A. Fejfar studied physical microelectronics from1981 to 1986 at Faculty of Mathematics and Physics of Charles University in Prague. In 1991 he defended a CSc. (PhD equivalent) thesis about the preparation of organic semiconducting thin films and then he went for a post-doctoral stay to Kyoto University, Japan (1991–93). Since 1994 he works at Institute of Physics of the Academy of Sciences. In 2007–8 he was a visiting professor at the Institute of Chemical Research of Kyoto University.

In his research he specialises in physics of thin films of nanostructured semiconductors for application in solar cells and photonics. He is an author or coauthor of more than 100 publications which have been cited more than 1295 times (h-index = 22) and 1 international patent. He is a member of the Academy Council, Committee on Energy of the Czech Academy of Sciences, scientific board of CEITEC Nano at Brno University of Technology, and IUVSTA Nanometer Structures Division. He is one of the main organisers of the international summer school series on Physics at Nanoscale. He supervised students on undergraduate and graduate levels as well as high school students in the Open Science project. He takes part in popularisation of science, in particular in the field of solar energy and nanosciences.

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