serves as an interface to the diffusing source/drain dopants, and shallow junctions are formed that are about 0.06 to 0.08 um depth. The conducting layer also serves as a low resistant ohmic contact to the source/drain areas.