报告题目

II-VI based organic-inorganic hybrids: structures, properties, and stability

报 告 人

Yong Zhang，Electrical and Computer Engineering Department, The University of North Carolina at Charlotte

报告地点

物理楼中215

报告时间

2023年6月12号下午3:00

联 系 人

古英(010-62752882)

报告摘要

This talk will introduce a relatively less known family of crystalline, organic-inorganic hybrid materials based on II-VI compounds [1,2], such as ZnTe(C₂N₂H₈)_0.5. On the one hand, they exhibit a number of unusual properties, such as greatly enhanced optical absorption and exciton binding energy compared to the II-VI counterpart [3], favorable band structures for p-type transparent conductive materials [3], zero-thermal expansion [4], peculiar elastic properties [2]. On the other hand, because of the exceptionally high level of crystallinity, they reveal a novel way to obtain defect-free heterostructures with perfect interfaces [5]; and because of their unprecedent long-term stability (over 15 years under ambient conditions), they can uniquely serve as prototype systems to understand the intrinsic and extrinsic degradation mechanisms [5,6]. Comparison with hybrid halide perovskites will be offered.

[1] Huang et al., J. Am. Chem. Soc. 125, 7049 (2003).

[2] Zhang, J. Lumin. 248, 118936 (2022).

[3] Zhang et al., Phys. Rev. Lett.96, 026405 (2006).

[4]Zhang et al., Phys. Rev. Lett. 99, 215901 (2007).

[5] Ye et al., ACS Nano 15, 10565 (2021).

[6]Ye et al., Small (2023).

报告人简介

Dr. Yong Zhang holds the position of Bissell Distinguished Professor in Engineering within the Department of Electrical and Computer Engineering at UNC Charlotte. He obtained his B.S. (1982) and M.S. (1985) degrees in Physics from Xiamen University, followed by his Ph.D. (1994) from Dartmouth College. Afterward, he conducted his postdoctoral research at the National Renewable Energy Laboratory (NREL) and served as a Senior Scientist. In 2009, Dr. Zhang joined UNC Charlotte as a Bissell Distinguished Professor. His research primarily revolves around the electronic and optical properties of semiconductors and related nanostructures, organic-inorganic hybrid materials, electron-phonon coupling, impurities and defects in semiconductors, and novel materials and device architectures for applications in optoelectronics, energy, and electronic-photonic integrated circuits. Dr. Zhang has over 260 publications and holds five patents. He is a Fellow of the American Physical Society.