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ShanghaiTech University Prof. Qixi Mi 学术报告
发布日期:2017/12/12

 

报告题目Strong Effects of the A-Site Cation on the Performance and Stability of Perovskite Semiconductors

报告人Prof. Qixi MiShanghaiTech University

时间20171212日上午10:00

地点:徐祖耀楼313

联系人:杨旭东 老师

报告人简介

Prof. Qixi Mi earned his B.S. degree from Peking University in applied chemistry (2003) and his Ph.D. degree from Northwestern University in chemistry (2009). Later he performed postdoctoral research at California Institute of Technology, taking advantage of a fellowship of the NSF Center for Chemical Innovation (CCI Solar). Since joining the School of Physical Science and Technology, ShanghaiTech University in 2013, Prof. Mi’s research projects focus at the physics and chemistry of materials for solar energy conversion, including semiconducting photoelectrode materials, solar water splitting, photoelectrochemistry, as well as time-resolved optical spectroscopy and magnetic resonance.

米启兮教授从北京大学化学学院获得理学学士学位(2003),并毕业于美国西北大学化学系,获得哲学博士学位(2009)。此后他利用美国自然科学基金会奖学金,在加州理工学院太阳能化学创新中心(CCI Solar)进行了博士后研究,并与美国能源部下属的阿贡-西北太阳能研究中心(ANSER)和人工光合作用联合中心(JCAP)开展了紧密合作。201310月加入上海科技大学物质科学与技术学院,任助理教授、研究员。米启兮课题组的研究方向是材料物理化学和清洁能源,主要的研究内容包括:新型半导体光电极材料、太阳能转化利用、光解水产氢、光电化学和时间分辨光谱/磁共振谱学。

摘要:

Semiconducting AMX3 perovskites (X is a halide) have shown remarkable performance in photovoltaics and electroluminescence. The relatively ‘soft’ crystal lattice of AMX3 perovskites entitles these materials such favorable properties as low trap densities and solution processibility, but also a labile crystal structure prone to phase transitions and chemical decomposition. In this talk, we show that fine-tuning the size of the A-site cation can strongly affect the properties of AMX3 perovskite, and propose a volume-based criterion for understanding this structureproperty relationship. For example, two mixed-cation lead triiodides MA0.85EA0.15PbI3 and MA0.89DMA0.11PbI3 exhibit crystal symmetries, charge-carrier diffusion lengths, and moisture stabilities distinctively superior to those of the MAPbI3 benchmark. On the other hand, the all-inorganic CsSnBr3 features favorable band gap, exciton binding energy, and thermally stability over the organic-inorganic hybrid material MASnBr3. Our systematic approach to materials design greatly expands the candidate pool of functional perovskite materials for optoelectronic applications.

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