Spin selectivity

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.