Prof Donghwan KIM

Prof Donghwan KIM

Department of Material Science and Engineering, Green School, Korean University, South Korea

Light- and electric field-induced degradation of perovskite solar cells

Perovskite solar cells have demonstrated a great potential for the high efficiency but still have to prove the long-term stability. Perovskite cells exhibit degradation upon exposure to moisture, UV light, heat, and electric field. We herein examined the degradation of perovskite solar cells in the presence of UV light alone, excluding the effects of moisture, oxygen, and other part of the solar light spectrum. Perovskite solar cells were exposed to 365 nm UV light for over 1,000 h in argon at <0.5 ppm humidity without encapsulation. The stability of perovskite cells was also observed under various electric bias conditions up to 1.2V. Some of the degraded cells showed a recovery under certain conditions. In this paper, the precise conditions will be presented that cause the degradation and the recovery, and the mechanisms behind the phenomena will also be presented.

Biography

Prof Donghwan Kim,  Department of Material Science and Engineering,  Green School, Korean University, South Korea

Prof. Donghwan Kim received PhD from Stanford University, U.S.A., in 1993, and worked as a postdoc for two years in the Physics Department at Colorado School of Mines. His research topic was thin-film CdTe solar cells with the projects commissioned by NREL. Since 1995, he has been working with Korea University, Seoul, Korea. His recent research interest is on high-efficiency Si solar cells and perovskite tandem cells based on Si.