Photoconductivity of CdTe nanocrystal-based thin films: Te2- ligands lead to charge carrier diffusion lengths over 2 µm

Ryan W. Crisp, Rebecca Callahan, Obadiah G. Reid, Dmitriy S. Dolzhnikov, Dmitri V. Talapin, Garry Rumbles, Joseph M. Luther*, Nikos Kopidakis

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

We report on photoconductivity of films of CdTe nanocrystals (NCs) using time-resolved microwave photoconductivity (TRMC). Spherical and tetrapodal CdTe NCs with tunable size-dependent properties are studied as a function of surface ligand (including inorganic molecular chalcogenide species) and annealing temperature. Relatively high carrier mobility is measured for films of sintered tetrapod NCs (4 cm2/(V s)). Our TRMC findings show that Te2- capped CdTe NCs show a marked improvement in carrier mobility (11 cm2/(V s)), indicating that NC surface termination can be altered to play a crucial role in charge-carrier mobility even after the NC solids are sintered into bulk films.

Original languageEnglish
Pages (from-to)4815-4821
Number of pages7
JournalJournal of Physical Chemistry Letters
Volume6
Issue number23
DOIs
Publication statusPublished - 3 Dec 2015
Externally publishedYes

Keywords

  • CdTe
  • nanocrystal
  • photoconductivity

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