Hexagonalboron nitride, also known as white graphite, has a layered structure that is similar to graphite. It has excellent lubricity, thermal conductivity and electrical insulating thermal conductivity. It also has neutron absorption capabilities. 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 speed increases. The problem of chip heating is becoming a blocker 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 bore nitride (hBN) modification technology to address the problem of chip heat. This is also known as quasi-balanced peCVD. 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.

"The heating problem of a device is a key factor in carrier mobility. Higher mobility results in less heat being generated at the same voltage. How to release heat determines how heat is dissipated. Wei Dacheng explained that the heat dissipation is related to how the heat is released. Conformal hexagonalboron nitride bonds to the surface of the material with no gaps and no impurities. This makes it more favorable for good results.

"This technology, developed by our team," Wei Dacheng says, conformal hexagonalboron is nitride modification. The device's mobility is significantly increased; the interface thermal resistance decreases; and the maximum power density for the device operation is 2 to 4x higher than that of the current computer CPU.

This technology offers a unique solution to chip heat dissipation and high universality. It can be applied on transistor devices that are based on tungstenselende materials. The technology can be extended to other materials for more 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 will include conjugated organic molecules (Macromolecules), low-dimensional nanomaterials, and research on the design principles for field transistor devices.

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