Time： PM 15:00 June 26, 2014
Location： Conference Room of Basic Energy Sciences Building
Reporter: Prof.Liyuan Han
National Institute for Materials Science, Tsukuba, Ibaraki, Japan.
Abstract
Since the first report in 1991 of the highly efficient dye-sensitized solar cells (DSC), mesoscopic solar cells have been attracting great attention for the high energy conversion efficiency and the low cost of materials and fabrication process. A recent surging example is the perovskite-mesoscopic solar cell (PSC), which had been first studied by applying organolead halide perovskite as quantum-dot sensitizers in DSC and later as a thin-film light absorber and/or charge transport material.
In this presentation, I will introduce our recent achievements in DSCs, including the in-depth understanding of the fundamental working principles, the design of novel organic dyes and co-adsorbent to improve the device performance, and a high-performance platinum-free counter electrode. Our latest research on PSCs will also be presented. Starting from the fundamental understanding of the device equivalent circuit, I will demonstrate the importance of controlling the shunt resistance to improve the device efficiency. Then I will emphasize a universally useful idea for preparing high quality perovskite films to improve the reproducibility of high efficiency. Finally, I will introduce a strategy of using doping-free hole-transport materials to improve the device stability of PSC.
Biography
Dr. Han is a director of photovoltaic materials unit, National Institute for Materials Science. He received a doctor’s degree from the University of Osaka Prefecture in 1988. He worked at SHARP Corporation during 1993 - 2008. He has been investigating dye-sensitized solar cells, especially, improving the conversion efficiency of cells and sub-modules, and developing new sensitized dyes, since 1996. He moved to current position from June 2008. Through his career, he has made great accomplishments in the DSCs, have been efficiency record keeper since 2006, and renewed world record efficiency of 11.4% at 2011. He is inventor in about 150 patents and author in ca 150 scientific publications in the field of dye sensitized solar cells. His current research interests involve foundational research dye-sensitized solar cells, organic solar cells and perovskite solar cells.
Contact: 503 Group/ DNL 16 (84379005)