Giant Photo‐Induced Current Enhancement in a Core–Shell‐Type Quantum‐Dot Thin Film

2020 ◽  
Vol 6 (3) ◽  
pp. 1901069 ◽  
Author(s):  
Sunao Shimizu ◽  
Keiichiro Matsuki ◽  
Kazumoto Miwa ◽  
Daniele Braga ◽  
Shimpei Ono
Keyword(s):  
Thin Film ◽  
Quantum Dot ◽  
Core Shell ◽  
Induced Current ◽  
Shell Type

scholarly journals CdSe/ZnS Core-Shell-Type Quantum Dot Nanoparticles Disrupt the Cellular Homeostasis in Cellular Blood–Brain Barrier Models

2021 ◽  
Vol 22 (3) ◽  
pp. 1068
Author(s):  
Katarzyna Dominika Kania ◽  
Waldemar Wagner ◽  
Łukasz Pułaski
Keyword(s):  
Gene Expression ◽  
Quantum Dot ◽  
Blood Brain Barrier ◽  
Protein Gene ◽  
Brain Barrier ◽  
Core Shell ◽  
Cellular Homeostasis ◽  
Blood Brain ◽  
Shell Type ◽  
The Impact

Two immortalized brain microvascular endothelial cell lines (hCMEC/D3 and RBE4, of human and rat origin, respectively) were applied as an in vitro model of cellular elements of the blood–brain barrier in a nanotoxicological study. We evaluated the impact of CdSe/ZnS core-shell-type quantum dot nanoparticles on cellular homeostasis, using gold nanoparticles as a largely bioorthogonal control. While the investigated nanoparticles had surprisingly negligible acute cytotoxicity in the evaluated models, a multi-faceted study of barrier-related phenotypes and cell condition revealed a complex pattern of homeostasis disruption. Interestingly, some features of the paracellular barrier phenotype (transendothelial electrical resistance, tight junction protein gene expression) were improved by exposure to nanoparticles in a potential hormetic mechanism. However, mitochondrial potential and antioxidant defences largely collapsed under these conditions, paralleled by a strong pro-apoptotic shift in a significant proportion of cells (evidenced by apoptotic protein gene expression, chromosomal DNA fragmentation, and membrane phosphatidylserine exposure). Taken together, our results suggest a reactive oxygen species-mediated cellular mechanism of blood–brain barrier damage by quantum dots, which may be toxicologically significant in the face of increasing human exposure to this type of nanoparticles, both intended (in medical applications) and more often unintended (from consumer goods-derived environmental pollution).

Nonlinear optical properties of core shell type II quantum dot structures

2020 ◽  
Vol 128 ◽  
pp. 106246 ◽  
Author(s):  
Musa Çadirci ◽  
Yasemin Gündoğdu ◽  
Erdem Elibol ◽  
Hamdi Şükür Kılıç
Keyword(s):  
Optical Properties ◽  
Quantum Dot ◽  
Nonlinear Optical ◽  
Nonlinear Optical Properties ◽  
Core Shell ◽  
Type Ii ◽  
Shell Type

scholarly journals Ultra-optical characterization of thin film solar cells materials using core/shell absorber layer

2022 ◽  
Vol 12 (2) ◽  
pp. 1377
Author(s):  
Ahmed Thabet ◽  
Safaa Abdelhady ◽  
Youssef Mobarak
Keyword(s):  
Thin Film ◽  
Solar Cells ◽  
Quantum Dot ◽  
Band Gap ◽  
Energy Band ◽  
Absorber Layer ◽  
Thin Film Solar Cells ◽  
Window Layer ◽  
Core Shell ◽  
Energy Band Gap

<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>

scholarly journals Long Wavelength Plasmonic Absorption Enhancement in Silicon Using Optical Lithography Compatible Core-Shell-Type Nanowires

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Mohammed Shahriar Sabuktagin ◽  
Khairus Syifa Hamdan ◽  
Khaulah Sulaiman ◽  
Rozalina Zakaria ◽  
Harith Ahmad
Keyword(s):  
Thin Film ◽  
Photovoltaic Effect ◽  
Optical Lithography ◽  
Absorption Enhancement ◽  
Core Shell ◽  
Ohmic Loss ◽  
Long Wavelength ◽  
Enhanced Absorption ◽  
Shell Type ◽  
Thin Film Silicon

Plasmonic properties of rectangular core-shell type nanowires embedded in thin film silicon solar cell structure were characterized using FDTD simulations. Plasmon resonance of these nanowires showed tunability from  nm. However this absorption was significantly smaller than the Ohmic loss in the silver shell due to very low near-bandgap absorption properties of silicon. Prospect of improving enhanced absorption in silicon to Ohmic loss ratio by utilizing dual capability of these nanowires in boosting impurity photovoltaic effect and efficient extraction of the photogenerated carriers was discussed. Our results indicate that high volume fabrication capacity of optical lithography techniques can be utilized for plasmonic absorption enhancement in thin film silicon solar cells over the entire long wavelength range of solar radiation.

scholarly journals Fabrication of Hollow Core-Shell Type Si/C Nanocomposites by a Simple Process

2017 ◽  
Vol 15 (0) ◽  
pp. 69-73 ◽  
Author(s):  
Kei Wakabayashi ◽  
Daichi Yamaura ◽  
Kazuki Ito ◽  
Naoya Kameda ◽  
Toshio Ogino
Keyword(s):  
Core Shell ◽  
Hollow Core ◽  
Simple Process ◽  
Shell Type

scholarly journals Flexible and efficient perovskite quantum dot solar cells via hybrid interfacial architecture

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Long Hu ◽  
Qian Zhao ◽  
Shujuan Huang ◽  
Jianghui Zheng ◽  
Xinwei Guan ◽  
...  
Keyword(s):  
Thin Film ◽  
Quantum Dots ◽  
Solar Cells ◽  
Quantum Dot ◽  
High Performance ◽  
Mechanical Stability ◽  
Mechanical Adhesion ◽  
Perovskite Quantum Dots ◽  
Efficient Charge ◽  
Photovoltaic Technologies

AbstractAll-inorganic CsPbI3 perovskite quantum dots have received substantial research interest for photovoltaic applications because of higher efficiency compared to solar cells using other quantum dots materials and the various exciting properties that perovskites have to offer. These quantum dot devices also exhibit good mechanical stability amongst various thin-film photovoltaic technologies. We demonstrate higher mechanical endurance of quantum dot films compared to bulk thin film and highlight the importance of further research on high-performance and flexible optoelectronic devices using nanoscale grains as an advantage. Specifically, we develop a hybrid interfacial architecture consisting of CsPbI3 quantum dot/PCBM heterojunction, enabling an energy cascade for efficient charge transfer and mechanical adhesion. The champion CsPbI3 quantum dot solar cell has an efficiency of 15.1% (stabilized power output of 14.61%), which is among the highest report to date. Building on this strategy, we further demonstrate a highest efficiency of 12.3% in flexible quantum dot photovoltaics.

scholarly journals Reversible Electrochemical Control over Photoexcited Luminescence of Core/Shell CdSe/ZnS Quantum Dot Film

2017 ◽  
Vol 12 (1) ◽  
Author(s):  
Bo Li ◽  
Meilin Lu ◽  
Weilong Liu ◽  
Xiaojun Zhu ◽  
Xing He ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Core Shell ◽  
Electrochemical Control
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