时间：2023年11月2日（周四）16:00-17:30

Time：4:00-5:30 PM, Thursday, November 2, 2023

地点：西湖大学云谷校区E10-201阶梯教室

Venue: E10-201, Yungu Campus

主持人：西湖大学理学院 徐益明讲席教授邓力

Host: XU Yiming Endowed Chair Professor Li Deng, School of Science

主讲人/Speaker：

Tianquan (Tim)  Lian

William Henry Emerson Professor of Chemistry

Emory University

报告题目/Title:

Exciton Dynamics and Solar H₂ Generation in Quantum Confined Nanoheterostructures

讲座摘要/Abstract:

Quantum confined semiconductor nanocrystals (0D quantum dots, 1D quantum rods and 2D quantum wells) have been intensively investigated as light harvesting and charge separation materials for photovoltaic and photocatalytic applications. The efficiency of these semiconductor nanocrystal-based devices depends on many fundamental processes, including light harvesting, carrier relaxation, exciton localization and transport, charge separation and charge recombination. The competition between these processes determines the overall solar energy conversion (solar to electricity or fuel) efficiency. Quantum confined semiconductor nano-heterostructures, combining two or more material components (such as CdSe/CdS dot-in-rod nanorods or core/crown nanosheets), offer unique opportunities to control their charge separation properties by tailoring their compositions, dimensions and spatial arrangement. Further integration of catalysts (heterogeneous or homogeneous) to these materials forms multifunctional nano-heterostructures, such as CdSe/CdS/Pt, that are shown to be efficient photocatalysts for light driven H₂ generation. Using 0D, 1D and 2D nano- heterostructures as model systems, we directly probe the above-mentioned fundamental exciton and carrier processes by transient absorption and time-resolved fluorescence spectroscopy. We are examining how to control these fundamental processes through the design of heterostructures to achieve long-lived charge separation and efficient H₂ generation. In this talk, we will discuss the mechanism of exciton transport, dissociation, and key factors limiting H₂ generation efficiencies in 1D and 2D nanoheterostructures.

讲座联系人/Contact:

科技合作部Sci-tech02@westlake.edu.cn