Nanotechnology Now

Our NanoNews Digest Sponsors
Heifer International



Home > Press > Improving quantum dot interactions, one layer at a time: Scientists have found a way to control an interaction between quantum dots that could lead to more efficient solar cells

Low quantum dot concentrations during superlattice fabrication suppresses quantum resonance between dots in the same layer, while high concentrations activates it

CREDIT
DaeGwi Kim, Osaka City University
Low quantum dot concentrations during superlattice fabrication suppresses quantum resonance between dots in the same layer, while high concentrations activates it CREDIT DaeGwi Kim, Osaka City University

Abstract:
Osaka City University scientists and colleagues in Japan have found a way to control an interaction between quantum dots that could greatly improve charge transport, leading to more efficient solar cells. Their findings were published in the journal Nature Communications.

Improving quantum dot interactions, one layer at a time: Scientists have found a way to control an interaction between quantum dots that could lead to more efficient solar cells

Osaka, Japan | Posted on November 20th, 2020

Nanomaterials engineer DaeGwi Kim led a team of scientists at Osaka City University, RIKEN Center for Emergent Matter Science and Kyoto University to investigate ways to control a property called quantum resonance in layered structures of quantum dots called superlattices.

"Our simple method for fine-tuning quantum resonance is an important contribution to both optical materials and nanoscale material processing," says Kim.

Quantum dots are nanometer-sized semiconductor particles with interesting optical and electronic properties. When light is shone on them, for example, they emit strong light at room temperature, a property called photoluminescence. When quantum dots are close enough to each other, their electronic states are coupled, a phenomenon called quantum resonance. This greatly improves their ability to transport electrons between them. Scientists have been wanting to manufacture devices using this interaction, including solar cells, display technologies, and thermoelectric devices.

However, they have so far found it difficult to control the distances between quantum dots in 1D, 2D and 3D structures. Current fabrication processes use long ligands to hold quantum dots together, which hinders their interactions.

Kim and his colleagues found they could detect and control quantum resonance by using cadmium telluride quantum dots connected with short N-acetyl-L-cysteine ligands. They controlled the distance between quantum dot layers by placing a spacer layer between them made of oppositely charged polyelectrolytes. Quantum resonance is detected between stacked dots when the spacer layer is thinner than two nanometers. The scientists also controlled the distance between quantum dots in a single layer, and thus quantum resonance, by changing the concentration of quantum dots used in the layering process.

The team next plans to study the optical properties, especially photoluminescence, of quantum dot superlattices made using their layer-by-layer approach. "This is extremely important for realizing new optical electronic devices made with quantum dot superlattices," says Kim.

Kim adds that their fabrication method can be used with other types of water-soluble quantum dots and nanoparticles. "Combining different types of semiconductor quantum dots, or combining semiconductor quantum dots with other nanoparticles, will expand the possibilities of new material design," says Kim.

####

About Osaka City University
We are Osaka City University - the oldest research university in Osaka. With 9 undergraduate faculties and 11 graduate schools all dedicated to making urban life better, energy cleaner, and people healthier and happier, we have won numerous awards and have produced 2 Nobel laureates. For more information, please visit our website at https://www.osaka-cu.ac.jp/en

For more information, please click here

Contacts:
James Gracey

81-666-053-592

@OCU_PR

Copyright © Osaka City University

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related Links

RELATED JOURNAL ARTICLE:

Related News Press

News and information

CEA-Leti Reports Machine-Learning Breakthrough That Opens Way to Edge Learning: Article in Nature Electronics Details Method that Takes Advantage of RRAM Non-Idealities To Create Intelligent Systems that Have Potential Medical-Diagnostic Applications January 20th, 2021

Arrowhead Pharmaceuticals to Webcast Fiscal 2021 First Quarter Results January 20th, 2021

Scientists synthetize new material for high-performance supercapacitors January 19th, 2021

Keeping the costs of superconducting magnets down using ultrasound: Scientists show ultrasonication is a cost-effective approach to enhance the properties of magnesium diboride superconductors January 15th, 2021

Display technology/LEDs/SS Lighting/OLEDs

Aledia, French Developer of Next-Generation MicroLED Displays For High-Volume Consumer Markets, Announces it Has Produced its First Nanowire Chips on 300mm Silicon Wafers Using CEA-Leti Pilot Lines: Company will produce microLEDs on both 200mm and 300mm silicon wafers December 15th, 2020

An LED that can be integrated directly into computer chips: The advance could cut production costs and reduce the size of microelectronics for sensing and communication December 14th, 2020

Breakthrough quantum-dot transistors create a flexible alternative to conventional electronics: Quantum dot logic circuits provide the long-sought building blocks for innovative devices, including printable electronics, flexible displays, and medical diagnostics October 30th, 2020

Veeco Announces Aledia Order of 300mm MOCVD Equipment for microLED Displays: Propel™ Platform First 300mm System with EFEM Designed for Advanced Display Applications October 20th, 2020

