In a new paper published in eLight, a team of scientists led by Professors Haizheng Zhong and Yongyou Zhang from the Beijing Institute of Technology and Professor Haiyan Qin from Zhejiang University have discovered nonlocal effects in large semiconductor nanocrystals. They provide new strategies to achieve high-efficiency multiple excitons for quantum optics and energy conversation applications.
This article has been reviewed according to Science X's editorial process and policies . Editors have highlighted the following attributes while ensuring the content's credibility: Auger recombination lifetime linearly increases with volume in strong confinement regime (left), while exponentially increases in weak confinement regime (right) due to nonlocal effects. Credit: Peng Huang, Shipei Sun, Hairui Lei, Yongyou Zhang, Haiyan Qin and Haizheng Zhong Auger recombination in bulk materials only slightly affects the biexciton recombination due to the lower carrier density and momentum conservation. Thick-shelled CdSe/CdS nanocrystals were developed to suppress Auger recombination to gain high biexciton efficiency. The research team achieved this by reducing the wave function overlap between the electrons and holes. Large colloidal QDs may be suitable candidates to generate efficient biexciton emission, but have rarely been investigated. The research team reported that the Auger recombination rate in large perovskite nanocrystals could be exponentially decreased due to the nonlocal effects. Nonlocal effects refer to the influence of wave spatial dispersion on the light-matter…