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A new bismuth-based transistor has demonstrated promising experimental performance, but the headline claim that it runs “40% faster” and uses “10% less power” is not a direct comparison with a consumer processor. The 2025 study led by Peking University reports measurements from a 2D gate-all-around transistor; its abstract does not state those percentages or establish a production-ready chip.
What the headline is referring to
The claim points to a Peking University-led study, “Low-power 2D gate-all-around logics via epitaxial monolithic 3D integration,” published in Nature Materials on 14 February 2025. The team built a wafer-scale, stacked, single-crystalline 2D gate-all-around (GAA) transistor structure using low-temperature monolithic 3D integration.
Its channel semiconductor is bismuth oxyselenide (Bi2O2Se), integrated with a layered native-oxide dielectric, bismuth selenite (Bi2SeO5). The paper describes an atomically smooth interface between them. “Bismuth transistor” is therefore a shorthand: the device is a particular 2D-material transistor architecture, not a conventional silicon processor with bismuth simply substituted into it.
What the study actually measured
The primary paper reports device-level results, including a scaled transistor with a 30 nm gate length. Its abstract lists these figures:
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- Electron mobility: 280 cm2 V−1 s−1.
- Subthreshold swing: 62 mV dec−1, described by the authors as near-ideal.
- Operating voltage: 0.5 V for the scaled 30 nm gate-length 2D GAA field-effect transistor (FET).
- On-state current: greater than 1 mA μm−1 for that scaled device.
- Intrinsic delay: 1.9 ps.
- Energy-delay product: 1.84 × 10−27 J s μm−1.
These results characterize a transistor, not the speed or power consumption of a complete CPU. A processor benchmark also depends on the rest of the chip’s design and implementation, so the listed measurements cannot by themselves establish how a consumer computer would perform.
How to interpret “40% faster” and “10% less power”
Tom’s Hardware and PC Gamer reported the 40% faster and 10% lower-power framing on 12 March 2025. Those percentages are secondary coverage’s comparison, not figures stated in the abstract of the Nature Materials paper. PC Gamer noted that the comparison basis is unclear, including because Intel and TSMC process nodes are not identical.
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Read the percentages as a reported headline comparison, not as proof that a bismuth transistor or a computer built with it is 40% faster or consumes 10% less power than a named commercial processor. The primary study’s own evidence is the set of device measurements above; the available comparison does not establish a like-for-like consumer-chip benchmark.
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallDoes “wafer-scale” mean it is ready for computers?
No. The paper describes wafer-scale fabrication, an important research result, but that phrase does not mean the process is qualified for mass production or that products using it are available. The authors present the work as a promising route toward beyond-silicon monolithic 3D circuits. That is a research prospect, not a commercial rollout.
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Is this the same as other bismuth transistor research?
No. “Bismuth transistor” can describe distinct materials and architectures. These results should not be blended together:
- The 2025 Peking University-led device: a fabricated 2D GAA FET using Bi2O2Se and Bi2SeO5, with the measurements reported in the Nature Materials paper.
- A separate 2026 PolyU result: a tunnelling field-effect transistor made from alternating 2D bismuth and indium selenide layers. Hong Kong Polytechnic University’s September 2026 report describes room-temperature operation on centimetre-scale silicon, switching below 60 mV per decade across six orders of magnitude of current, and a 160 mV gate-voltage range. It is not the 2025 GAA device or the source of the 40%/10% comparison.
- A 2020 BiN study: a computational analysis of monolayer bismuth nitride (BiN), not a report of the fabricated Bi2O2Se/Bi2SeO5 transistor. The paper in Physical Review Applied modeled sub-10-nm transistor performance using first-principles and nonequilibrium Green’s-function calculations.
Are silicon processors finished?
No. The 2025 work demonstrates a research transistor architecture and reports encouraging device metrics; it does not show that silicon processors are obsolete or that bismuth-based processors are on sale. The result is significant as an investigation of 2D materials and monolithic 3D integration, but the headline percentages do not answer when or whether the approach will appear in consumer devices.
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