CAS Key Lab of Inorganic Functional Materials and Devices
报告题目一：Study on ferroelectric domains by scanning probe microscopy
Prof. Vladimir Shur
Ural Federal University, Ekaterinburg, Russia
The domain engineering represents creation of the stable tailored domain patterns in commercially available ferroelectrics for improvement of the characteristics important for applications. Micro-and nano-domain engineering is the fast-developing area of the ferroelectric science and technology based on the recent achievements in the experimental and theoretical researches. The spatial modulation of the electro-optic and nonlinear-optic characteristics of the ferroelectric crystals by creation of the micron- scale periodical stable tailored domain structure is used successfully for manufacturing of various photonic devices with upgraded performance.
Director of the Ural Center of Shared Use “Modern Nanotechnology”, Ural State University, Ekaterinburg, since March 2009.
Director of the Nanotechnology Department of the Sverdlovsk’s Region Foundation 《Innovative Technology》, since 2007.
Director of the Ural Center of Shared Use “Scanning Probe Microscopy”, Ural State University, Ekaterinburg, since March 2004
Professor of the Chair of Computer Physics, Ural State University, Ekaterinburg, since August 1992.
Head of Ferroelectrics Lab, Institute of Phys. & Applied Mathematics, Ural State University, since December 1981.
报告题目二：Resolving the instability mechanism of hybrid perovskite
The photovoltaic conversion efficiency of halide perovskite solar cells has risen to more than 25% spectacularly in the past a few years, yet the J-V hysteresis of CH3NH3PbI3 remains ambiguous after extensive researches, and its polar nature and ion migration remains hotly debated. Here we present the work that directly correlates ionic migration, ferroelectric polarization, and photocurrent hysteresis at the nanoscale, revealing concurrent evolution of polarization, ions, and photocurrent under light illumination. The work establishes strong photo-induced polarization in triple-cation mixed-halide perovskite, which is found to be not responsible for the photovoltaic hysteresis at both nanoscale and macroscopic scale. This proves that even with the presence of strong spontaneous polarization, the photovoltaic hysteresis is still negligible, supporting the concept that the primary mechanism responsible for photovoltaic hysteresis is ionic migration while polarization is harmless.
赵晋津，女，1982年出生，博士，石家庄铁道大学教授，博士生导师。研究方向：杂化钙钛矿材料及力电光多场耦合研究。2010年博士毕业于中国科学院上海硅酸盐研究所，导师施剑林研究员和陈航榕研究员。2007，2015，2019年分别在德国马普学会胶体与界面研究所，美国华盛顿大学访学研究和香港城市大学访学，在Nature Communications，Advanced Materials等重要期刊上发表论文40 余篇，总引用1200余次；申请国家发明专利28项，已授权国家发明专利14 项；主持国家重点基础研究发展计划（973 计划）前期专项子课题、国家自然科学基金（青年、面上）、河北省自然科学基金杰出青年项目等17 项。参与承办多次国际国内学术研讨会，多次受邀国际国内学术邀请报告。荣获得河北省杰出青年基金、河北省优秀青年基金、河北省青年拔尖人才、河北省 “三三三人才工程”专家、河北省优秀硕士毕业论文指导教师、中国新锐科技人物等称号。