Quantum dots

Enhanced Biexciton Emission From Quantum Dots Near Plasmonic Nanostructures

Jing Zhao
Tuesday, October 25, 2016 - 4:30pm to 5:30pm

Metal and semiconductor quantum dots (QDs) exhibit unique size and composition dependent optical properties. The key elements that determine their optical properties are localized surface plasmons in metal nanoparticles and excitons in quantum dots. When QDs are placed near Au@SiO2 core@shell nanoparticles, their exciton/multiexciton emission lifetimes and quantum yields are modified due to the exciton-plasmon interaction. At the single QD level, we found that the ratio between the biexciton and exciton quantum yields of the QDs...

Spin Selective Charge Transport in Quantum Dots

  • By Aude Marjolin
  • 21 July 2016

The latest study in David Waldeck's group, published in ACS Nano Letters, demonstrates that chiral imprinted CdSe quantum dots (QDs) can act as spin selective filters for charge transport.

Semiconductor quantum dots remain an attractive material for photovoltaics because of their solution processability and potential for multiple exciton generation; enabling a promising route for the realization of low cost, high efficiency solar cells. In addition, previous experiments have shown that spin selective charge transport can enhance the photoconversion efficiencies of organic bulk heterojunctions. The present work therefore explores whether chiral induced spin selectivity (CISS) can be used as an alternative approach to affect charge transport through quantum dot films and demonstrates that quantum dot thin films composed of chiral semiconductors preferentially transmit electrons with a particular spin orientation.

SAMSUNG Global Research Outreach (GRO) Program

  • By Aude Marjolin
  • 13 April 2016

The SAMSUNG Global Research Outreach (GRO) Program is an important part of growing SAMSUNG's (Samsung Electronics & related Samsung companies) academic research engagement and collaboration platforms. World-class university researchers have been annually invited since 2009 to propose novel research ideas and to work with our R&D teams to foster technological innovation. This has resulted in actively collaborative relationships with over 100 leading universities worldwide.

Connecting the (Quantum) Dots: Spin Technique Moves Researchers Closer to Creating First Viable High-Speed Quantum Computer

  • By Aude Marjolin
  • 26 February 2013

Recent research offers a new spin on using nanoscale semiconductor structures to build faster computers and electronics. Literally.

Researchers at PQI and Delft University of Technology reveal in the Nature Nanotechnology a new method that better preserves the units necessary to power lightning-fast electronics, known as qubits (pronounced CUE-bits). Hole spins, rather than electron spins, can keep quantum bits in the same physical state up to 10 times longer than before, the report finds.