Photogenerated excitons in plain core CdSe nanocrystals with unity radiative decay in single channel: the effects of surface and ligands

Journal of the American Chemical Society
Yuan Gao, Xiaogang Peng

Abstract

A systematic and reproducible method was developed to study the decay dynamics of an exciton, a photogenerated electron-hole pair, in semiconductor nanocrystals in solution. Results revealed that the excitons in plain core CdSe nanocrystals in either zinc-blende or wurtzite or mixed lattice structures could be reproducibly prepared to decay radiatively in unity quantum yield and in single channel. The single-channel lifetime was found to increase monotonically by increasing size of the CdSe nanocrystals, with zinc-blende ones increasing in a relatively slow pace. Surface inorganic stoichiometry was found to be a sensitive parameter to affect the exciton decay dynamics for all crystal structures with different sizes. Excess Se (Cd) sites on the surface were found to induce short (long) lifetime channels for the excitons. Both types of traps reduced the quantum yield of the radiative decay of the excitons, and the hole traps associated with Se sites were nearly not emissive. With optimal surface inorganic stoichiometry, primary amines were identified as "ideal" organic ligands for CdSe core nanocrystals to achieve unity radiative decay of excitons in single channel in comparison to other types of neutral ligands commonly applied ...Continue Reading

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Citations

Jun 18, 2016·Journal of the American Chemical Society·Chaodan Pu, Xiaogang Peng
Jul 22, 2016·Journal of the American Chemical Society·Igor Fedin, Dmitri V Talapin
Feb 9, 2017·Journal of the American Chemical Society·Chaodan PuXiaogang Peng
Apr 28, 2017·Journal of the American Chemical Society·Brent A KoscherA Paul Alivisatos
Dec 13, 2016·Chemical Communications : Chem Comm·Yi ShenA B Greytak
Feb 23, 2018·Nanotechnology·Feng LiQinghua Li
Aug 31, 2016·Topics in Current Chemistry·Freddy T Rabouw, Celso de Mello Donega
Oct 9, 2019·The Journal of Chemical Physics·Gryphon A DrakeMoonsub Shim
Jan 12, 2016·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Lakshay JethiPatanjali Kambhampati
Aug 28, 2020·Biotechnology Journal·Saeid KargozarMasoud Mozafari
Nov 3, 2020·Chemical Society Reviews·Xu-Bing LiLi-Zhu Wu
May 19, 2020·Angewandte Chemie·Yufei ShuXiaogang Peng
Nov 21, 2018·Journal of Colloid and Interface Science·Brianna R WatsonTessa R Calhoun
Dec 30, 2020·Chemical Reviews·Cherie R KaganSarah M Thompson
Nov 11, 2020·The Journal of Physical Chemistry Letters·James K UtterbackGordana Dukovic
Apr 22, 2021·The Journal of Physical Chemistry Letters·Zhuoming ZhangMasaru Kuno
Jun 1, 2021·Chemistry of Materials : a Publication of the American Chemical Society·Indy du FosséArjan J Houtepen
Jun 18, 2021·ACS Nano·Amrita DeyLakshminarayana Polavarapu
Jun 2, 2018·The Journal of Physical Chemistry Letters·R Peyton ClineJoel D Eaves
Jul 11, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Satyapriya BhandariArun Chattopadhyay
Jul 30, 2020·ACS Central Science·Zhiyuan CaoXiaogang Peng
Oct 11, 2017·Chemistry of Materials : a Publication of the American Chemical Society·Emily Y TsuiDaniel R Gamelin
Mar 14, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Nannan WeiXingguo Chen
Oct 4, 2017·The Journal of Physical Chemistry Letters·Carlo Giansante, Ivan Infante

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