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

Research output: Contribution to journalArticle

10 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 - Dec 3 2015

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Photoconductivity
diffusion length
Charge carriers
photoconductivity
Nanocrystals
charge carriers
nanocrystals
Ligands
Thin films
ligands
Carrier mobility
thin films
carrier mobility
Microwaves
microwaves
Annealing
annealing

Keywords

  • CdTe
  • nanocrystal
  • photoconductivity

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Photoconductivity of CdTe Nanocrystal-Based Thin Films : Te2- Ligands Lead to Charge Carrier Diffusion Lengths over 2 Μm. / Crisp, Ryan W.; Callahan, Rebecca; Reid, Obadiah G.; Dolzhnikov, Dmitriy S.; Talapin, Dmitri V.; Rumbles, Gary; Luther, Joseph M.; Kopidakis, Nikos.

In: Journal of Physical Chemistry Letters, Vol. 6, No. 23, 03.12.2015, p. 4815-4821.

Research output: Contribution to journalArticle

Crisp, Ryan W. ; Callahan, Rebecca ; Reid, Obadiah G. ; Dolzhnikov, Dmitriy S. ; Talapin, Dmitri V. ; Rumbles, Gary ; Luther, Joseph M. ; Kopidakis, Nikos. / Photoconductivity of CdTe Nanocrystal-Based Thin Films : Te2- Ligands Lead to Charge Carrier Diffusion Lengths over 2 Μm. In: Journal of Physical Chemistry Letters. 2015 ; Vol. 6, No. 23. pp. 4815-4821.
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