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Japanese scientists are making “giant” diamond semiconductor discs equivalent to 1 billion Blu-ray discs

Japanese researchers have developed a new method for making diamond wafers that could bring about a breakthrough in quantum storage. The saucer with a diameter of 5 cm consists of extremely pure diamonds. According to the Japanese research team, it can store a huge amount of data equivalent to one billion Blu-ray discs.

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Diamond is one of the most important materials in quantum computing research. A defect in this crystal, also called the “nitro deficiency center,” can be used to store data in the form of superconducting quantum bits. However, if the nitro content in the diamond is too high, the storage capacity decreases.

This prevents scientists from optimizing the breakthrough technology; Either the end product is a diamond semiconductor disk with too much nitrogen, or a pure diamond disk that is too small to be used for data storage purposes.

However, a team from Saga University and Adamant Namiki Precision Jewelry have developed a new method of making semiconductor discs, using diamonds that are of high purity but still large enough for practical use. .

The technology produces a semiconductor disk with a diameter of 5 cm and a capacity equivalent to 1 billion Blu-ray discs. The team used a 25GB capacity Blu-ray disc (single-layer type) as the standard to calculate the capacity of Diamond Semiconductor discs up to 25 exabytes (EB). The Japanese company calls this groundbreaking technology “Kenzan Diamonds”.

The density of nitro in the semiconductor wafer is extremely low at only 3 parts per billion (for every 1 billion mass units of carbon, only 3 parts of it are nitro). This is the largest semiconductor wafer ever made to such a high purity, previous manufacturing efforts resulted in only a clean wafer measuring 2mm in area.2.

Thanks to new production processes, the Japanese research team has a stable product. Typically, the manufacture of a semiconductor wafer from diamond requires that the crystal be “grown” on a flat substrate surface. However, diamonds break easily under pressure, affecting product quality.

To overcome this obstacle, the Japanese team stacked the substrate surface in steps, evenly distributing the pressure and preventing cracks from forming. This enabled the team to produce a large diamond wafer with high purity.

The Japanese company hopes to launch the new product in 2023. They are currently trying to double the diameter of the disc to 10 cm.


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