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材料学院学术报告---高性能钙钛矿杂化光电子材料
[ 作者:材料学院 来源:哈工大(威海)新闻网 浏览:1072 录入时间:2017年6月28日 ]

应材料学院电子封装系邀请,阿卜杜拉国王科技大学吴韬博士,将于629号访问我校材料科学系并作相关学术报告,欢迎感兴趣的师生参加。

报告时间:2017629日(周四)下午1530

报告地点:石墨楼401

报告题目:高性能钙钛矿杂化光电子

报告摘要:杂化金属卤化物钙钛矿(如CH3NH3PbX3,可以掺杂ClBr或者I)作为下一代高性能光电材料吸引了全球范围内的研究。其杰出的性能如低的制造成本,可控的带隙,高的光吸收率以及长的载流子扩散长度,可在未来造成技术上的范式转变。本报告中,我们将讨论杂化光电子在光伏与光电子器件的透镜中的应用,尤其是光电探测器和光电晶体管。我们在钙钛矿光电晶体管上的研究为钙钛矿薄膜中的平衡电子和空穴迁移的双极传输提供了直接证据。致力于研究这种高流装置,我们发现嵌入碳纳米管的钙钛矿薄膜形成了一维的传输通道,电荷迁移率提高到了普通半导体的水平,如硅晶体。此外二维金属硫化物可用来提高钙钛矿型探测器的性能。最后我们将讨论钙钛矿微晶薄膜应用于光电探测器,并在宽带和窄带条件下均能有效运作。

Abstract

Hybrid organometal halide perovskites, such as CH3NH3PbX3, where X is Cl, Br or I, as next-generation high-performance photovoltaic materials, has aroused lots of interest from the research community. Their exceptional properties, such as low-cost solution processing, tunable direct bandgap, high light absorption and long carrier diffusion length, might lead to paradigm-shifting technologies in the near future [1]. I will discuss the perspective of applying hybrid perovskites in photovoltaic and optoelectronic devices [2], with a focus on photodetectors and phototransistors. Our experiments on perovskite phototransistors provided direct evidence on the ambipolar transport in perovskite films with balanced electron and hole mobilities [3]. As an approach towards high-mobility devices, we found that carbon nanotubes embedded in perovskite films can serve as one-dimensional transport channels and significantly enhance the charge mobility to a level comparable to common semiconductors such as crystalline silicon [4]. Furthermore, two-dimensional metal dichalcogenides were used to boost the performance of perovskite-based photodetectors [5]. Finally, I will discuss the application of perovskite microcrystal films as photodetectors that operate efficiently in both broadband and narrowband regimes [6].

[1] M. I. Saidaminov, et al., Nature Communications, 6, 7586 (2015).

[2] Md Haque, A.D. Sheikh, X. Guan, T. Wu, Advanced Energy Materials (2017).

[3] F. Li, C. Ma, H. Wang, W. Hu, W. Yu, A. D. Sheikh, T. Wu, Nature Communications, 6, 8238 (2015).

[4] F. Li, et al., Advanced Materials, DOI: 10.1002/adma.201602432 (2017).

[5] C. Ma, et al., Advanced Materials 28, 3683 (2016).

[6] M. I. Saidaminov, et al., Advanced Materials DOI: 10.1002/adma.201601235 (2016).

主讲人简介:

吴韬,博士,1995年本科毕业于浙江大学,2002年于美国马里兰大学获博士学位。毕业后工作于芝加哥阿尔贡国家实验室以及南洋理工大学,20132月就职于阿卜杜拉国王科技大学。致力于研究氧化物薄膜、纳米材料以及杂化钙钛矿的电学、磁学以及光学性能,发表了超过200多篇专业论文,课题组培养了14名博士和25名博士后。美国化学协会旗下著名期刊ACS Applied Materials & Interfaces编辑。主页:http://nanooxides.kaust.edu.sa

Brief CV

Dr. Tom Wu (吴韬) received his B.S. degree from Zhejiang University in 1995 and Ph.D. degree from the University of Maryland, College Park in 2002. Before joining King Abdullah University of Science and Technology (KAUST) in Feb. 2013 as Associate Professor, he worked in Argonne National Laboratory in Chicago and Nanyang Technological University (NTU) in Singapore. Dr. Wu has authored more than 200 peer-reviewed papers in the areas of oxide thin films, nanomaterials, and hybrid perovskites, with a focus on their electronic, magnetic and optical functionalities. His group has witnessed the career development of 14 PhD students and 25 postdocs. He also serves as Associate Editor for ACS Applied Materials & Interfaces.

Group website: http://nanooxides.kaust.edu.sa

文章发布员:林日升