The 1st QLC seminar (第1回QLCセミナー)

日時 (Date & Time): 2019年7月31日(水)15:30- July 31 (Wed) 15:30-] 場所 (Venue): 新領域基盤棟3階 物質系専攻会議室(3B7)
(room 3B7, Kibanto, Shin-ryoiki, Kashiwa campus)

Role of Organic Molecules in Organic-Inorganic Solar Cell Perovskites

Prof. Seung-Hun Lee (University of Virginia, U.S.A.)

The record solar cell efficiency based on hybrid organic-inorganic perovskites (HOIPs) has reached 22.7% which rivals that of conventional silicon solar cells. Combined with its inexpensive solution based processing and all earth abundant compositions, HOIPs are among the most promising next generation solar cell materials. In this talk, I will present our recent studies, using elastic and inelastic neutron scattering and photoluminescence techniques, and density functional theory calculations, on two HOIPs, methylammonium lead iodide and formamidinium lead iodide, to shed lights on the microscopic mechanism of the photovoltaic properties of the HOIPs.

1. Role of Organic Molecules in Phonon Melting and Charge Screening in Hybrid Organic-Inorganic Perovskites, D. Zhang et al., submitted (2019).
2. Origin of Long Lifetime of Band-Edge Charge Carriers in Organic-Inorganic Lead Iodide Perovskites,
T. Chen et al., Proceedings of National Academy of Sciences 114, 7519-7524 (2017).
3. Entropy Driven Structural Transition and Kinetic Trapping in Formamidinium Lead Iodide Perovskite, T. Chen et al., Science Advances 2, e1601650 (2016).
4. Rotational dynamics of organic cations in CH3NH3PbI3, T. Chen et al., Phys. Chem. Chem. Phys. 17, 31278-31286 (2015).