scholarly journals Room-temperature multiple ligands-tailored SnO2 quantum dots endow in situ dual-interface binding for upscaling efficient perovskite photovoltaics with high VOC

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
Zhiwei Ren ◽  
Kuan Liu ◽  
Hanlin Hu ◽  
Xuyun Guo ◽  
Yajun Gao ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Room Temperature ◽  
Synergistic Effects ◽  
Transparent Electrode ◽  
Interface Control ◽  
Buried Interfaces ◽  
Multiple Ligands ◽  
Physical And Chemical ◽  
Dual Interface

AbstractThe benchmark tin oxide (SnO2) electron transporting layers (ETLs) have enabled remarkable progress in planar perovskite solar cell (PSCs). However, the energy loss is still a challenge due to the lack of “hidden interface” control. We report a novel ligand-tailored ultrafine SnO2 quantum dots (QDs) via a facile rapid room temperature synthesis. Importantly, the ligand-tailored SnO2 QDs ETL with multi-functional terminal groups in situ refines the buried interfaces with both the perovskite and transparent electrode via enhanced interface binding and perovskite passivation. These novel ETLs induce synergistic effects of physical and chemical interfacial modulation and preferred perovskite crystallization-directing, delivering reduced interface defects, suppressed non-radiative recombination and elongated charge carrier lifetime. Power conversion efficiency (PCE) of 23.02% (0.04 cm2) and 21.6% (0.98 cm2, VOC loss: 0.336 V) have been achieved for the blade-coated PSCs (1.54 eV Eg) with our new ETLs, representing a record for SnO2 based blade-coated PSCs. Moreover, a substantially enhanced PCE (VOC) from 20.4% (1.15 V) to 22.8% (1.24 V, 90 mV higher VOC, 0.04 cm2 device) in the blade-coated 1.61 eV PSCs system, via replacing the benchmark commercial colloidal SnO2 with our new ETLs.

scholarly journals Synthesis of Highly Luminescent InP/ZnS Quantum Dots with Suppressed Thermal Quenching

Coatings ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 581
Author(s):  
Linyuan Lian ◽  
Youyou Li ◽  
Daoli Zhang ◽  
Jianbing Zhang
Keyword(s):  
Quantum Dots ◽  
White Light ◽  
Room Temperature ◽  
Thermal Quenching ◽  
Sensitivity Function ◽  
Photoluminescence Quantum Yield ◽  
Phosphorus Source ◽  
Down Conversion ◽  
Inp Quantum Dots

InP quantum dots (QDs) are promising down-conversion phosphors for white light LEDs. However, the mainstream InP QDs synthesis uses expensive phosphorus source. Here, economic, in situ-generated PH3 is used to synthesize InP QDs and a two-step coating of ZnS shells is developed to prepare highly luminescent InP/ZnS/ZnS QDs. The QDs show a photoluminescence quantum yield as high as 78.5%. The emission can be tuned by adjusting the halide precursor and yellow emissive InP/ZnS/ZnS QDs are prepared by judiciously controlling the synthetic conditions. The yellow QDs show suppressed thermal quenching and retain >90% room temperature PL intensity at 150 °C for the growth solution. Additionally, the PL spectrum matches with the eye sensitivity function, resulting in efficient InP QD white light LEDs.

Synthesis and Detection the Thermal Expansion of CdSe Quantum Dots from Room Temperature to 700°C

2015 ◽  
Vol 35 ◽  
pp. 11-20 ◽  
Author(s):  
Zi Yan Zhao ◽  
Ying Zhou ◽  
Feng Gang Bian ◽  
Kun Hao Zhang
Keyword(s):  
Quantum Dots ◽  
Thermal Expansion ◽  
Thermal Properties ◽  
Room Temperature ◽  
Cdse Quantum Dots ◽  
Cdse Qds ◽  
In Situ Xafs

