In a significant stride toward industrial-scale diamond wafer production, researchers have unveiled innovative methods for growing and polishing chemical vapor deposition (CVD) diamond wafers exceeding 10 inches in diameter. This breakthrough, detailed in a recent study published in the journal *Functional Diamond* (translated from Chinese as *功能钻石*), could revolutionize applications in the energy sector, where large, flat-surfaced diamond wafers are increasingly in demand.
Haochen Zhang, lead author of the study and a researcher at the College of Materials Science and Opto-electronic Technology, University of Chinese Academy of Sciences, explains the motivation behind the research: “The need for large-size diamond wafers is analogous to the silicon wafer industry. Our goal was to develop a scalable approach to meet this demand, particularly for industrial applications.”
The study proposes a continuous growing strategy that combines radio frequency induction coupled plasma-enhanced CVD (RFICP CVD) with a repositionable substrate. This method leverages the Van der Drift growth mechanism, which ensures uniform crystal growth across the wafer. “By repositioning the substrate during growth, we can achieve a larger, more uniform diamond wafer,” Zhang notes.
One of the most compelling aspects of this research is the polishing method employed: molten iron erosion polishing (MIEP). This technique offers several advantages, including a high material removal rate, the ability to polish wafers of any size, and the capability to release stress and polish without causing damage. “MIEP is a game-changer for polishing large diamond wafers,” Zhang states. “Its unique characteristics make it an ideal choice for industrial-scale production.”
The implications of this research are far-reaching, particularly for the energy sector. Large, high-quality diamond wafers are crucial for applications such as power electronics, where they can enhance the performance and efficiency of devices. As the demand for renewable energy grows, so too does the need for advanced materials that can support this transition.
The study’s findings lay the groundwork for future developments in the field of diamond wafer production. By providing a scalable and efficient method for growing and polishing large diamond wafers, this research could pave the way for new applications and advancements in various industries.
As the energy sector continues to evolve, the need for innovative materials and technologies will only grow. This research represents a significant step forward in meeting that need, offering a glimpse into the future of diamond wafer production and its potential impact on the energy landscape.