2020.12.26-29 Invited Lecture  International Conference on Recent Trends in Chemical Sciences (RTCS-2020), Indian Chemical Society, Google Meet. 2020.9.18-23 Invited Lecture  16th International Conference of Computational Methods in Sciences and Engineering(ICCMSE 2020)", video presentation 2020.8.2-3 Invited Lecture  International Seminar "Recent Advances in Chemistry & Material Sciences (2020)", Indian Chemical Society, India, Google Meet 2020.2.20-22 Presentation  the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP20) Tsukuba