Effect of electronic structure on carrier multiplication efficiency: Comparative study of PbSe and CdSe nanocrystals

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Abstract

Recently, we demonstrated that PbSe nanocrystal quantum dots can efficiently produce multiple electron-hole pairs (excitons) in response to a single absorbed photon. To address the generality of this carrier-multiplication phenomenon to other materials, we perform a comparative study of multiexciton generation in PbSe and CdSe nanocrystals that have distinctly different electronic structures. We find that both materials exhibit high-efficiency carrier multiplication and the activation threshold is lower in CdSe nanocrystals than in PbSe nanocrystals (∼2.5 vs ∼2.9 energy gaps). Furthermore, the efficiencies of multiexciton generation are nearly identical for both materials despite a vast difference in both energy structures and carrier relaxation behaviors, strongly suggesting that this phenomenon is general to quantum-confined semiconductor nanocrystals.

Original languageEnglish
Article number253102
Pages (from-to)1-3
Number of pages3
JournalApplied Physics Letters
Volume87
Issue number25
DOIs
Publication statusPublished - Dec 27 2005

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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