题目：Optical techniques to reveal unique properties of cubic boron arsenide (c-BAs): a promising semiconductor for next generation electronics

报告人：包吉明

邀请人：王大伟

时间：2023年6月29日（周四），下午15：00

地点：紫金港校区西区海纳苑8幢215报告厅 

摘要：Optical techniques have proven to be powerful and versatile tools for the characterization and measurement of fundamental material properties. In this study, we utilize optical techniques to uncover the unique properties of cubic boron arsenide (c-BAs), specifically its exceptional combination of high thermal conductivity and high carrier mobility. Through the development of photoluminescence mapping, we assess the thermal conductivity of c-BAs, followed by the utilization of time-domain thermo-photoluminescence for non-invasive measurements of its high thermal conductivity. Additionally, transient reflectance microscopy allows us to investigate the diffusion behavior of photo-excited electrons and holes, providing valuable insights into the ambipolar carrier mobility of c-BAs. Furthermore, we discuss the application of an idealized Tauc plot method using UV-Vis spectroscopy to accurately determine the bandgap of semiconductors, resulting in a determined bandgap of 1.83 eV for c-BAs. These findings highlight the efficacy of optical techniques in revealing the unique properties of c-BAs and underscore its potential for various applications in next-generation electronics.

References

[1] S. Yue, G.A. Gamage, M. Mohebinia, D. Mayerich, V. Talari, Y. Deng, F. Tian, S.-Y. Dai, H. Sun, V.G. Hadjiev, W. Zhang, G. Feng, J. Hu, D. Liu, Z. Wang, Z. Ren, J. Bao, Materials Today Physics 13, 100194 (2020).

[2] Shuai Yue, Fei Tian, Xinyu Sui, Mohammadjavad Mohebinia, Xianxin Wu, Tian Tong, Zhiming Wang, Bo Wu, Qing Zhang, Zhifeng Ren, Jiming Bao, Xinfeng Liu, Science 377, 433–436 (2022),

[3] Hong Zhong, Fengjiao Pan, Shuai Yuec, Chengzhen Qin, Viktor Hadjiev, Fei Tian, Xinfeng Liu, Feng Lin, Zhiming Wang, Jiming Bao, under review.

个人简介：

Dr. Jiming Bao is Professor of Electrical and Computer Engineering at the University of Houston. He received his B.S. and M.S. in physics from Zhejiang University, his Ph.D. in applied physics from the University of Michigan, and went to Harvard University as a post-doctor. Dr. Bao’s research is focused on developing and characterizing novel materials for energy harvesting and conversions. He has published over 180 articles in high-impact journals, with over 21,000 total citations. He was a Clarivate Analytics' Highly Cited Researcher in 2022. Bao is a Fellow of the American Physical Society and a Fellow of Optica, formerly The Optical Society of America (OSA). 

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