Quantum Dot
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Author(s):  
Ahmed Thabet ◽  
Safaa Abdelhady ◽  
Youssef Mobarak

<span>This paper investigates on new design of heterojunction quantum dot (HJQD) photovoltaics solar cells CdS/PbS that is based on quantum dot metallics PbS core/shell absorber layer and quantum dot window layer. It has been enhanced the performance of traditional HJQD thin film solar cells model based on quantum dot absorber layer and bulk window layer. The new design has been used sub-micro absorber layer thickness to achieve high efficiency with material reduction, low cost, and time. Metallics-semiconductor core/shell absorber layer has been succeeded for improving the optical characteristics such energy band gap and the absorption of absorber layer materials, also enhancing the performance of HJQD ITO/CdS/QDPbS/Au, sub micro thin film solar cells. Finally, it has been formulating the quantum dot (QD) metallic cores concentration effect on the absorption, energy band gap and electron-hole generation rate in absorber layers, external quantum efficiency, energy conversion efficiency, fill factor of the innovative design of HJQD cells.</span>


2022 ◽  
Vol 149 ◽  
pp. 107864
Author(s):  
Suk-Ho Song ◽  
Jae-In Yoo ◽  
Hyo-Bin Kim ◽  
Yong-Sang Kim ◽  
Sang Soo Kim ◽  
...  

2022 ◽  
Vol 26 ◽  
pp. 101358
Author(s):  
Jian Zhang ◽  
Zhiwei Li ◽  
Yaocai Bai ◽  
Yadong Yin

2022 ◽  
Vol 2022 ◽  
pp. 1-6
Author(s):  
Lamessa Gudata ◽  
Jule Leta Tesfaye ◽  
Abela Saka ◽  
R. Shanmugam ◽  
L. Priyanka Dwarampudi ◽  
...  

The exploration of Coulomb blockade oscillations in plasmonic nanoparticle dimers is the subject of this study. When two metal nanoparticles are brought together at the end of their journey, tunnelling current prevents an infinite connection dipolar plasmon and an infinite amplification in the electric fields throughout the hot spot in between nanoparticles from occurring. One way to think about single-electron tunnelling through some kind of quantum dot is to think about Coulomb blockage oscillations in conductance. The electron transport between the dot and source is considered. The model of study is the linear conductance skilled at describing the basic physics of electronic states in the quantum dot. The linear conductance through the dot is defined as G = lim ⟶ 0 I / V in the limit of infinity of small bias voltage. We discuss the classical and quantum metallic Coulomb blockade oscillations. Numerically, the linear conductance was plotted as a function gate voltage. The Coulomb blockade oscillation occurs as gate voltage varies. In the valleys, the conductance falls exponentially as a function gate voltage. As a result of our study, the conductance is constant at high temperature and does not show oscillation in both positive and negative gate voltages. At low temperature, conductance shows oscillation in both positive and negative gate voltages.


Author(s):  
Xue-Hui Shi ◽  
Jing-Ping Yuan ◽  
Ying-Ying Dai ◽  
Xing Liu ◽  
Shu-Lin Liu ◽  
...  

2022 ◽  
Vol 105 (4) ◽  
Author(s):  
Dan Cogan ◽  
Zu-En Su ◽  
Oded Kenneth ◽  
David Gershoni

2022 ◽  
Author(s):  
Osman Cifci ◽  
Mikayla Yoder ◽  
Lu Xu ◽  
Hao Chen ◽  
Christopher Beck ◽  
...  

Abstract A key display characteristic is its efficiency (emitted light power divided by input power). While display efficiencies are being improved through emissive (e.g., quantum dot and organic light emitting display (OLED) designs1,2, which remove the highly inefficient color filters found in traditional liquid crystal displays (LCDs)3,4, polarization filters, which block about 50% of the light, remain required to inhibit ambient light reflection. We introduce a luminescent cavity design to replace both the color and polarization filters. Narrow-band, large Stokes shift, CdSe/CdS quantum dot emitters are embedded in a reflective cavity pixel element with a small top aperture. The remainder of the top surface is coated black reducing ambient light reflection. A single pixel demonstrates an extraction efficiency of 40.9% from a cavity with an 11% aperture opening. A simple proof-of-concept multi-pixel array is demonstrated.


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