industry news
Subscribe Now

Gwangju Institute of Science and Technology Makes Breakthrough on New Electronic Material

New research reveals the easy tunability of a perovskite material, opening doors to its widespread use in next generation electronics
Perovskites are semiconducting materials that are a promising alternative to silicon for use in electronics. In a new study, researchers highlight how fabrication of thin films of a particular perovskite in different environments leads to altered electronic properties. This flexibility allows for the development of films with tunable electronic properties, opening doors to a wide variety of next generation electronic devices.
As our lifestyles become ingrained in flexible electronics, smart devices, artificial intelligence, the internet of things, etc., high performance, electronic components that can perform high speed data collection, processing, and execution become a necessity. Certain perovskites are crystal structures that can be promising alternatives to silicon-based components for these next generation electronic applications. Their cubic-like lattice makes them ideal for use as a base for growing oxide films to form heterostructures with unique electrical properties. The properties of these heterostructures depend on the charge transfer in the interfacial layer between the perovskite substrate and oxide overlayer. This charge transfer can be manipulated via either doping or through the fabrication process.
Now, researchers from Korea, led by Prof. Bongjin Simon Mun from Gwangju Institute of Science and Technology, use ambient pressure X-ray photoelectron spectroscopy (AP-XPS) and low energy electron diffraction (LEED) to investigate how fabrication conditions (annealing in an oxygen-rich environment and an oxygen deficit, low-pressure environment) for a particular perovskite material, SrTiO3—one of the most popular substrates for growing oxide films—affects its undoped surface and the resulting interfacial layer of the heterostructure. By using an undoped surface, the researchers wanted to examine the changes that occur on the surface of the substrate without interference from the dopants. “The presence of doping can interfere with correct interpretation of the surface defect states, which can be critical to apprehend the electrical properties of heterostructures. Our study on undoped SrTiO3 provides unbiased characteristics of SrTiO3 substrate,” says Prof. Mun. Their findings were made available online on 16 September 2021 and published in Volume 9 Issue 38 of the Journal of Materials Chemistry C.
In the oxygen environment, an electron depletion layer formed as the Sr atoms in the substrate migrated to the surface of the film to react with oxygen and form a stable oxide layer. In the low-pressure oxygen deficit environment, the formation of such a depletion layer was limited as the oxide layer was formed due to the reduction of the TiO2 layer that generated electrons.
In both environments, a similar oxide layer was formed, but the electronic properties of the structure differed as the electron depletion layer is key to the conductivity of the structure.  “Our work shows clearly how the electrical properties of devices can be tuned by adjusting the population of electrons near the surface region, which is a very fundamental and important result indicating that future electronic devices can be realized with material characterization at the atomic level,” says Prof. Mun. “In the long run, our study on SrTiO3 will lay out a solid foundation for advanced electronic devices that will enable a better lifestyle for us.”
Authors: Hojoon Lim1, Chanyang Song1, Minsik Seo1, Dongwoo Kim1, Moonjung Jung1, Habin Kang1, Seunghwan Kim1, Kyung-Jae Lee1, Youngseok Yu2, Geonhwa Kim3, Ki-Jeong Kim*3, and Bongjin Simon Mun*1
Title of original paper: Nature of the surface space charge layer on undoped SrTiO3 (001)
Journal: Journal of Materials Chemistry C
1. Gwangju Institute of Science and Technology, Republic of Korea
2. Korea Basic Science Institute, Republic of Korea
3. Pohang Accelerator Laboratory, Republic of Korea
About the Gwangju Institute of Science and Technology (GIST) 
The Gwangju Institute of Science and Technology (GIST) is a research-oriented university situated in Gwangju, South Korea. As one of the most prestigious schools in South Korea, it was founded in 1993. The university aims to create a strong research environment to spur advancements in science and technology and to promote collaboration between foreign and domestic research programs. With its motto, “A Proud Creator of Future Science and Technology,” GIST has consistently received one of the highest university rankings in Korea.
About the author
Bongjin Simon Mun is a Professor of Physics and Photon Science at the Gwangju Institute of Science and Technology in Korea. His main research interest is to understand the correlation between surface chemical reactions and electronic structures under various reaction conditions. Mun has been actively involved with the development and application of ambient pressure X-ray photoelectron spectroscopy. Before moving to Korea, Mun worked at Advanced Light Source as a staff scientist. After receiving a Ph.D. in physics from the University of California Davis under the supervision of Prof. Chuck S. Fadley, Mun completed his postdoctoral training at the Phil Ross Group at the Lawrence Berkeley National Laboratory.

Leave a Reply

featured blogs
Nov 24, 2021
The need for automatic mesh generation has never been clearer. The CFD Vision 2030 Study called most applied CFD 'onerous' and cited meshing's inability to generate complex meshes on the first... [[ Click on the title to access the full blog on the Cadence Community site. ]]...
Nov 24, 2021
I just saw an amazing video showing Mick Jagger and the Rolling Stones from 2021 mixed with Spot robot dogs from Boston Dynamics....
Nov 23, 2021
We explain clock domain crossing & common challenges faced during the ASIC design flow as chip designers scale up CDC verification for multi-billion-gate ASICs. The post Integration Challenges for Multi-Billion-Gate ASICs: Part 1 – Clock Domain Crossing appeared f...
Nov 8, 2021
Intel® FPGA Technology Day (IFTD) is a free four-day event that will be hosted virtually across the globe in North America, China, Japan, EMEA, and Asia Pacific from December 6-9, 2021. The theme of IFTD 2021 is 'Accelerating a Smart and Connected World.' This virtual event ...

featured video

Achronix VectorPath Accelerator Card Uses PCIe Gen4 x16 to Communicate with AMD Ryzen PC

Sponsored by Achronix

In this demonstration, the Achronix VectorPath™ accelerator card connects to an AMD Ryzen based PC using PCIe Gen4 x16 interface. The host PC issues commands to have the Speedster™7t FPGA on the VectorPath accelerator card write and read to external GDDR6 memory on the board. These data transactions are performed using the Speedster7t FPGA’s 2D network on chip or NoC which eliminates the need to write complex RTL code to design the host PC to GDDR6 memory interface.

Contact Achronix for a Demonstration of Speedster7t FPGA

featured paper

Add Authentication Security to Automotive Endpoints Using the 1-Wire Interface

Sponsored by Maxim Integrated (now part of Analog Devices)

By adding a single authentication IC, automotive designers can authenticate a component with only one signal between an ECU and endpoint component. This is particularly important as counterfeit and theft are increasingly problems in automotive applications. This application note describes how to implement the DS28E40 Deep Cover 1-Wire Authenticator in a system to provide authentication for optical cameras, headlamps, EV Batteries, occupancy sensors, and even steering wheels, and more.

Click to read more

featured chalk talk

BLDC Applications and Product Solutions

Sponsored by Mouser Electronics and ON Semiconductor

In many ways, Industry 4.0 is encouraging innovation in the arena of brushless motor design. In this episode of Chalk Talk, Amelia Dalton chats with CJ Waters of ON Semiconductor about the components involved in brushless motor design and how new applications like collaborative robots can take advantage of the benefits of BLDCs.

Click here for more information about ON Semiconductor Brushless DC Motor Control Solutions