【下午3点】《分子光电科学》系列讲座 | 魏茨曼科学研究院Ayelet Vilan博士

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分子光电科学是研究分子光电材料的分子结构、制备方法与光电器件应用的一门科学，在能源、信息和材料科学等领域发挥至关重要的作用。相关分子材料的设计、制备与合成，结构表征和光电性能测试，机理研究分析，应用探索及产业化技术研究一直都是全球研究与应用机构的关注热点。
天津市分子光电科学重点实验室针对分子光电科学领域前沿热点话题，于5月22日起推出“分子光电科学”系列讲座，搭建一个线上国际科研交流平台，讲座将邀请全球相关领域权威知名专家进行交流研讨，为学术前沿和产业发展建言献策，进一步推动分子光电学科发展。
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主题：Energy Alignment at the Molecule-Electrode Interface: an Electrochemical-Potential/Hardness View

主讲人：Ayelet Vilan

单位：Department of Chemical & Biological Physics, Weizmann Institute of Science, Israel

时间：2020年6月15日 15:00
主办方：天津市分子光电科学重点实验室

报告摘要

Although the importance of energy-alignment at hetero-interface is undeniable, the mechanism dictating it is still debatable. Confusion is even larger for molecular monolayers, because molecules are mostly insulators with no energy-levels in the vicinity of the Fermi-level. This rules out molecular ionization as a means to establish electronic equilibrium. Still, there is a growing evidence for energy alignment between adsorbed molecules and the Fermi-level of their supporting substrate. This can be understood as an equilibrium between the Fermi level of the contact(s) and the chemical potential of the electrons in the molecule, established via polarization of the bound electrons in the immediate vicinity of the interface. The extent of this polarization relates to the notion of ‘chemical hardness’ and is relevant for both chemical binding and physical contact. This concept is demonstrated for several examples of molecular monolayers on Si and on Au.Interface polarization has a key role in energy alignment at any interface, though it is specifically critical for cases where doping is limited, such as organic electronics and 2D materials.

主讲人介绍

Ayelet Vilan received her Ph. D. in the Materials and Interfaces department of the Weizmann Institute of Science, studying dipolar monolayers at the Au/GaAs surface. She did post-doctoral studies at PhilipsResearch (Eindhoven) after which she returned to the Weizmann institute in 2005. In 2013 she was a visiting scientist in Texas A&M. Her major research interest is the development of empirical tools for interpretation and quantification of charge transport across molecular junctions, in either single molecule or monolayer configurations.

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