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, Gary Rumbles, Joseph M. Luther, Nikos Kopidakis

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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 - Dec 3 2015

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Keywords

  • CdTe
  • nanocrystal
  • photoconductivity

ASJC Scopus subject areas

  • Materials Science(all)

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