Prof. Jong Kyu Kim
David Wang Auditorium, 3rd floor Dalia Meidan Bldg.
Three-dimensional nanostructured optical thin-film materials fabricated by electron-beam oblique-angle deposition (OAD) and their photonics and optoelectronics applications are presented. At first, the performance enhancement of polycrystalline Si and III-V multi-junction solar cells by using an optimized discrete multilayer anti-reflection coating with broadband and omni-directional characteristics is presented. Secondly, a strongly enhanced the phosphor conversion efficiency of a white light-emitting diode LED achieved by embedding a dichroic filter acting as an optical filter as well as an ohmic contact. Thirdly, arrays of metal-oxides nano-helixes by electron-beam OAD technique for improving the performance of various solar cells including dye-sensitized solar cells (DSSCs), organic solar cells, and photo-electrochemical cells for water splitting are presented. Cells with nano-helixes arrays show enhanced performances such as higher light absorption and power conversion efficiency than the reference, which are attributed to the larger specific surface area, enhanced light scattering by the nano-helixes array, and fast transport time of photo-injected electrons enabled by the near-single-crystalline metal-oxides nano-helixes. In addition, a number of potential applications including high performance chemical sensors, electronic noses, and circular dichroism discriminator will be discussed.