Claim Construction: IBM's Backside Transistor Integrated With a Backside Power Network

Backside power delivery moves the power rails to the wafer back. IBM Research's mid-2025 grant pushes the idea further: put active transistors on the back side too, integrated with the backside power network. International Business Machines Corporation is exploring whether the back of the wafer can become device real estate, not just wiring.

US12341099B2, "Semiconductor backside transistor integration with backside power delivery network" (issued 2025-06-24), is classified under the newer H10D taxonomy - H10D 84/0149, H10D 88/101, H10D 30/6735 - with H01L 23/5286 and H01L 23/481 for the backside interconnect. The claim is on integrating a backside transistor with the backside power delivery network (BSPDN).

Construe the integration limitation. Backside power alone places only metal on the back. This claim places an active device there and ties it into the backside power network - which raises hard questions of thermal budget, alignment to front-side devices, and how the backside transistor is fabricated after the wafer is flipped and thinned. The claim fences the specific integration scheme.

Note the CPC migration to H10D classes. The patent office's 2023 reclassification of semiconductor devices into the H10 range shows up here, and tracking it matters for portfolio searches - the same technology now spans the legacy H01L and new H10D codes, and a search that misses one undercounts the thicket.

The design-around space is broad because this is frontier work. A competitor keeping all active devices on the front (conventional BSPDN) avoids the claim entirely; the value is purely in the backside-device approach, which is still pre-production. The claim is a priority-date stake more than a near-term blocking weapon.

For an R&D strategist, this is IBM doing what IBM does: filing far ahead of manufacturing on a concept that may define a node two generations out. Whether backside transistors become real is uncertain, but if they do, IBM's 2025 family will be an early anchor, and the H10D classification is the marker to watch the field by.