In this paper, we synthesized the CdSe quantum dots (QDs) about 4.5 nm, and using the in-situ XAFS technique to study the thermal expansion of CdSe QDs from room temperature to 700°C. We find that the thermal expansion of the CdSe QDs is about 2.0×10-5/K, which is bigger than the bulk CdSe (3~8×10-6/K). This can demonstrate that the thermal properties of CdSe QDs is related to the size of the dots, which means the thermal expansion is reducing as the size of the nanoparticles increasing. Keywords: CdSe quantum dots, thermal expansion, EXAFS technique

In Situ Simultaneous Chemical Activation and Exfoliation of Carbon Quantum Dots for Atmospheric Adsorption of H2S and CO2 at Room Temperature

2021 ◽  
pp. 149892
Author(s):  
Saeed Fakhraie ◽  
Hamid Reza Rajabi ◽  
Alimorad Rashidi ◽  
Yasin Orooji ◽  
Ebrahim Ghasemy ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Room Temperature ◽  
Chemical Activation ◽  
Carbon Quantum Dots

Ultralow-Threshold and Color-Tunable Continuous-Wave Lasing at Room-Temperature from In Situ Fabricated Perovskite Quantum Dots

2019 ◽  
Vol 10 (12) ◽  
pp. 3248-3253 ◽  
Author(s):  
Lei Wang ◽  
Linghai Meng ◽  
Lan Chen ◽  
Sheng Huang ◽  
Xiangang Wu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Room Temperature ◽  
Continuous Wave ◽  
Color Tunable ◽  
Perovskite Quantum Dots

Growth of GaAs/AlGaAs Quantum Dots Using Self-Organized InP Stressors

1995 ◽  
Vol 417 ◽  
Author(s):  
M. C. Hanna ◽  
Z. H. Lu ◽  
A. F. Cahill ◽  
M. J. Heben ◽  
A. J. Nozik
Keyword(s):  
Quantum Dots ◽  
Room Temperature ◽  
Chemical Vapor ◽  
Growth Conditions ◽  
Organic Chemical ◽  
Near Surface ◽  
Self Organized ◽  
Metal Organic ◽  
Organic Chemical Vapor Deposition

AbstractGaAs quantum dots were formed in a near surface quantum well (QW) by producing lateral confinement with self-organized InP stressors grown in situ by metal organic chemical vapor deposition (MOCVD). We report here the influence of growth conditions on InP island formation on AlGaAs/GaAs single QW structures and also the influence of the QW structure on the optical properties of the GaAs quantum dots. We observe strong photoluminscence up to room temperature from the strain-induced quantum dots with energy redshifts of 70 meV below the QW peak.

Review of the Synthetic Techniques and Applications of the Quantum Dots/Graphene Composites

NANO ◽  
2018 ◽  
Vol 13 (05) ◽  
pp. 1830003 ◽  
Author(s):  
Yong Duan ◽  
Tianjian Zeng ◽  
Tao Sun ◽  
Ling Tong ◽  
Anran Chen ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Synergistic Effects ◽  
Ion Beam ◽  
Direct Synthesis ◽  
Chemical Properties ◽  
Lithium Ion ◽  
Synthetic Methods ◽  
Physical And Chemical Properties ◽  
Physical And Chemical ◽  
And Chemical Properties

The Quantum Dots/Graphene (QDs/GR) composites have attracted numerous interests caused by its unique physical and chemical properties in past few decades. The shortages of the single QD and graphene materials could be remedied by the synergistic effects from QDs/GR composite materials; meanwhile, some unique phenomena and superior physical properties were also produced. The QDs/GR composites processed better photocatalytic activities, higher photon capture abilities and excellent optical responsibilities. Therefore, they were widely applied in various techniques. Here, we reviewed and discussed recent research progresses about the QDs/GR composites and focused on their industrial preparation and commercial applications. Among these synthetic methods, ion beam sputtering deposition (IBSD) and molecular beam epitaxy (MBE) were discussed in detail because they could be directly applied in commercial industry for preparing size-tunable quantum dots. In another part, the applications of the QDs/GR composites were also discussed, the advanced physical and chemical properties promoted these composites to have numerous potential for being applied in photodetectors, lithium ion batteries, solar cells, supercapacitors and other devices. The appropriate synthetic method for QDs/GR materials is highly dependent on the requirements of its applications. We firmly believe that the direct synthesis technique of ideal QDs/GR composite for specific applications is a challenge and research emphasis for scientist and engineers in future.

