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Advanced neuromorphic semiconducting device Laboratory
The Lee Research Group
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RESEARCH INTERESTS
Realization of brain-inspired synaptic architectures
Neuromorphic computing that emulates the learning and cognitive abilities of human neural networks can define a new era of the futuristic computational architecture due to its extremely efficient energy saving and parallel data processing capability. In biological environment, a synapse, which is a signal transmitter connecting between adjacent neurons, is the heart of neural circuitry to complete the learning and memorization of the human brain. In this sense, the construction of highly effective artificial synapses is the prerequisite to embed the biological plasticity in the digital architecture. Our goal is to deploy many tools available to introduce the biological synaptic behavior into the digital architecture.
Multi-valued logic beyond 0 and 1
The advent of solid-state transistors revolutionized the electronics industry by opening the era of binary devices, where information is represented using two logic states: ON and OFF. However, this binary framework, while efficient in some respects, also definitely imposes limitations, particularly in terms of information density per interconnect. Multi-valued logic (MVL) offers a promising alternative by allowing for more than two logic levels, thereby potentially increasing computational efficiency and reducing power consumption. This approach has garnered increased attention, especially given the constraints posed by the power density limits of conventional complementary metal–oxide–semiconductor (CMOS) technology. Researchers have been exploring various MVL unit devices based on both conventional and emerging materials. These efforts aim to develop devices capable of accommodating multiple logic states while addressing the challenges associated with power consumption and computational efficiency. The goal of Lee group includes the implementation of the various inspiration to the eye-opening technologies to realize the new generation logic circuits.
Fundamentals of plasmonic hot carrier and its applications
Hot carriers are in a highly excited state and out of thermal equilibrium while confined to a metal surface during photon absorption and exothermal chemical reactions. Since carriers with high-kinetic energies of 1−3 eV away from the Fermi energy of the metal relax to phonon scattering within a ten of few femtoseconds, and disappear via energy dissipation into the surrounding materials, it has been difficult to deal with the fast-disappearing charges from the metal surface. However, recent research has proposed that these hot carriers could be applied to effective energy converters in optoelectronic and photocatalytic applications. The focus in our Lab is on investigating the fundamental physics of plasmonic hot carriers as well as realizing futuristic energy harvesting, environment science, and opto-electronic applications.
Developments of compound semiconducting materials and devices
The Lee group also takes a profound interest in exploring compound semiconducting materials and their next generation applications, such as micro light-emitting diodes (LEDs), ultraviolet (UV) LED and power device. Our strategies cover facile and efficient methods to fabricate compound semiconducting materials, such nanocrystal or nanovoid formation. We are also developing a distinctive deposition technique to grow compound semiconducting materials using plasma-enhanced atomic layer deposition (PEALD).