Three separate research efforts point to different bottlenecks in gallium nitride power electronics and RF1. radio frequencyHigh-frequency electromagnetic oscillations used, for example, to excite plasmas.2. resonance frequencyQuantity describing a signal’s frequency, bandwidth, spectral behavior or transmission rate. integration: breakdown voltage, contact resistance, and thermal management. Together, they show how GaNgallium nitrideGaN is another material platform mentioned for use in different power delivery roles. device performance is being extended beyond the limits of conventional structures.
At EPFL, researchers introduced an intrinsic polarization superjunction (iPSJ) transistor built from GaNgallium nitrideGaN is another material platform mentioned for use in different power delivery roles. layers on a low-cost silicon base. The device reportedly withstands nearly 4 kV before breakdown, a level the team describes as a record for this type of technology, while still keeping resistance low. The design uses GaNgallium nitrideGaN is another material platform mentioned for use in different power delivery roles.’s natural polarization to balance positive and electron charge sheets across the structure, preventing charge buildup when the transistor turns off. By shaping the layer thickness accordingly, the voltage spreads more evenly along the device length, and the approach avoids chemical doping.
A second line of work targets p-type GaNgallium nitrideGaN is another material platform mentioned for use in different power delivery roles. contacts. Researchers used an ultrathin magnesium layer on p-GaNgallium nitrideGaN is another material platform mentioned for use in different power delivery roles., followed by a brief anneal at 600°C, to reach a contact resistivity of (1–3) × 10⁻⁴ Ω cm² without surface damage. Thicker magnesium films left the surface too rough, while very thin films oxidized easily in air. In the reported process, the magnesium diffuses quickly into the near-surface region during soft annealing, forming an ultrahigh-concentration doped layer that narrows the depletion region and supports hole tunneling. The method is also described as simpler and cheaper than bottom-up crystal growth, and it can be applied after device processing.
The third result addresses heat removal. MIT, Georgia Tech and Penn State embedded GaNgallium nitrideGaN is another material platform mentioned for use in different power delivery roles. transistors in an ultrathin diamond layer that acts as a heat spreader and evens out the temperature between the GaNgallium nitrideGaN is another material platform mentioned for use in different power delivery roles. and the surrounding silicon. The fabrication flow starts with dielets cut from a GaNgallium nitrideGaN is another material platform mentioned for use in different power delivery roles. wafer, femtosecond-laser drilling of cavities in single-crystal diamond, die attach film placement, and then heat and pressure to form the assembly. Additional dielectric and metal layers are stacked on top.
The diamond-interposer approach was used to build a power amplifier for wireless communications. According to the researchers, the thermal equalization helps preserve reliability while allowing the GaNgallium nitrideGaN is another material platform mentioned for use in different power delivery roles. transistors to approach peak performance. The reported applications include high-power radars, space communications, industrial drones and data-center power conversion.