Patent ID: 7615439

Claim:
A method comprising: forming a trench, the trench having a bottom and a sidewall; forming a first diode electrode in the trench during a single damascene process, the first diode electrode having a first portion parallel to the bottom of the trench and a second portion parallel to the sidewall; forming a first insulating region comprising a first insulating material in the trench during the single damascene process, the first insulating region having a first portion parallel to the bottom of the trench and a second portion parallel to the sidewall; forming a second insulating region comprising a second insulating material in the trench during the single damascene process, the second insulating region having a first portion parallel to the bottom of the trench and a second portion parallel to the sidewall; forming a second diode electrode in the trench during the single damascene process, the first insulating region and the second insulating region reside between the first diode electrode and the second diode electrode to form a metal-insulator-insulator-metal (MIIM) diode; and forming a region of carbon in the trench during the single damascene process, at least a portion of the carbon is electrically in series with the MIIM diode.