scholarly journals Effects of Oleic Acid on the Stability of Perovskite CsPbBr3 Quantum Dot Dispersions

2019 ◽  
Vol 48 (4) ◽  
pp. 349-352 ◽  
Author(s):  
Takuma Kosugi ◽  
Yoshiki Iso ◽  
Tetsuhiko Isobe
Keyword(s):  
Oleic Acid ◽  
Quantum Dot ◽  
The Stability

The effect of oleic acid on the stability of magnetite ferrofluid

1995 ◽  
Vol 31 (6) ◽  
pp. 4178-4180 ◽  
Author(s):  
M.S. Dababneh ◽  
N.Y. Ayoub
Keyword(s):  
Oleic Acid ◽  
The Stability

scholarly journals Designing an efficient graphene quantum dot-filled luminescent down shifting layer to improve the stability and efficiency of perovskite solar cells by simple optical modeling

RSC Advances ◽  
2018 ◽  
Vol 8 (55) ◽  
pp. 31502-31509 ◽  
Author(s):  
Zahra Hosseini ◽  
Teymoor Ghanbari
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Quantum Dot ◽  
Perovskite Solar Cells ◽  
Perovskite Solar Cell ◽  
Luminescent Material ◽  
Suitable Candidate ◽  
Graphene Quantum Dot ◽  
Optical Modeling ◽  
The Stability

Optical modeling of a GQD-filled LDS layer on top of a perovskite solar cell (PSC) confirms GQDs as a suitable candidate as a luminescent material for application of the LDS strategy in PSCs.

Review on the degradation and device physics of quantum dot solar cells

2015 ◽  
Vol 29 (Supplement 1) ◽  
pp. 1530008 ◽  
Author(s):  
Elham N. Afshar ◽  
Rasoul Rouhi ◽  
Nima E. Gorji
Keyword(s):  
Solar Cells ◽  
Quantum Dot ◽  
Band Gap ◽  
Conversion Efficiency ◽  
High Performance ◽  
Energy Conversion Efficiency ◽  
New Materials ◽  
Quantum Dot Solar Cells ◽  
Photon Conversion ◽  
The Stability

Briefly, we reviewed the latest progress in energy conversion efficiency and degradation rate of the quantum dot (QD) solar cells. QDs are zero dimension nanoparticles with tunable size and accordingly tunable band gap. The maximum performance of the most advanced QD solar cells was reported to be around 10%. Nevertheless, majority of research groups do not investigate the stability of such devices. QDs are cheaper replacements for silicon or other thin film materials with a great potential to significantly increase the photon conversion efficiency via two ways: (i) creating multiple excitons by absorbing a single hot photon, and (ii) formation of intermediate bands (IBs) in the band gap of the background semiconductor that enables the absorption of low energy photons (two-step absorption of sub-band gap photons). Apart from low conversion efficiency, QD solar cells also suffer from instability under real operation and stress conditions. Strain, dislocations and variation in size of the dots (under pressure of the other layers) are the main degradation resources. While some new materials (i.e. perovskites) showed an acceptable high performance, the QD devices are still inefficient with an almost medium rate of 4% (2010) to 10% (2015).

scholarly journals Hydrosilylation of Reactive Quantum Dots and Siloxanes for Stable Quantum Dot Films

Polymers ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 905
Author(s):  
Changmin Lee ◽  
Eunhee Nam ◽  
Woosuk Lee ◽  
Heeyeop Chae
Keyword(s):  
Quantum Dots ◽  
Oleic Acid ◽  
Nucleophilic Addition ◽  
Addition Reaction ◽  
Light Emitting Diode ◽  
Molecular Structures ◽  
One Pot ◽  
Nucleophilic Addition Reaction ◽  
The Stability ◽  
Photo Stability

The reactive acrylate-terminated CdZnSeS/ZnS quantum dots (QDs) were designed and prepared by the effective synthetic route to bond with a siloxane matrix via hydrosilylation. The conventional QD with oleic acid ligands does not have any reactivity, so the QDs were functionalized to assign reactivity for the QDs by the ligand modification of two step reactions. The oleic acid of the QDs was exchanged for hydroxyl-terminated ligands as an intermediate product by one-pot reaction. The hydroxyl-terminated QDs and acrylate-containing isocyanates were combined by nucleophilic addition reaction with forming urethane bonds and terminal acrylate groups. No degradation in quantum yield was observed after ligand exchange, nor following the nucleophilic addition reaction. The modification reactions of ligands were quantitatively controlled and their molecular structures were precisely confirmed by FT-IR and 1H-NMR. The QDs with acrylate ligands were then reacted with hydride-terminated polydimethylsiloxane (H-PDMS) to form a QD-siloxane matrix by thermal curing via hydro-silylation for the first time. The covalent bonding between the QDs and the siloxane matrix led to improvements in the stability against oxygen and moisture. Stability at 85 °C and 85% relative humidity (RH) were both improved by 22% for the QD-connected siloxane QD films compared with the corresponding values for conventional QD-embedded poly(methylmethacrylate) (PMMA) films. The photo-stability of the QD film after 26 h under a blue light-emitting diode (LED) was also improved by 45% in comparison with those of conventional QD-embedded PMMA films.

