Band Edge Recombination in CdSe, CdS and CdSxSe1−xAlloy Nanocrystals Observed by Ultrafast Fluorescence Upconversion: The Effect of Surface Trap States

2008 ◽  
Vol 112 (33) ◽  
pp. 12736-12746 ◽  
Author(s):  
Maria Danielle Garrett ◽  
Albert D. Dukes III ◽  
James R. McBride ◽  
Nathanael J. Smith ◽  
Stephen J. Pennycook ◽  
...  
Keyword(s):  
Band Edge ◽  
Trap States ◽  
Surface Trap ◽  
Fluorescence Upconversion ◽  
Effect Of Surface

scholarly journals Plasmon-Assisted Suppression of Surface Trap States and Enhanced Band-Edge Emission in a Bare CdTe Quantum Dot

2019 ◽  
Vol 10 (11) ◽  
pp. 2874-2878 ◽  
Author(s):  
Assegid Mengistu Flatae ◽  
Francesco Tantussi ◽  
Gabriele C. Messina ◽  
Francesco De Angelis ◽  
Mario Agio
Keyword(s):  
Quantum Dot ◽  
Band Edge ◽  
Band Edge Emission ◽  
Trap States ◽  
Edge Emission ◽  
Surface Trap ◽  
Cdte Quantum Dot

Effect of Surface Trap States on Photocatalytic Activity of Semiconductor Quantum Dots

2018 ◽  
Vol 122 (17) ◽  
pp. 9312-9319 ◽  
Author(s):  
Haoyang Zou ◽  
Chunwei Dong ◽  
Suyu Li ◽  
Chan Im ◽  
Mingxing Jin ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Photocatalytic Activity ◽  
Semiconductor Quantum Dots ◽  
Trap States ◽  
Surface Trap ◽  
Effect Of Surface

The Enhancement of Band Edge Emission from ZnS/Zn(OH)2 Quantum Dots

2000 ◽  
Vol 642 ◽  
Author(s):  
Hatim Mohamed El-Khair ◽  
Ling Xu ◽  
Xinfan Huang ◽  
Minghai Li ◽  
Xiaofeng Gu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Surface Passivation ◽  
Band Edge ◽  
Band Edge Emission ◽  
Trap States ◽  
Edge Emission ◽  
Surface Trap ◽  
Quantum Size ◽  
Transmission Electron

ABSTRACTWurtzite structure monodisperse ZnS quantum dots (QDs) of 1 to 5 nm diameter, synthesized by colloidal chemical method, were confirmed by transmission electron microscopy (TEM) images and electron diffraction (ED) patterns. Enhanced blue shifted band edge emission from Zn(OH)2 capped ZnS QDs with decreasing size has been observed, which indicates the role of inorganic surface passivation and hence supports the quantum size effect. Detectable far-red shifted emission from bare ZnS QDs has been observed when QDs precursors and stabilizer dispersed in solvents with different polarities. This emission is attributed to the surface trap states of different energies.

Facet-Dependent Surface Trap States and Carrier Lifetimes of Silicon

Nano Letters ◽  
2020 ◽  
Vol 20 (3) ◽  
pp. 1952-1958 ◽  
Author(s):  
Chih-Shan Tan ◽  
Yicheng Zhao ◽  
Rong-Hao Guo ◽  
Wei-Tsung Chuang ◽  
Lih-Juann Chen ◽  
...  
Keyword(s):  
Trap States ◽  
Surface Trap ◽  
Carrier Lifetimes

Increasing the Energy Gap between Band‐Edge and Trap States Slows Down Picosecond Carrier Trapping in Highly Luminescent InP/ZnSe/ZnS Quantum Dots

Small ◽  
2021 ◽  
pp. 2102792
Author(s):  
Young Mo Sung ◽  
Tae‐Gon Kim ◽  
Dong‐Jin Yun ◽  
Mihye Lim ◽  
Dong‐Su Ko ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Energy Gap ◽  
Band Edge ◽  
Trap States ◽  
Carrier Trapping

scholarly journals Energetics of Nonradiative Surface Trap States in Nanoparticles Monitored by Time-of-Flight Photoconduction Measurements on Nanoparticle–Polymer Blends

2019 ◽  
Vol 11 (40) ◽  
pp. 37184-37192
Author(s):  
Xiaoqing Guo ◽  
Qianxun Gong ◽  
Joanna Borowiec ◽  
Sijie Zhang ◽  
Shuo Han ◽  
...  
Keyword(s):  
Polymer Blends ◽  
Time Of Flight ◽  
Trap States ◽  
Surface Trap

Cryogenically probing the surface trap states of single nanowires passivated with self-assembled molecular monolayers

Nanoscale ◽  
2018 ◽  
Vol 10 (1) ◽  
pp. 82-86 ◽  
Author(s):  
Xingyan Zhao ◽  
Peng Tu ◽  
Jiajing He ◽  
Hong Zhu ◽  
Yaping Dan
Keyword(s):  
Trap States ◽  
Surface Trap ◽  
Molecular Monolayers ◽  
Cryogenic Technique ◽  
Single Nanowires ◽  
Self Assembled

We demonstrate a cryogenic technique that is capable of measuring the density of surface trap states in the full half bandgap without the exponential transient photoresponse assumption.

Enhancement of Photoluminescence from Organic and Inorganic Surface Passivated ZnS Quantum Dots

2001 ◽  
Vol 667 ◽  
Author(s):  
Hatim Mohamed El-Khair ◽  
Ling Xu ◽  
Mingha Li ◽  
Yi Ma ◽  
Xinfan Huang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Organic Coating ◽  
Band Edge ◽  
Band Edge Emission ◽  
Trap States ◽  
Edge Enhancement ◽  
Edge Emission ◽  
Inorganic And Organic

ABSTRACTZnS quantum dots (QDs) chemically synthesized in PVP stabilizing medium have been coated with Zn(OH)2, SiO2and polystyrene (PS) shells as inorganic and organic passivation agents. to synthesize ZnS/Zn(OH)2, ZnS/SiO2and ZnS/PS QDs. PL properties of inorganically passivated ZnS/Zn(OH)2 and ZnS/SiO2 had reported band edge enhancement of 8-10 times, while organically passivated ZnS/PS QDs exhibit tremendous enhancement of band edge emission as much as 10-15 times,. Therefore inorganic and organic coating can passivate trap states of different energies on the surface of ZnS QDs.

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