Improving quantum dot interactions, one layer at a time

Improving quantum dot interactions, one layer at a time
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

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.

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 in layered structures of quantum dots called superlattices.

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

Quantum dots are nanometer-sized semiconductor particles with interesting optical and . When light is shone on them, for example, they emit strong 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, 2-D and 3-D 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 with other nanoparticles, will expand the possibilities of new material design," says Kim.


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More information: TaeGi Lee et al. Controlling the dimension of the quantum resonance in CdTe quantum dot superlattices fabricated via layer-by-layer assembly, Nature Communications (2020). DOI: 10.1038/s41467-020-19337-0
Journal information: Nature Communications

Citation: Improving quantum dot interactions, one layer at a time (2020, November 20) retrieved 27 November 2020 from https://phys.org/news/2020-11-quantum-dot-interactions-layer.html
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