Otoconia perfect/imperfect crystals

1994 ◽  
Vol 52 ◽  
pp. 42-43
Author(s):  
César D. Fermin ◽  
Dale Martin
Keyword(s):  
Image Processing ◽  
Room Temperature ◽  
Phosphotungstic Acid ◽  
Gallus Domesticus ◽  
Crystal Matrix ◽  
Organic Templates ◽  
Image Processing Algorithms ◽  
Processing Algorithms ◽  
Diffraction Patterns

Otoconia of higher vertebrates are interesting biological crystals that display the diffraction patterns of perfect crystals (e.g., calcite for birds and mammal) when intact, but fail to produce a regular crystallographic pattern when fixed. Image processing of the fixed crystal matrix, which resembles the organic templates of teeth and bone, failed to clarify a paradox of biomineralization described by Mann. Recently, we suggested that inner ear otoconia crystals contain growth plates that run in different directions, and that the arrangement of the plates may contribute to the turning angles seen at the hexagonal faces of the crystals.Using image processing algorithms described earlier, and Fourier Transform function (2FFT) of BioScan Optimas®, we evaluated the patterns in the packing of the otoconia fibrils of newly hatched chicks (Gallus domesticus) inner ears. Animals were fixed in situ by perfusion of 1% phosphotungstic acid (PTA) at room temperature through the left ventricle, after intraperitoneal Nembutal (35mg/Kg) deep anesthesia. Negatives were made with a Hitachi H-7100 TEM at 50K-400K magnifications. The negatives were then placed on a light box, where images were filtered and transferred to a 35 mm camera as described.

In Situ Localization of PPAR Gamma and Uncoupling Protein in Mouse Embryo Sections Using Digoxigenin-Labeled Riboprobes

1996 ◽  
Vol 54 ◽  
pp. 32-33
Author(s):  
C. Jennermann ◽  
S. A. Kliewer ◽  
D. C. Morris
Keyword(s):  
Alkaline Phosphatase ◽  
Room Temperature ◽  
Uncoupling Protein ◽  
Ppar Gamma ◽  
Nuclear Hormone Receptor ◽  
Full Length ◽  
Northern Analysis ◽  
Peroxisome Proliferator

Peroxisome proliferator-activated receptor gamma (PPARg) is a member of the nuclear hormone receptor superfamily and has been shown in vitro to regulate genes involved in lipid metabolism and adipocyte differentiation. By Northern analysis, we and other researchers have shown that expression of this receptor predominates in adipose tissue in adult mice, and appears first in whole-embryo mRNA at 13.5 days postconception. In situ hybridization was used to find out in which developing tissues PPARg is specifically expressed.Digoxigenin-labeled riboprobes were generated using the Genius™ 4 RNA Labeling Kit from Boehringer Mannheim. Full length PPAR gamma, obtained by PCR from mouse liver cDNA, was inserted into pBluescript SK and used as template for the transcription reaction. Probes of average size 200 base pairs were made by partial alkaline hydrolysis of the full length transcripts. The in situ hybridization assays were performed as described previously with some modifications. Frozen sections (10 μm thick) of day 18 mouse embryos were cut, fixed with 4% paraformaldehyde and acetylated with 0.25% acetic anhydride in 1.0M triethanolamine buffer. The sections were incubated for 2 hours at room temperature in pre-hybridization buffer, and were then hybridized with a probe concentration of 200μg per ml at 70° C, overnight in a humidified chamber. Following stringent washes in SSC buffers, the immunological detection steps were performed at room temperature. The alkaline phosphatase labeled, anti-digoxigenin antibody and detection buffers were purchased from Boehringer Mannheim. The sections were treated with a blocking buffer for one hour and incubated with antibody solution at a 1:5000 dilution for 2 hours, both at room temperature. Colored precipitate was formed by exposure to the alkaline phosphatase substrate nitrobluetetrazoliumchloride/ bromo-chloroindlylphosphate.

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