Dr. Kirill Mitrofanov (Staff Scientist)
Email: kirill.mitrofanov at

Dr. Kirill Mitrofanov graduated from Ryazan State Radio Engineering Institute in 2008. In 2012 he defended his thesis on the topic of the chalcogenide semiconductors phase change process. From August 2012 he began to work as a postdoctoral fellow in the Functional Materials Group (currently Systematic Materials Design Group) of the Nanoelectronics Research Institute in the National Institute for Advanced Industrial Science and Technology (AIST) in Tsukuba, Japan. Dr. Mitrofanov carried out multiple studies in x-ray absorption near edge structure and extended x-ray absorption fine structure experimental techniques within experimental proposals at SPring-8 synchrotron (Japan) on such topics as resistivity drift in phase-change memory and atomic and the electronic structure of topological crystalline insulators. Dr. Mitrofanov also studied structural evolution processes in chalcogenide phase-change materials by means of ultrafast time-resolved diffraction using a hard x-ray free electron laser. During his work as a research staff in AIST, Dr. Mitrofanov worked on the fabrication and optimization of phasechange random access memory based on Ge-Sb-Te compounds and interfacial phasechange memory devices based on chalcogenide superlattices utilizing electric and magnetic fields induced switching phenomena. From 2020 he joined the Organic Optoelectronics Unit team in OIST (Okinawa, Japan).
ORCID: 0000-0002-2775-4123

Dr. Zesen Lin (Postdoctoral Researcher)
Email: zesen.lin at

Zesen Lin received his doctor’s degree in organic optoelectronics from Kyushu University in 2020 (supervisor: Prof. Chihaya Adachi). From 2020 he joined the Organic Optoelectronics Unit team in OIST (Okinawa, Japan). His current research interest focuses on the development and mechanism study organic long-persistent materials.
ORCID: 0000-0003-3876-9221


Dr. Sri Lakshmi Venkata Narayana Yemineni (Postdoctoral Researcher)
Email: sri.yemineni at

Dr. S L V Narayana Yemineni was born in 1986 in Andhra Pradesh, India. He was graduated from Andhra University, Vizag, in 2008. He was given the Ph.D. degree for his thesis entitled “Nano/Micro-Scale Macromolecular Materials: Design, Synthesis, Self-Assembly, Lighting and Photonic Applications” in 2016, from the University of Hyderabad, India, under the supervision of Prof. Rajadurai Chandrasekar. From April 2016 he moved to Electronic Functional Macromolecules Group (Dr. Masayoshi Higuchi, Group Leader) in National Institute for Materials Science (NIMS), Tsukuba, Japan as a postdoctoral researcher. His postdoctoral research is focused on the design and synthesis of various metallo-supramolecular polymers (MSPs) for proton, ion conduction, and electrochromic applications. From April 2021 he joined the Organic Optoelectronics Unit team in OIST, Okinawa, Japan. His current research mainly focuses on the design and synthesis of donor-acceptor type dendrimers and copolymers for organic long-persistent materials application.
ORCID: 0000-0001-7024-640X



Rengo Yoshioka
Email: rengo.yoshioka at

Rengo Yoshioka graduated from Tokyo University of Agriculture and Technology (TUAT) in 2020. He was working to investigate photoreaction mechanisms of molecular complexes at the Graduate school of BASE in TUAT. He joined Organic Optoelectronics Unit in March 2021 as a research internship, then became a PhD student from September 2021.




Dmitry Kovalevskiy
Email: dmitry.kovalevskiy at

Dmitry Kovalevskiy was born in Rostov-on-don, a city in the South West of Russia. After completing 9 grades at school, Dmitry moved to the UK with his family and continued his studies at Lancing College in England. After finishing college he went to study Chemical Physics at the University of Bristol in 2017. He graduated with a Master's degree in 2021. Dmitry's Master's project was in the area of solar cells based on bismuth compounds under the supervision of Professor David Fermin. He joined the Organic Optoelectronics Unit in April 2022 as a PhD student for his first lab rotation.




Abhijeet Choudhury
Email: abhijeet.choudhury at

Abhijeet Choudhury received his Master’s degree from the Department of Materials Science and Engineering, National Tsing Hua University, Taiwan in August 2021 and B.Tech degree in Electronics and Communication from the National Institute of Science and Technology, India in April 2019. He previously worked in the Polydimethylsiloxane (PDMS) based capacitive pressure sensors and fabrication of efficient solution-processed OLEDs. He joined Organic Optoelectronics Unit in May 2022 as a research intern.

ORCID ID: 0000-0002-8484-6083





Emiko Asato
Email: easato at

Emiko Asato is from Itoman, a city the southern most of Okinawa Island. After Itoman high school, she lived in Nagasaki, Quanzhou (China), Guangzhou (China), Tokyo, Guam, Okinawa, Gold Coast (Australia) then Okinawa. She has been working as a research unit administrator at OIST for the Neural Computation Unit from 2004 and the Organic Optoelectronics Unit from 2020. Recently, she began to practice Kenjutsu with co-workers after work.

Former members

Hayato Ouchi (2020/04-2022/03 Postdoctoral Researcher)
Qizheng Zhang (2021/05-2022/01 Ph.D. student)
Aleksandr Sorvanov (2020/09-2020/12 Rotation student)