scholarly journals Electron Tunneling from Colloidal CdSe Quantum Dots to ZnO Nanowires Studied by Time-Resolved Luminescence and Photoconductivity Experiments

2015 ◽  
Vol 119 (27) ◽  
pp. 15627-15635 ◽  
Author(s):  
Stephanie Bley ◽  
Michael Diez ◽  
Friederike Albrecht ◽  
Sebastian Resch ◽  
Siegfried R. Waldvogel ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Electron Tunneling ◽  
Zno Nanowires ◽  
Cdse Quantum Dots ◽  
Time Resolved

Piezo and photoelectric coupled nanogenerator using CdSe quantum dots incorporated ZnO nanowires in ITO/ZnO NW/Si structure

2013 ◽  
Vol 138 (1) ◽  
pp. 262-269 ◽  
Author(s):  
A. Kathalingam ◽  
S. Valanarasu ◽  
V. Senthilkumar ◽  
Jin-Koo Rhee
Keyword(s):  
Quantum Dots ◽  
Zno Nanowires ◽  
Cdse Quantum Dots

Optical Properties of Heavily Doped n-type CdSe Quantum Dots for Intersubband Device Applications

2006 ◽  
Vol 959 ◽  
Author(s):  
Shengkun Zhang ◽  
Xuecong Zhou ◽  
Aidong Shen ◽  
Wubao Wang ◽  
Robert Alfano ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Quantum Wells ◽  
Ir Absorption ◽  
Cdse Quantum Dots ◽  
Nonradiative Recombination ◽  
Time Resolved ◽  
Luminescence Efficiency ◽  
Decay Times ◽  
Heavily Doped

ABSTRACTIn this research, interband and intersubband optical properties of heavily doped n-type CdSe quantum dots were investigated by temperature dependent photoluminescence (PL) spectroscopy, picosecond time-resolved PL spectroscopy and Fourier transform infrared (FTIR) spectroscopy. Two doped and one undoped CdSe quantum dot samples with multiple QD layers were grown over ZnCdMgSe barrier layers on InP (001) substrate by molecular beam epitaxy. Heavy doping leads to decreasing of activation energy of nonradiative recombination centers, however, does not affect the luminescence efficiency of doped quantum wells. Time resolved PL experiments show that the PL decay times of the doped samples have weak dependence on well width and are much longer than that of the undoped sample. The two doped CdSe QD samples show strong Intersubband IR absorption that peaked at 2.54 μm, 2.69 μm and 3.51 μm. The ISB absorption is found to be strongly polarization dependent due to the large size of the QDs.

scholarly journals Time-resolved terahertz spectroscopy reveals the influence of charged sensitizing quantum dots on the electron dynamics in ZnO

2017 ◽  
Vol 19 (8) ◽  
pp. 6006-6012 ◽  
Author(s):  
Sesha Bamini N. ◽  
Hynek Němec ◽  
Karel Žídek ◽  
Mohamed Abdellah ◽  
Mohammed J. Al-Marri ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Charge Carrier ◽  
Transient Absorption ◽  
Terahertz Spectroscopy ◽  
Carrier Dynamics ◽  
Transient Absorption Spectroscopy ◽  
Cdse Quantum Dots ◽  
Electron Dynamics ◽  
Time Resolved ◽  
Charge Carrier Dynamics

Photoinitiated charge carrier dynamics in ZnO nanoparticles sensitized by CdSe quantum dots is studied using transient absorption spectroscopy and time-resolved terahertz spectroscopy.

Charge and Energy Transfer Between CdSe Quantum Dots and Polyaniline

2016 ◽  
Vol 16 (4) ◽  
pp. 3909-3913 ◽  
Author(s):  
Liang Xu ◽  
Xingbin Huang ◽  
Wenjiang Dai ◽  
Punan Sun ◽  
Xuanlin Chen ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Energy Transfer ◽  
Fluorescence Spectra ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Cdse Quantum Dots ◽  
Time Resolved Fluorescence ◽  
Cdse Qds ◽  
Time Resolved ◽  
Two Factors

CdSe quantum dots (QDs) and polyaniline (PAni) were mixed to prepare CdSe QDs/PAni complex. PAni can quench the fluorescence of CdSe QDs. Fluorescence intensity of CdSe QDs/PAni complex is related to the size of CdSe QDs and the concentration of PAni. UV-Vis absorption spectra, fluorescence spectra, time-resolved fluorescence spectroscopy were used to analys the quenching phenomenon. The mechanism of fluorescence quenching is dependent on two factors: on one hand, the Förster resonance energy transfer from CdSe to PAni; on the other hand, PAni can intercept the charge relaxation process of CdSe and lead to the interruption of radiative recombination.

Oxygen-Controlled Photoconductivity in ZnO Nanowires Functionalized with Colloidal CdSe Quantum Dots

2012 ◽  
Vol 116 (36) ◽  
pp. 19604-19610 ◽  
Author(s):  
Dongchao Hou ◽  
Apurba Dev ◽  
Kristian Frank ◽  
Andreas Rosenauer ◽  
Tobias Voss
Keyword(s):  
Quantum Dots ◽  
Zno Nanowires ◽  
Cdse Quantum Dots

Growth and time-resolved photoluminescence study of self-organized CdSe quantum dots in ZnSe

1999 ◽  
Vol 25 (1-2) ◽  
pp. 119-125 ◽  
Author(s):  
E. Kurtz ◽  
T. Sekiguchi ◽  
Z. Zhu ◽  
T. Yao ◽  
J.X. Shen ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Cdse Quantum Dots ◽  
Time Resolved ◽  
Photoluminescence Study ◽  
Self Organized ◽  
Time Resolved Photoluminescence

Coherent Raman Spectroscopy and Time-Resolved Emission of CdSe Quantum Dots in Glass

1995 ◽  
Vol 34 (S1) ◽  
pp. 28 ◽  
Author(s):  
Volker Jungnickel ◽  
Fritz Henneberger ◽  
Phillipe Riblet ◽  
Bernd Hönerlage
Keyword(s):  
Quantum Dots ◽  
Raman Spectroscopy ◽  
Cdse Quantum Dots ◽  
Time Resolved ◽  
Coherent Raman

scholarly journals Ultrafast Electron Transfer from CdSe Quantum Dots to a [FeFe]-Hydrogenase Mimic

2021 ◽  
Author(s):  
Alexander Schleusener ◽  
Mathias Micheel ◽  
Stefan Benndorf ◽  
Markus Rettenmayr ◽  
Wolfgang Weigand ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Electron Transfer ◽  
Charge Separation ◽  
Hydrogen Generation ◽  
Cdse Quantum Dots ◽  
Hot Electron ◽  
Time Resolved ◽  
Transfer Processes ◽  
Sacrificial Agent ◽  
Hot Electron Transfer

The combination of CdSe nanoparticles as photosensitizers and [FeFe]-hydrogenase mimics is known to result in efficient systems for light-driven hydrogen generation. Nevertheless, little is known about the details of the light-induced charge-transfer processes. Here we investigate the timescale of light-induced electron transfer between CdSe quantum dots and a simple [FeFe]-hydrogenase mimic adsorbed on the surface of the quantum dot under non-catalytic conditions. Our time-resolved spectroscopic investigation shows that hot electron transfer on a sub-ps timescale and band-edge electron transfer on a sub-10-ps timescale occurs. Fast recombination is observed in the absence of a sacrificial agent or protons, which under real catalytic conditions would quench remaining holes or could stabilize the charge separation. <br>

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