Adeia Semiconductor Solutions LLC

John R Sporre

Kangguo Cheng

Fee Li Lie

Eric R Miller

Sean Teehan

Marc A Bergendahl

Nicole A Saulnier

Siva Kanakasabapathy

Andrew M Greene

Jeffrey Shearer

Semiconductor devices include a first semiconductor fin. A first gate stack is formed over the first semiconductor fin. Source and drain regions are formed on respective sides of the first gate stack. An interlayer dielectric is formed around the first gate stack. A gate cut plug is formed from a dielectric material at an end of the first gate stack.

FinFET gate cut after dummy gate removal

A method of forming a semiconductor device that includes forming a trench adjacent to a gate structure to expose a contact surface of one of a source region and a drain region. A sacrificial spacer may be formed on a sidewall of the trench and on a sidewall of the gate structure. A metal contact may then be formed in the trench to at least one of the source region and the drain region. The metal contact has a base width that is less than an upper surface width of the metal contact. The sacrificial spacer may be removed, and a substantially conformal dielectric material layer can be formed on sidewalls of the metal contact and the gate structure. Portions of the conformally dielectric material layer contact one another at a pinch off region to form an air gap between the metal contact and the gate structure.

Air gap spacer for metal gates

A method and structures are used to fabricate a nanosheet semiconductor device. Nanosheet fins including nanosheet stacks including alternating silicon (Si) layers and silicon germanium (SiGe) layers are formed on a substrate and etched to define a first end and a second end along a first axis between which each nanosheet fin extends parallel to every other nanosheet fin. The SiGe layers are undercut in the nanosheet stacks at the first end and the second end to form divots, and a dielectric is deposited in the divots. The SiGe layers between the Si layers are removed before forming source and drain regions of the nanosheet semiconductor device such that there are gaps between the Si layers of each nanosheet stack, and the dielectric anchors the Si layers. The gaps are filled with an oxide that is removed after removing the dummy gate and prior to forming the replacement gate.

Nanosheet channel-to-source and drain isolation

Growing community of inventors

Albany, NY, United States of America

John R Sporre