D-DAY

54

July 7(Wed.) ~ 9(Fri.) , 2021

, Korea

Online & Offline Hybrid Symposium

Keynote Speaker

Date & Time

TBA

Place TBA
Speaker

Prof. Hiroshi Amano

Affiliation Nagoya U, Japan
Title Contribution of GaN for establishing Carbon Neutral Society

Contents

The amount of energy saved worldwide through the use of LEDs for general lighting is estimated to be 952.5 TWh/year, which is comparable to the total electricity generation in Japan (1043.6 TWh/year, 2016). Also, nitrides are thought to be semiconducting material systems that can be used in high-power microwave, millimeter-wave and THz devices in next-generation 5G and post-5G wireless communication systems. The energy loss of all-electric power circuits such as inverters and converters can be reduced to one-tenth by replacing Si-based MOSFETs and IGBTs with GaN-based transistors and diodes. In the future, the mobility of humans will be increasingly dependent on vehicles driven by electricity. Electric vehicles (EVs) are one of the most important items for establishing a sustainable society. One of the problems of EVs is their short driving range owing to the insufficient capacity of the battery. Another is their long charging time. We can reduce the electricity consumption of inverters in EVs by 65% by replacing conventional IGBTs with GaN-based high-power HEMTs. In our newly developed EVs, IGBTs will be replaced with GaN-based power devices not only in the inverter but also in all the DC-DC converters. GaN-based systems will also be used in all the displays inside the car, and the headlights will be composed of GaN-based high-brightness LEDs/LDs lamps. Thus, we call such a vehicle, “All GaN vehicle”.
AlGaN-based UV-C LDs may replace conventional solid-state lasers with a fourth-harmonic generation system. In 2019, our group successfully fabricated a 271.8 nm LD on an AlN substrate. To realize current injection lasing, several issues should be overcome. One of the most serious issues is the low hole concentration in the P-type AlGaN cladding layer. From blue LDs to UV LDs, the threshold current density increases drastically with shortening the emission wavelength. We realized efficient hole injection, thus reducing the threshold current density, by using a polarization doping structure. Optimization of the active layer will lead to high-power operation, thus realizing efficient direct diode lasers for future low-carbon-emission laser processing.
We are presently developing an open innovation platform to realize such novel power and opto-electronic devices and systems. We have established the Center for Integrated Research of Future Electronics (CIRFE). The purpose of CIRFE is to gather specialists in different fields such as those in the crystal growth of GaN, AlN, SiC, and carbon nanotubes, device fabrication and characterization, simulation, circuit design, module design, and system applications, thus contributing to realizing a carbon neutral society.

Plenary Speakers

Date & Time

TBA

Place TBA
Speaker

Prof. Nam-Gyu Park

Affiliation Sungkyunkwan University, Korea
Title TBA

Contents

TBA

Date & Time

TBA

Place TBA
Speaker

Prof. Edward H. Sargent

Affiliation University of Toronto, Canada
Title Nano-enabled optoelectronic sensing, solar energy capture, chemicals decarbonization

Contents

Advances in nanomaterials have included the development of colloidal quantum dots, organometal halide perovskites, and nanostructured metal alloys, all with optoelectronic and electrochemical applications in view. I will discuss advances in light sensing (photodetection) based on such materials, and their application in near-infrared image sensors. I will turn to solar photovoltaics, including tandem cells combining crystalline silicon with perovskites. Finally, I will discuss advances in electrochemically reducing CO2 to chemicals such as ethylene and ethylene oxide, and to fuels such as methane and ethanol, all using renewable electricity.

Date & Time

TBA

Place TBA
Speaker

Prof. J. Joshua Yang

Affiliation University of Southern California, USA
Title Memristive Materials and Devices for Neuromorphic Computing

Contents

Memristive devices1 have become a promising candidate for energy-efficient and high-throughput unconventional computing2, which is a key enabler for artificial intelligent systems in the big data and IoT era3. The computing can be implemented on a Resistive Neural Network4 with memristive synapses5 and neurons6,7 or a Capacitive Neural Network8,9 with memcapacitive synapses and neurons. In this talk, I will first briefly introduce the promises and challenges of memristive materials and devices for such applications. I will then discuss a few examples selected from our recent experimental demonstrations of unconventional computing using memristive networks with different levels of bio-inspiration: first, deep learning accelerators10,11 with supervised online learning12; second, neuromorphic computing for pattern classification with unsupervised learning6; last, other computing applications, such as reinforcement learning13 for decision making, artificial nociceptors for robotics14, provable key destruction15 and true random number generators16 for cybersecurity.

Date & Time

TBA

Place TBA
Speaker

Prof. Jens K. Nørskov

Affiliation Technical University of Denmark, Denmark
Title Catalysis for sustainable production of fuels and chemicals

Contents

The development of a sustainable energy system puts renewed focus on catalytic processes for energy conversion. Electricity production from solar and wind is becoming economically competitive but we need to be able to store energy from these intermittent sources. Storage in the form of chemical bonds as fuels is very attractive, but converting electrical into chemical energy efficiently will require completely new catalytic materials. Insight into the way the catalysts work at the molecular level may prove essential to speed up the discovery process. The lecture will outline a theory of nano-particle
catalysis that singles out the most important parameters determining catalytic activity and selectivity. I will use nitrogen reduction to ammonia as the main example and discuss the possibility to find sustainable alternatives to the well known Haber-Bosch process.