Patent ID: 7112494

Claim:
A method for forming a write once read only memory cell, comprising: forming a metal oxide semiconductor field effect transistor (MOSFET); wherein forming the MOSFET includes: forming a first source/drain region, a second source/drain region, and a channel region between the first and the second source/drain regions in a substrate; forming a gate insulator above the channel region; and forming a gate above the gate insulator; forming an array plate; forming a conductive plug coupling the first source/drain region to the array plate; forming a bitline coupled to the second source/drain region such that the write once read only memory cell can be programmed in a reverse direction to have a trapped charge in the gate insulator adjacent to the first source/drain region by biasing the array plate to a voltage higher than VDD, grounding the bitline, and selecting the gate by a wordline address, and wherein the programmed MOSFET will operate at reduced drain source current in a forward direction.