关于举行苏黎世联邦理工学院 Maksym V. Kovalenko教授学术报告会的通知

2022-11-02 1295

报告题目1：Highly luminescent lead halide perovskite nanocrystals: revisiting their synthesis and tailoring their surface chemistry

报告时间：2022年11月2日19:00-21:00

报告地点：腾讯会议 269-363-889

会议直播：https://meeting.tencent.com/dm/wnWAppUpl08e

报告题目2：Classical and Quantum Light Applications of Perovskites

报告时间：2022年11月3日19:00-21:00

报告地点：腾讯会议 279-516-325

会议直播：https://meeting.tencent.com/dm/tNkJeDOWUD2a

报告摘要：Colloidal lead halide perovskite (LHP) nanocrystals (NCs), with bright and spectrally narrow photoluminescence (PL) tunable over the entire visible spectral range, are of immense interest as classical and quantum light sources. Severe challenges LHP NCs form by sub-second fast and hence hard-to-control ionic metathesis reactions, which severely limits the access to size-uniform and shape-regular NCs in the sub-10 nm range. We show that a synthesis path comprising an intricate equilibrium between the precursor (TOPO-PbBr₂ complex) and the [PbBr₃^-] solute for the NC nucleation may circumvent this challenge [1]. This results in a scalable, room-temperature synthesis of monodisperse and isolable CsPbBr₃ NCs, size-tunable in the 3-13 nm range. The kinetics of both nucleation and therefrom temporally separated growth are drastically slowed, resulting in total reaction times of up to 30 minutes. The methodology is then extended to FAPbBr₃ (FA = formamidinium) and MAPbBr₃ (MA = methylammonium), allowing for thorough experimental comparison and modeling of their physical properties under intermediate quantum confinement. In particular, NCs of all these compositions exhibit up to four excitonic transitions in their linear absorption spectra, and we demonstrate that the size-dependent confinement energy for all transitions is independent of the A-site cation.

1. M. V. Kovalenko et al. Science 2017, 358, 745-750

2. M. A. Becker et al, Nature 2018, 553, 189-193

3. G. Rainò et al. Nature 2018, 563, 671–675

4. I. Cherniukh et al. Nature 2021, 593, 535–542

5. Q. Akkerman et al. Science, 2022, 377, 1406-1412

报告人简介：Maksym V. Kovalenko为瑞士苏黎世联邦理工学院（(Swiss Federal Institute of Technilogy in Zürich)）教授。他于 2007 年在奥地利林茨约翰内斯开普勒大学获得博士学位。随后在美国芝加哥大学从事博士后研究。2011年，加入苏黎世联邦理工学院和瑞士联邦材料科学与技术实验室任职至今。研究方向包括化学、物理和功能无机材料的应用，包括胶体量子点、新型固态化合物和电化学储能材料。目前的研究集中于功能无机材料：(i) 高效发光的半导体纳米晶的合成； (ii) 纳米晶表面化学； (iii) 通过溶液和固态合成方法探索新型半导体材料； (iv) 用于超短波辐射探测的新型半导体； (iv) 锂离子和后锂离子电池的新材料。迄今为止，先后在包括Nature、 Science、Nature Materials、Nature Photonics、Journal of the American Chemical Society、Advanced Materials等国际重要学术刊物上发表相关研究论文300余篇。他曾获得多项享有盛誉的奖项，包括 Rössler Prize（2019年）ERC Consolidator Grant（2018 年）、ERC Starting Grant（2012 年）、Ruzicka Preis（2013 年）、Werner Prize（2016 年）和 Dan Maydan Prize（2021 年）。此外他目前担任 Chemistry of Materials杂志的副主编。