**Meet the editor**

Leonid Kosyachenko is a professor at the National University of Chernivtsi, Ukraine. After receiving his Doctor of Sciences degree in physics and mathematics in 1983, he founded and became the head of the Optoelectronics Department – the first department of this kind at Ukrainian universities. About 20 of his pupils have performed work to obtain the degrees of Candidate (PhD) and Doctor of

Sciences. His research interests have been in physics and technology of solar cells, semiconductor X-ray and γ-ray detectors, and light-emitting and photosensitive devices. He is author (coauthor) of several books and numerous scientific articles and presented reports at international scientific conferences and meetings in Germany, Italy, England, Japan, China, Greece, Spain, Belgium, and Russia. He was the leader of several collaborative projects with the institutions of Russia and Belorussia and is one of the leaders of the long-term projects of the European Commission. Prof. L.A. Kosyachenko is a member of the Ukrainian Physical Society.
