Band alignment and charge transfer in CsPbBr3-CdSe nanoplatelet hybrids coupled by molecular linkers

Swayandipta Dey, Hagai Cohen, Iddo Pinkas, Hong Lin, Miri Kazes, Dan Oron

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Formation of a p-n junction-like with a large built-in field is demonstrated at the nanoscale, using two types of semiconducting nanoparticles, CsPbBr3 nanocrystals and CdSe nanoplatelets, capped with molecular linkers. By exploiting chemical recognition of the capping molecules, the two types of nanoparticles are brought into mutual contact, thus initiating spontaneous charge transfer and the formation of a strong junction field. Depending on the choice of capping molecules, the magnitude of the latter field is shown to vary in a broad range, corresponding to an interface potential step as large as ∼1 eV. The band diagram of the system as well as the emergence of photoinduced charge transfer processes across the interface is studied here by means of optical and photoelectron based spectroscopies. Our results propose an interesting template for generating and harnessing internal built-in fields in heterogeneous nanocrystal solids.

Original languageEnglish
Article number174704
JournalJournal of Chemical Physics
Volume151
Issue number17
DOIs
Publication statusPublished - Nov 7 2019

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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