Patent ID: 6566284
Filing Date: 2003-05-20
Classification: B82Y,H01L,Y10S

Abstract:
A method for fabricating a sub-micron resonant tunneling diode comprising:a. providing a layered material comprising a plurality of substantially conforming layers, including i. a top cap and quantum wells layer; ii. a bottom contact layer; and iii. a substrate b. patterning the top cap and quantum wells layer to allow selective etching to the bottom contact layer; c. etching to remove the top cap and quantum wells layer as patterned; d. depositing an ohmic metal to contact only the bottom contact layer; e. patterning the top cap an quantum wells layer to allow selective deposition of a top metal contact; f. depositing the top metal contact; g. removing the top cap and quantum wells layer except where masked by the top metal contact; h. removing the non-local bottom contact layer to form a device; i. passivating the device using a passivating substance in contact with the substrate that substantially fills all voids from the substrate to substantially the top of the ohmic metal and the top metal contacts, substantially enveloping the following: i. the bottom contact layer; ii. the top cap and quantum wells layer; iii. the ohmic metal contact; and iv. the top metal contact; j. removing the passivating substance covering the top of the ohmic metal contact and the top metal contact such that a portion of the ohmic metal contact and a portion of the top metal contact are exposed parallel to or above the passivating substance.