Low temperature diamond film coating opens up new applications for electronic equipment

**Abstract** Recently, the *Journal of Applied Physics* published a groundbreaking method for growing boron-doped diamond films at low temperatures. This development opens new possibilities for the integration of diamond in next-generation electronic devices. Diamonds are well-known for their exceptional properties, including extreme hardness, optical transparency, surface smoothness, and resistance to chemical corrosion, radiation, and electric fields. These characteristics make them highly valuable in industrial and high-tech applications. In recent years, researchers have been exploring ways to incorporate boron into diamond structures, making them conductive and suitable for use in semiconductors. However, traditional diamond film growth requires high temperatures—often exceeding 800°C—which can damage sensitive components like biosensors, photonic devices, and microelectronics. This limitation has hindered the widespread use of diamond coatings in advanced electronics. A team from Advanced Diamond Technologies in Illinois, USA, has now developed a low-temperature (460–600°C) process for growing boron-doped diamond films. The technique allows these films to be successfully applied to a wide range of electronic devices without compromising their performance. While low-temperature deposition is not a brand-new concept, previous methods failed to produce high-quality, commercially viable diamond films. By adjusting the ratio of methane to hydrogen and reducing the growth temperature, the researchers achieved excellent results. The resulting films maintained good conductivity and surface quality, comparable to those grown at higher temperatures. This breakthrough paves the way for more efficient and cost-effective production of diamond-coated devices. Looking ahead, scientists aim to further refine the process to enable deposition at even lower temperatures—below 400°C. “The lower the temperature, the more electronic devices we can apply this technology to,” said Hongjun Zeng. “This could lead to ultra-thin, smooth, and conductive diamond coatings for future electronics.” The study, published in the *Journal of Applied Physics*, was conducted by Hongjun Zeng, Prabhu U. Arumugam, Shabnam Siddiqui, and John A. Carlisle. It was supported by Advanced Diamond Technologies and Argonne National Laboratory. (Source: *Science Daily*, translated by Wang Xian)

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