Possible Futures

CEA-Leti Reports Machine-Learning Breakthrough That Opens Way to Edge Learning: Article in Nature Electronics Details Method that Takes Advantage of RRAM Non-Idealities To Create Intelligent Systems that Have Potential Medical-Diagnostic Applications January 20th, 2021

Arrowhead Pharmaceuticals to Webcast Fiscal 2021 First Quarter Results January 20th, 2021

Scientists synthetize new material for high-performance supercapacitors January 19th, 2021

Keeping the costs of superconducting magnets down using ultrasound: Scientists show ultrasonication is a cost-effective approach to enhance the properties of magnesium diboride superconductors January 15th, 2021

Discoveries

CEA-Leti Reports Machine-Learning Breakthrough That Opens Way to Edge Learning: Article in Nature Electronics Details Method that Takes Advantage of RRAM Non-Idealities To Create Intelligent Systems that Have Potential Medical-Diagnostic Applications January 20th, 2021

Scientists synthetize new material for high-performance supercapacitors January 19th, 2021

Scientists' discovery is paving the way for novel ultrafast quantum computers January 15th, 2021

Physicists propose a new theory to explain one dimensional quantum liquids formation January 15th, 2021

Announcements

CEA-Leti Reports Machine-Learning Breakthrough That Opens Way to Edge Learning: Article in Nature Electronics Details Method that Takes Advantage of RRAM Non-Idealities To Create Intelligent Systems that Have Potential Medical-Diagnostic Applications January 20th, 2021

Arrowhead Pharmaceuticals to Webcast Fiscal 2021 First Quarter Results January 20th, 2021

Scientists synthetize new material for high-performance supercapacitors January 19th, 2021

Keeping the costs of superconducting magnets down using ultrasound: Scientists show ultrasonication is a cost-effective approach to enhance the properties of magnesium diboride superconductors January 15th, 2021

Interviews/Book Reviews/Essays/Reports/Podcasts/Journals/White papers/Posters

Scientists synthetize new material for high-performance supercapacitors January 19th, 2021

Conductive nature in crystal structures revealed at magnification of 10 million times: University of Minnesota study opens up possibilities for new transparent materials that conduct electricity January 15th, 2021

Quantum computers to study the functioning of the molecules of life: A team of theoretical physicists from the University of Trento has shown that it is possible to use quantum computers to simulate processes of great biological importance, such as changes in the shape of protein January 15th, 2021

Keeping the costs of superconducting magnets down using ultrasound: Scientists show ultrasonication is a cost-effective approach to enhance the properties of magnesium diboride superconductors January 15th, 2021

Energy

USTC develops ultrahigh-performance plasmonic metal-oxide materials January 11th, 2021

Controlling the nanoscale structure of membranes is key for clean water, researchers find January 1st, 2021

Bionic idea boosts lithium-ion extraction January 1st, 2021

Record-setting thermoelectric figure of merit achieved for metal oxides December 29th, 2020

Battery Technology/Capacitors/Generators/Piezoelectrics/Thermoelectrics/Energy storage

Scientists synthetize new material for high-performance supercapacitors January 19th, 2021

Record-setting thermoelectric figure of merit achieved for metal oxides December 29th, 2020

New imaging method views soil carbon at near-atomic scales December 25th, 2020

New class of cobalt-free cathodes could enhance energy density of next-gen lithium-ion batteries December 21st, 2020

Quantum Dots/Rods

Theory describes quantum phenomenon in nanomaterials: Osaka City University scientists have developed mathematical formulas to describe the current and fluctuations of strongly correlated electrons in quantum dots. Their theoretical predictions could soon be tested experimentally December 25th, 2020

Breakthrough quantum-dot transistors create a flexible alternative to conventional electronics: Quantum dot logic circuits provide the long-sought building blocks for innovative devices, including printable electronics, flexible displays, and medical diagnostics October 30th, 2020

A quantum material-based diagnostic paint to sense problems before structural failure October 23rd, 2020

Turning a hot spot into a cold spot: Fano-shaped local-field responses probed by a quantum dot October 9th, 2020

Solar/Photovoltaic

USTC develops ultrahigh-performance plasmonic metal-oxide materials January 11th, 2021

Engineers find antioxidants improve nanoscale visualization of polymers January 8th, 2021

Nanomaterials researchers in Finland, the United States and China have created a color atlas for 466 unique varieties of single-walled carbon nanotubes. December 14th, 2020

Chemists get peek at novel fluorescence: Rice University scientists discover delayed phenomenon in carbon nanotubes December 3rd, 2020

Quantum nanoscience

Physicists propose a new theory to explain one dimensional quantum liquids formation January 15th, 2021

Microfabricated elastic diamonds improve material's electronic properties January 1st, 2021

Quantum wave in helium dimer filmed for the first time: Collaboration between Goethe University and the University of Oklahoma December 30th, 2020

Theory describes quantum phenomenon in nanomaterials: Osaka City University scientists have developed mathematical formulas to describe the current and fluctuations of strongly correlated electrons in quantum dots. Their theoretical predictions could soon be tested experimentally December 25th, 2020

NanoNews-Digest
The latest news from around the world, FREE




  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project