Widespread adoption of diamond semiconductors is just around the corner.

Diamond is an "ultimate material," boasting the best physical properties of any material—excelling in hardness, sound velocity, thermal conductivity, and Young's modulus. Other remarkable attributes include its ability to transmit light across a broad wavelength spectrum, from ultraviolet to infrared, as well as exceptional thermal and chemical stability, along with controllable electrical resistance and conductivity. These unique characteristics make diamond ideal for a wide range of applications, such as heat sinks, cutting tools, optical components, audio devices, and semiconductors. To date, this material—with its extraordinary performance capabilities—has primarily been utilized for its exceptional hardness and wear resistance. However, with recent advancements in science and technology, its outstanding properties in the semiconductor industry are now being increasingly explored and harnessed for innovative applications.

Applications of diamond in the semiconductor industry

As semiconductor technology continues to advance, the demand for high-performance materials is growing increasingly urgent. Diamond, as a wide-bandgap semiconductor material, uniquely combines exceptional acoustic, optical, electrical, thermal, and mechanical properties—making it a material of significant interest in cutting-edge high-tech fields, particularly in electronics. It is widely regarded as one of the most promising next-generation semiconductor materials. Thanks to these remarkable advantages, wide-bandgap semiconductors like diamond are poised to deliver unparalleled performance and irreplaceable benefits in high-frequency and high-voltage applications. Below are some of the common applications of diamond in the semiconductor industry:

1. High-Power Power Electronic Devices

Diamond, as a semiconductor material, boasts high optical phonon energies as well as the highest electron and hole mobilities. It also exhibits the highest thermal conductivity among known semiconductor materials, making it ideally suited to meet the demands of future high-power, high-electric-field, and radiation-resistant applications. In recent years, diamond-based semiconductors have garnered significant attention for their potential in next-generation, high-frequency, high-power electronic devices. While they already demonstrate impressive performance in power device applications, current research and development efforts remain relatively low, resulting in operational lifespans that are considerably shorter than anticipated—leaving ample room for further improvement.

2. Deep-ultraviolet detector, high-energy particle detector

The bandgap of diamond semiconductor material reaches 5.47 eV, giving it inherent advantages in the deep ultraviolet optoelectronics field. Thanks to diamond's wide bandgap, thermal stability, and radiation resistance, it is ideally suited for applications such as deep UV detectors and high-energy particle detectors operating under extreme conditions.

Diamond detectors boast advantages such as small size, strong radiation resistance, and rapid time response, making them particularly well-suited for applications in the nuclear radiation field. Currently, the key bottleneck hindering the widespread adoption of diamond detectors is the lack of advanced technology for producing high-quality single-crystal diamond materials. Moreover, the detection performance of diamond-based nuclear radiation detectors is significantly affected by impurities and defects within the diamond itself.

3. Substrate Material

With the rapid advancement of electronic technology, semiconductor materials are constantly being updated and upgraded, while integrated circuits continue to evolve toward larger scale, higher integration, and greater power capabilities. According to statistics, over 55% of electronic device failures are caused by overheating. If heat isn’t efficiently dissipated in a timely manner, it can lead to reduced performance or even permanent damage to components due to excessively high local temperatures. Therefore, developing new, highly efficient cooling technologies has become an urgent necessity to ensure the reliability and stability of electronic devices.

Diamond is currently the substrate material with the highest thermal conductivity in nature, making it a promising candidate for achieving near-perfect heat dissipation in "high-heat" devices—and as a result, it has garnered significant attention.

Diamond can also serve as a substrate for GaN power devices, helping to dissipate heat and enabling higher frequencies and greater power output. Over the past decade or so, many developed countries have invested heavily in advancing chemical vapor deposition (CVD) techniques to grow diamond layers on the backside of GaN devices, actively driving the development of diamond-based GaN technologies. However, due to its high cost, the application of GaN devices with diamond substrates has remained largely confined to specialized fields such as defense and aerospace.

How to grow diamonds to meet the demands of the semiconductor industry

Currently, the production of natural diamonds is extremely limited, making it necessary to cultivate diamonds artificially to meet the demands of the semiconductor industry. The primary methods for growing diamonds include the high-pressure high-temperature (HPHT) method and chemical vapor deposition (CVD), among others.

High-pressure, high-temperature–grown diamond single crystals typically contain a certain amount of impurities, which can compromise the purity and grade of the diamonds. Moreover, as semiconductor materials, their doping concentrations are difficult to control, making the synthesis process particularly demanding in terms of technical precision.

The CVD method includes several techniques, such as Hot-Filament Chemical Vapor Deposition (HFCVD), Microwave Plasma Chemical Vapor Deposition (MPCVD), and Direct Current Jet Chemical Vapor Deposition (DCCVD). Among these, MPCVD stands out because it uses electrode-free discharge, generating a pristine plasma that eliminates contamination risks associated with electrodes—commonly found in other growth methods. This makes MPCVD the preferred technique for producing high-quality diamond materials. Currently, recent advancements in CVD synthesis technology have significantly accelerated the development of diamond-based semiconductor technologies, bringing us closer than ever before to the dawn of the diamond semiconductor era.