Biopolymer Encapsulation of CdTe Quantum Dot for In Vitro Controlled Drug Delivery Release of 6-Mercaptopurine

2012 ◽  
Vol 584 ◽  
pp. 258-262 ◽  
Author(s):  
Sundarrajan Parani ◽  
Baddireddi Subhadra Lakshmi ◽  
Kanniyan Pandian
Keyword(s):  
Drug Delivery ◽  
Folic Acid ◽  
Quantum Dot ◽  
Drug Carrier ◽  
Controlled Drug Delivery ◽  
Release Profile ◽  
Drug Release Profile ◽  
The Stability ◽  
Cdte Quantum Dot

Alginate biopolymer stabilized CdTe quantum dot (QD) was prepared and it was encapsulated with folic acid conjugated chitosan for controlled drug delivery of anticancer drug 6-mercaptopurine (6-MP). In addition to alginate, chitosan enhances the stability of QD. Also, in addition to chitosan, alginate binds to the drug leading to enhance the loading efficiency of the resulting drug carrier. The drug release profile of the carrier was investigated by in-vitro. The present study has shown that this drug carrier is feasible for drug delivery and will be important beneficiary for cancer therapy.

Solar Cells of the Inorganic Materials based on PbSe/CdSe Core/Shell Nanocrystals

2015 ◽  
Vol 737 ◽  
pp. 119-122 ◽  
Author(s):  
Tong Yu Wang ◽  
Peng Wang ◽  
He Lin Wang ◽  
Tie Qiang Zhang
Keyword(s):  
Solar Cells ◽  
Quantum Dot ◽  
Conversion Efficiency ◽  
Inorganic Materials ◽  
Photoelectric Conversion Efficiency ◽  
Core Shell ◽  
Cdse Core ◽  
Photoelectric Conversion ◽  
Quantum Dot Solar Cells ◽  
The Stability

This essay employed the "successive ion layer adsorption and reaction (SILAR)"technology to form PbSe/CdSe core/shell.We use the Pbse/CdSe core/shell replaced PbSe nanocrystals and obtained one new quantum dot solar cells of the inorganic.This new solar cells constituted by the metal oxide films retain the photoelectric conversion efficiency of quantum dot solar cells.At the same time,the stability of the new solar cells is tremendously improved with the oxidation resistance of inorganic oxide.Finally,when Jsc=25.2mA/cm2and Voc=0.36V ,we can conclude the conversion efficiency of the solar cell can be evaluated as 3.929%.

Employing Photo-Assisted Ligand Exchange Technique in Layered Quantum Dot LEDs

2011 ◽  
Vol 1286 ◽  
Author(s):  
Wenjia Hu ◽  
Shuai Gao ◽  
Paras N. Prasad ◽  
Jingkang Wang ◽  
Jian Xu
Keyword(s):  
Quantum Dots ◽  
Oleic Acid ◽  
Quantum Dot ◽  
Ligand Exchange ◽  
Light Emitting Diodes ◽  
Light Emitting ◽  
Exchange Technique ◽  
Ligand Replacement

AbstractWe presented in this paper a photo-assisted ligand exchange approach whereby light will be introduced to facilitate the replacement of oleic acid (OA) ligand molecules over PbSe quantum dots (QDs). The ligand-exchanged QDs were used to fabricate quantum dot light-emitting-diodes (QD-LEDs), which outperform the devices comprising the QDs without ligand-replacement.

Experimental study of the stability of harmonic mode-locking in quantum dot passively mode-locked lasers

CLEO: 2014 ◽  
2014 ◽  
Author(s):  
J. K. Mee ◽  
R. Raghunathan ◽  
D. Murrell ◽  
A. Braga ◽  
Y. Li ◽  
...  
Keyword(s):  
Experimental Study ◽  
Quantum Dot ◽  
Mode Locking ◽  
Harmonic Mode ◽  
The Stability ◽  
Mode Locked Lasers
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