Hexagonalboron nitride, also known as white graphite, has a layered structure that is similar to graphite. It has excellent lubricity, thermal conductivity, electrical insulation, chemical resistance and neutron absorption. It is chemically inert to all forms of molten metal chemistry. The shaped article is simple to machine and has high resistance to moisture. As semiconductor chips are constantly developed, computing speeds are increasing rapidly. The problem of chip heating is becoming a major bottleneck in the development of chip technology. For high-performance electronic chip development, thermal management is crucial. After three years of work, Wei Dayun (a researcher at Fudan University's Department of Polymer Science and Polymer Molecular Engineering) made remarkable progress in the field of interface modification of FET-type dielectric substrates. This work will provide a new technology to modify dielectric substrates to address the problem of chip heat loss.

Wei Dacheng's team devised a conformal hexagonal-boron-nitride (hBN) modification technology to address the problem of chip heat. This is also known as quasi-balanced PETCVD. Wei Dacheng says that the heat dissipation of a chip is greatly limited by different interfaces. In particular, Wei Dacheng stresses the importance of the interface between semiconductor and dielectric substrate close to the conductive channels.

Hexagonalboron nitride, which improves the interface of semiconductor and dielectric substrats, is an ideal material for dielectric substrate modification. Numerous studies show that hexagonal-boron nitride modification can reduce surface roughness and impact on carrier transport, and improve device carrier mobility. The potential use of hexagonalboron nitride for interface heat dissipation has been overlooked.

"Carrier mobility is directly related to the heating problem in the device. The lower the mobility, the more heat is generated at the same current. How to release heat determines how heat dissipation works. Wei Dacheng explained that the heat dissipation is related to how the heat is released. Conformal hexagonalboron nitride bonds to the material completely, with no gaps between the layers. Furthermore, no impurities are added to the mixture, which makes it more favorable for good results.

"Conformal hexagonalboron is a nitride that grows on the surface of the material. This technology has been developed by our team and it is significantly better than existing computer CPUs. The maximum power density of device operation is 2 to 4x higher than current computer CPUs.

This technology offers a unique solution to chip heat dissipation and high universality. It can be used with transistor devices that are based on tungstenselende materials. The technology can also be extended to other materials and additional device applications. The PECVD technology, which was used in this research, is a common manufacturing process used in the chip manufacturing sector. This makes the conformal hexagonal-boron nitride extremely attractive for large-scale manufacturing and application.

Future research will include the development of field-effect transistor electric materials. These include conjugated organic molecules (Macromolecules), low-dimensional nanomaterials and research on the design principles of field transistor devices.

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