Tsinghua University research team makes new progress in high-frequency supercapacitor research
With the rapid development of artificial intelligence and high-performance computing, computing power and power demand are growing exponentially, which poses a dual challenge to the power supply density and efficiency of power management chips. In this context, power management chips are moving towards on-chip integration of passive components to achieve high-density three-dimensional power supply. However, the performance density of traditional silicon-based passive components has approached the physical limit and is difficult to meet the demand.
Dr. Gordon Moore, founder of Intel and the originator of Moore's Law, pointed out (Proceedings of the IEEE, 1998, 82): The lack of large-capacitance capacitors and inductors is the fundamental bottleneck for the development of integrated electronics. Although the micro-electrochemical supercapacitors developed in recent years have shown high capacitance density characteristics, their inherent static characteristics make it difficult to apply to integrated circuits that mainly use AC high-frequency signals.
Recently, Wang Xiaohong's team from the School of Integrated Circuits at Tsinghua University made a breakthrough in the research on the dynamic response limit of high-frequency supercapacitors. This research quantitatively measured the upper limit of the dynamic response frequency of supercapacitors through experiments for the first time.
The research team used micro-nano processing technology to construct an absolutely flat ideal electrode with a pore-free structure, and eliminated interference through methods such as parasitic capacitance shielding layer structure and external phase-locked loop amplification, thereby accurately determining the upper limit of the dynamic response frequency of the supercapacitor for the first time.
On this basis, the team innovatively proposed the concept of "dielectric-electrochemical" asymmetric capacitors - the device is mainly based on electrochemical effects in the low frequency band and dielectric effects in the high frequency band, achieving a double breakthrough in frequency response and capacitance density. The characteristic frequency of the micro-supercapacitor chip prepared based on this concept exceeds 1MHz, which is six orders of magnitude higher than commercial supercapacitors and covers the operating frequency band of mainstream power circuits.
Dr. Gordon Moore, founder of Intel and the originator of Moore's Law, pointed out (Proceedings of the IEEE, 1998, 82): The lack of large-capacitance capacitors and inductors is the fundamental bottleneck for the development of integrated electronics. Although the micro-electrochemical supercapacitors developed in recent years have shown high capacitance density characteristics, their inherent static characteristics make it difficult to apply to integrated circuits that mainly use AC high-frequency signals.
Recently, Wang Xiaohong's team from the School of Integrated Circuits at Tsinghua University made a breakthrough in the research on the dynamic response limit of high-frequency supercapacitors. This research quantitatively measured the upper limit of the dynamic response frequency of supercapacitors through experiments for the first time.
The research team used micro-nano processing technology to construct an absolutely flat ideal electrode with a pore-free structure, and eliminated interference through methods such as parasitic capacitance shielding layer structure and external phase-locked loop amplification, thereby accurately determining the upper limit of the dynamic response frequency of the supercapacitor for the first time.
On this basis, the team innovatively proposed the concept of "dielectric-electrochemical" asymmetric capacitors - the device is mainly based on electrochemical effects in the low frequency band and dielectric effects in the high frequency band, achieving a double breakthrough in frequency response and capacitance density. The characteristic frequency of the micro-supercapacitor chip prepared based on this concept exceeds 1MHz, which is six orders of magnitude higher than commercial supercapacitors and covers the operating frequency band of mainstream power circuits.
