scholarly journals Extension of the diffusion controlled electron transfer theory for intermittent fluorescence of quantum dots: inclusion of biexcitons and the difference of “on” and “off” time distributions

2014 ◽  
Vol 16 (47) ◽  
pp. 25694-25700 ◽  
Author(s):  
Zhaoyan Zhu ◽  
R. A. Marcus
Keyword(s):  
Quantum Dots ◽  
Electron Transfer ◽  
Light Intensity ◽  
Quantum Dot ◽  
Power Law ◽  
Exponential Tail ◽  
Diffusion Controlled ◽  
Electron Transfer Theory ◽  
The Difference ◽  
Off Time

The power law quantum dot blinking, dependence of the exponential tail and the power on light intensity is explained.

scholarly journals Models of semiconductor quantum dots blinking based on spectral diffusion -=SUP=-*-=/SUP=-

2019 ◽  
Vol 126 (1) ◽  
pp. 77
Author(s):  
V.K. Busov ◽  
P.A. Frantsuzov
Keyword(s):  
Quantum Dots ◽  
Electron Transfer ◽  
Quantum Dot ◽  
Semiconductor Quantum Dots ◽  
Spectral Diffusion ◽  
The Other ◽  
Diffusion Controlled ◽  
Colloidal Quantum Dot ◽  
Marcus Model ◽  
Observed Behavior

AbstractThree models of single colloidal quantum dot emission fluctuations (blinking) based on spectral diffusion were considered analytically and numerically. It was shown that the only one of them, namely the Frantsuzov and Marcus model reproduces the key properties of the phenomenon. The other two models, the Diffusion-Controlled Electron Transfer (DCET) model and the Extended DCET model predict that after an initial blinking period, most of the QDs should become permanently bright or permanently dark which is significantly different from the experimentally observed behavior.

scholarly journals Photophysics of Titania Nanoparticle/Quantum Dot Hybrid Structures-=SUP=-*-=/SUP=-

2020 ◽  
Vol 128 (8) ◽  
pp. 1197
Author(s):  
E.P. Kolesova ◽  
F.M. Safin ◽  
V.G. Maslov ◽  
A. Dubavik ◽  
Y.K. Gun'ko ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Electron Transfer ◽  
Quantum Dot ◽  
Electron Donor ◽  
Small Diameter ◽  
Transfer Efficiency ◽  
Titania Nanoparticles ◽  
Hybrid Structures ◽  
Ros Generation ◽  
Cdse Qds

The efficiency of the electron transfer in hybrid structures based on quantum dots of different architectures was studied. Electron transfer efficiency was estimated by two independent methods from the side of the electron donor (quantum dot) and acceptor (Titania nanoparticles). Structures based on core CdSe QDs with small diameter demonstrate the highest efficiency of electron transfer and ROS generation. The presence of the dark fraction of QDs in the ensemble reduces the functionality of hybrid structures and limits their practical applicability.

Silicon Single-Electron Pump and Turnstile: Interplay with Crystalline Imperfections

2005 ◽  
Vol 864 ◽  
Author(s):  
Yukinori Ono ◽  
Akira Fujiwara ◽  
Yasuo Takahashi ◽  
Hiroshi Inokawa
Keyword(s):  
Quantum Dots ◽  
Electron Transfer ◽  
Quantum Dot ◽  
Size Control ◽  
Cmos Technology ◽  
Error Rates ◽  
Research Field ◽  
Localized States ◽  
Single Electron ◽  
Single Electron Transfer

AbstractThe single-electron device (SED), which has quantum dot(s), or island(s) in its core, enables the control of electron motion on the level of an elementary charge. The single-electron pump and turnstile are members of the SED family and enable single-electron transfer synchronized with the gate clock. They have the potential for extremely low error rates of electron transfer and are thus expected to be building-block devices for future information processing and electrical metrology. We have been pursuing the fabrication of Si-based SEDs using CMOS technology with the help of electron-beam lithography and have recently demonstrated a Si single-electron pump and turnstile. They are composed of one Si quantum dot and two tiny MOS gates and have dramatically increased the operation temperatures, which opens up the possibility of the practical use of the pump and turnstile.Another path to realizing single-electron transfer, which we will discuss here, might be to use a localized state in the Si bandgap instead of quantum dots. The localized states could in principle be donor/acceptor levels or any other states created by crystalline imperfections. They are free from the problem of the critical size control of the quantum dots, which might lead to a new era of single-electronics in combination with the rapidly developing research field of “dopant engineering”.

Diffusion-Controlled Synthesis of PbS and PbSe Quantum Dots with in Situ Halide Passivation for Quantum Dot Solar Cells

ACS Nano ◽  
2013 ◽  
Vol 8 (1) ◽  
pp. 614-622 ◽  
Author(s):  
Jianbing Zhang ◽  
Jianbo Gao ◽  
Elisa M. Miller ◽  
Joseph M. Luther ◽  
Matthew C. Beard
Keyword(s):  
Quantum Dots ◽  
Solar Cells ◽  
Quantum Dot ◽  
Controlled Synthesis ◽  
Quantum Dot Solar Cells ◽  
Diffusion Controlled

Interfacial Electron Transfer Involving Vanadium and Graphene Quantum Dots for Redox Flow Battery

MRS Advances ◽  
2018 ◽  
Vol 3 (22) ◽  
pp. 1221-1228
Author(s):  
L. Robarts ◽  
K.S.V. Santhanam
Keyword(s):  
Quantum Dots ◽  
Electron Transfer ◽  
Quantum Dot ◽  
Coulombic Efficiency ◽  
Graphene Quantum Dots ◽  
Cell Voltage ◽  
Energy Storage Devices ◽  
Storage Devices ◽  
Redox Couples ◽  
Vanadium Redox

ABSTRACTAmong energy storage devices, the redox flow batteries are important for variety of applications such as for grid storage. In this class of batteries a large number of redox couples have been examined in the past. The vanadium redox couple, although is attractive for this application, suffers from a) poor charge transfer characteristics b) electrode degradation and c) deteriorating performance. We wish to report here that all these deficiencies have been overcome by using a graphene quantum dot electrodes. This electrode has the advantage of large surface area, high electrical and thermal conductivity. The cell voltage of 1.5 V and power density of about 120 mW/cm2 and coulombic efficiency of 90% can be achieved as the redox couples, V(IV)/V(V) and V(III)/V(II) undergo fast electron transfer at the interface of the quantum dots and solution resulting in higher reversibility. The cyclic voltammetric experiments carried out with quantum dots in the solutions during the oxidation of V(IV) show enhanced currents, due to the movements of the dots which is conducive for power gain in the battery operation. The electrochemical degradation is absent with the quantum dot electrode. The charge/discharge cycles have been reproducible.

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