Metal Magic: Creating Dream Materials with Semiconductor Quantum Dots

Tech 2023-05-31 08:45:05 Source: Network

Science and Technology Daily, Beijing, May 30 (Reporter Zhang Jiaxin) According to the latest issue of Nature Communication, a team including researchers from Japan's RIKEN Emerging Materials Science Center has successfully created a "superlattice" composed of lead sulfide semiconductor colloidal quantum dots, in which researchers have realized the conductivity of similar metals, which is 1 million times higher than the current quantum dot displays, And it will not affect the quantum confinement effect. This progress may completely change quantum dot technology, enabling new applications in electroluminescent devices, lasers, thermoelectric devices, and sensors

Science and Technology Daily, Beijing, May 30 (Reporter Zhang Jiaxin) According to the latest issue of Nature Communication, a team including researchers from Japan's RIKEN Emerging Materials Science Center has successfully created a "superlattice" composed of lead sulfide semiconductor colloidal quantum dots, in which researchers have realized the conductivity of similar metals, which is 1 million times higher than the current quantum dot displays, And it will not affect the quantum confinement effect. This progress may completely change quantum dot technology, enabling new applications in electroluminescent devices, lasers, thermoelectric devices, and sensors.

Semiconductor colloidal quantum dots have attracted great research interest due to their unique optical properties, which are caused by quantum confinement effects and can be applied to solar cells to improve energy conversion efficiency; In biological imaging, they can be used as fluorescent probes and electronic displays; Scientists can even use their ability to capture and manipulate individual electrons for quantum computing.

However, making semiconductor quantum dots conduct electricity efficiently has always been a major challenge, hindering their full utilization. This is mainly because they lack directional order during assembly.

The key to achieving a breakthrough in this study is to directly connect the quantum dots in the lattice to each other, without the need for ligands, and to accurately orient their faces.

Researchers tested the conductivity of the new material, and when using a double layer transistor to increase carrier density, they found that at a certain point, its conductivity was one million times higher than that of current quantum dot displays. Importantly, the quantum confinement of individual quantum dots remains unchanged, which means that despite their high conductivity, they will not lose function.

The researchers said that precise directional control of the quantum dots in the assembly can lead to high electron mobility and metal behavior. This breakthrough may open up new avenues for the use of semiconductor quantum dots in emerging technologies.

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