Perovskite Solar Cell

 Nam-Gyu Park

School of Chemical Engineering, Sungkyunkwan University, Suwon 440-746, Korea

 

Abstract: Since the first report on the solid-state perovskite solar cell with power conversion efficiency (PCE) of 9.7% in 2012 by our group, the certified PCE now reaches 22%. It is believed that perovskite solar cell is promising next-generation photovoltaics (PVs) due to superb performance and low cost. In this talk, the history of perovskite photovoltaics will be briefly presented along with scientific progress of perovskite solar cells. Methodologies to achieve hysteresis-free, stable and high PCE perovskite solar cells will be introduced. Lewis acid-base adduct approach has been found to be very reliable and reproducible method to get high quality perovskite layer minimizing non-radiative recombination. Non-stoichiometric precursor in adduct process demonstrated grain boundary healing effect, which further improved voltage and fill factor due to long carrier life time of perovskite and improved charge transporting at grain boundary as well. Grain boundary healing process yields PCE as high as 20.4%. Moisture was effectively protected and hysteresis was significantly reduced by introducing 2-dimensioanl perovskite at grain boundary of 3-dimensional perovskite. Thermal stability of perovskite material was found to be stable up to 120 oC in the absence of moisture, but that of full device was sensitive to selective contacts, indicating that thermally stable selective contacts are equally important. Universal method to remove hysteresis will be also given in this talk. Beyond PV, recent progress in resistive memory, light emitting diode and photodetector based on halide perovskite will be also covered in this talk.


Biography:Nam-Gyu Park is professor and SKKU-Fellow at School of Chemical Engineering, Sungkyunkwan University. He received his B.S., M.S. and Ph.D. from Seoul National University in 1988, 1992 and 1995, respectively. He worked at ICMCB-CNRS, France, from 1996 to 1997 and at National Renewable Energy Laboratory, USA, from 1997 to 1999 as postdoctoral researchers. He worked as Director of Solar Cell Research Center at Korea Institute of Science and Technology (KIST) from 2005 to 2009 and as a principal scientist at Electronics and Telecommunications Research Institute (ETRI) from 2000 to 2005 before joining Sungkyunkwan University as a full professor in 2009. He has been doing researches on high efficiency mesoscopic nanostructured solar cells since 1997. He is pioneer of solid state perovskite solar cell, which was first developed in 2012. He received awards, including Scientist Award of the Month (MEST, Korea), KyungHyang Electricity and Energy Award (KEPCO, Korea), KIST Award of the Year (KIST, Korea), Dupont Science and Technology Award (Dupont Korea), SKKU fellowship, MRS Outstanding Research Award (MRS, Boston), WCPEC Paper Award (Kyoto, Japan), Hamakawa Award of PVSEC (Busan, Korea) and KAST Engineering Award (KAST, Korea). He is a fellow of Korean Academy of Science and Technology (KAST). He published over 230 peer-reviewed scientific papers, including Science, Nature Materials, Nature Nanotechnology, Nature Energy and Nature Communications, 80 patent applications, 1 book editor, 7 book chapters. He received H-index of 70 (Google Scholar) as of August 2017.