1. Efficient Thermal Management and Heat Spreading Substrates Synthetic diamond possesses the highest room-temperature thermal conductivity in nature (up to 2000-2400 W/m·K), which is several times that of copper, combined with a low dielectric constant and excellent electrical insulation. In microelectronic packaging, it is widely used as heat spreaders and heat sink substrates for high-voltage power transistors, laser diodes, high-brightness LEDs, and radio frequency (RF) power amplifiers. This can significantly reduce the device's junction temperature, improve output power, and extend the equipment's lifespan. Furthermore, in advanced printed circuit board (PCB) designs, diamond can be directly embedded into the PCB. This not only conducts heat from high-density components more efficiently but also shortens routing to reduce parasitic inductance, making board-level design more compact. This is highly suitable for high-density packaging needs in the aerospace and automotive industries. The industry also mixes diamond particles with metal to create copper-diamond or silver-diamond composite materials used as heat sink baseplates for high-power IGBT modules, CPUs, and chipsets. Such composites provide ultra-high thermal conductivity while perfectly matching the coefficient of thermal expansion (CTE) of semiconductor materials like silicon and silicon carbide.

2. Heterogeneous Integration of High-Frequency Microwave Devices (GaN-on-Diamond) In 5G/6G base stations, satellite communications, electronic warfare, and high-power phased-array radars, Gallium Nitride (GaN) high electron mobility transistors (HEMTs) play a core role, but their extremely high power density causes severe localized hotspot issues. Through GaN-on-Diamond heterogeneous integration technology, high-power GaN chips are directly bonded, grown, or embedded as dielets into a diamond substrate, which can greatly eliminate the interface phonon transfer bottleneck. This structure can drastically reduce the channel temperature of the device (e.g., dropping by more than 40°C), thereby allowing the equipment to operate at higher ambient temperatures and achieving a doubled or leapfrog improvement in power-added efficiency and single-pole output power.

3. Next-Generation Wide-Bandgap Power Semiconductor Core Components Diamond is not only an ideal heat dissipation carrier but is also hailed as the "ultimate" ultra-wide bandgap semiconductor material. It has a bandgap of up to 5.47 eV, a critical breakdown electric field far exceeding that of silicon and silicon carbide (10-20 MV/cm), and extremely high carrier mobility. It is directly used to manufacture ultra-high voltage, high-frequency, and high-temperature tolerant semiconductor components:

Transistors and Diodes: Utilizing boron-doped p-type diamond and surface hydrogen-terminated conduction mechanisms to form a two-dimensional hole gas (2DHG), researchers have successfully manufactured diamond Schottky barrier diodes (SBD) capable of withstanding thousands of volts of high voltage, as well as field-effect transistors (such as MOSFETs, MESFETs) that can operate in extreme environments.

Passive RF Devices: High-power resistors and terminations manufactured based on CVD diamond substrates are tiny in volume but can absorb immense thermal energy, providing superior RF performance at frequency bands up to 26.5 GHz or even higher without causing signal distortion.

4.Quantum Computing and Precision Quantum Sensors A special point defect in the synthetic diamond crystal lattice—the nitrogen-vacancy (NV) center—is becoming the core physical platform for quantum information technology due to its extremely long electron spin coherence time at room temperature.

Quantum Computers: NV centers are used to build qubits for room-temperature quantum computers, overcoming the limitation of traditional superconducting quantum computers that require bulky ultra-low temperature liquid helium dilution refrigerators, thus promoting the miniaturization and portability of quantum devices.

High-Precision Sensors: Diamond quantum sensors are extremely sensitive to external perturbations, enabling precise measurements of magnetic fields, electric fields, temperature, and mechanical strains within nanoscale spaces. Currently, they are being explored for applications such as geomagnetic autonomous navigation systems in GPS-denied environments, as well as biomedical monitoring of temperatures inside living cells and brain nerve magnetic fields.

5. Electrochemical and Optical Applications in Harsh Environments

Electrochemical Electrodes: Highly boron-doped diamond (BDD) possesses electrical conductivity, an extremely wide electrochemical working window, chemical inertness, and anti-fouling capabilities. It is widely used as a long-life electrode in water treatment and biological/chemical sensors.

Microwave and High-Power Optical Windows: Diamond has an extremely broad light transmission range from deep ultraviolet to far-infrared and can withstand extreme thermal shocks. Therefore, it is widely used to manufacture protective coatings/lenses for high-power lasers, and transmission windows for megawatt-level high-frequency microwave gyrotrons in nuclear fusion plasma heating devices.