Photoconductivity of CdTe Nanocrystal-Based Thin Films: Te2- Ligands Lead To Charge Carrier Diffusion Lengths Over 2 Micrometers

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

Research output: Contribution to journalArticlepeer-review

19 Scopus Citations

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 languageAmerican English
Pages (from-to)4815-4821
Number of pages7
JournalJournal of Physical Chemistry Letters
Volume6
Issue number23
DOIs
StatePublished - 3 Dec 2015

Bibliographical note

Publisher Copyright:
© 2015 American Chemical Society.

NREL Publication Number

  • NREL/JA-5900-65159

Keywords

  • CdTe
  • nanocrystals
  • photoconductivity
  • solar-photochemistry

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