supercat
Major
China has 78 data exchange centers. Data is very important for the development of AI.
The future of data:
The future of data:
1200-V GaN-on-Si Quasi-Vertical p-n Diodes
Abstract:
This work reports 1200-V quasi-vertical GaN-on-Si p-n diodes with a 6.6- μm -thick high-quality GaN drift layer showing excellent static and dynamic performance. The as-fabricated GaN-on-Si p-n diode gives a high current on/off ratio of ~1010, a low ideality factor of 1.2, a low specific on-resistance (Ron,sp) of 1.3 mΩ⋅ cm2, and a high breakdown voltage (BV) of 1210 V. The p-n diode can properly operate at a high temperature of 175 °C, and the device performance can be effectively recovered after the power cycling test. A reduced dynamic on-resistance (Ron) dependence on the off-state voltage (VOFF) and on-state conduction time (TON) is observed in this p-n diode and attributed to the filling dynamics of electron traps. A normalized dynamic Ron of 0.7 is realized after switching from a VOFF stress at 1000 V. As the first 1200-V GaN-on-Si vertical power device, this cost-effective p-n diode with high performance holds a great promise for high-voltage power applications.
中科院苏州纳米所孙钱研究团队先后在漂移区的掺杂精准调控、器件关态电子输运机制及高压击穿机制、高性能离子注入保护环的终端开发等核心技术上取得突破,曾经研制出关态耐压达603V、器件的Baliga优值(衡量器件正反向电学性能的综合指标)为0.26GW/cm2的硅衬底GaN纵向肖特基势垒二极管,相关指标为公开报道同类型器件的最佳值(IEEE Electron Device Letters, vol. 42, no. 4, pp. 473-476, Apr 2021; Applied Physics Letters, vol. 118, no. 24, 2021, Art. no. 243501; IEEE Transactions on Electron Devices, vol. 68, no. 11, pp. 5682-5686, 2021)。
在前期工作基础上,近期团队基于6.6 μm厚、穿透位错密度低至9.5 x 107 cm-3的高质量硅基GaN漂移区材料(为公开报道器件中的最低值),成功研制了1200 V的pn功率二极管。器件的理想因子低至1.2;在反向偏置电压为1000 V的条件下,器件在温度为175 oC的工作环境,仍然能正常工作,10次功率循环的测试表明器件具有较佳的可靠性,且受偏置电压和导通时间影响的动态导通电阻降低现象得到了研究,相关工作以1200-V GaN-on-Si Quasi-Vertical p-n Diodes为题发表于微电子器件领域的顶级期刊IEEE Electron Device Letters 43 (12), 2057-2060 (2022),第一作者为中科院苏州纳米所特别研究助理郭小路博士,通讯作者为孙钱研究员和特别研究助理钟耀宗博士。
Telecom industry looks to quantum computing to overcome 5G, 6G bottlenecks
Yes, I already posted this in the last page of this thread. Origin Quantum will be working with China Mobile. They have quite a few projects lined up.
So recently, I saw the news that openHarmony has reached its 3rd anniversary.
Despite many bumps along the way, I think it's fair to say that this is a successful OS so far. The key decision that Huawei made is to allow openHarmony be an OS that supports wide variety to devices, including all the industrial tools. As such, it reached market penetration of 470 million units by August of this year.
With the possible threat that America may ban certain Chinese messaging apps from iPhone and Android stores at some point. It's more imperative than ever for Chinese phone makers and even large soft tech players like Tencent and Alibaba to start producing phones with openHarmony. Can you imagine the disaster if WeChat is banned from android App Store? As far as I can tell, Harmony 3.0 will support Android 12.
As we know, Chinese smart phone companies do have the largest combined market share of any country. I believe it has the largest market share of desktops also. While it maybe too much to get other countries to use KylinOS, it shouldn't be too much for Chinese smart phone/tablet/laptop makers to slowly roll out more and more devices with Harmony OS. Of course, initially just for China and Asian markets. The compatibility with Android apps will be a good selling point. Eventually, smart phone producers like Xiaomi and Oppo can advertise more phone models with Harmony OS.
As I discussed in BRI/Global south thread, China is looking to win the next revolution of industrial 4.0 among others. Taking over the digital infrastructure that people from other countries (especially global south countries) use is the way you win.
these guys are doing some good stuffMore on progress from Origin Quantum since they debuted their commercial quantum computer
so somehow they managed to get quantum computing to work with super computer here. It's one of the areas that Origin Quantum has been in charge of development. It looks like this system allows distributing tasks and collaborating between quantum computer and user computer.
It's quite a good concept. Quantum computer right now is still quite limited. So, you have super computer do tasks that quantum computers just can't do. This seems to be like a good step toward further commercialization of quantum computing.
these guys are doing some good stuff
they are driven by some really young researchers. Over 200 researchers with average age of 27. Over 60% have PHD. Already China's #1 Quantum computing shop and the first to build commercial quantum computing product.
I also saw Bengbu medical center visiting Origin Quantum.
I have a lot of questions about commercialization of Quantum computing. How much of the calculation can be done by quantum computer and how much must be done by super computer. It's fascinating to see medical industry, mobile industries, finance industries, smart manufacturing and biochem also mentioned as fields that can utilize their technology.