Photoconductivity of CdTe Nanocrystal-Based Thin Films: Te(2-) Ligands Lead To Charge Carrier Diffusion Lengths Over 2 μm

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 ann...

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Published inThe journal of physical chemistry letters Vol. 6; no. 23; pp. 4815 - 4821
Main Authors Crisp, Ryan W, Callahan, Rebecca, Reid, Obadiah G, Dolzhnikov, Dmitriy S, Talapin, Dmitri V, Rumbles, Garry, Luther, Joseph M, Kopidakis, Nikos
Format Journal Article
LanguageEnglish
Published United States 03.12.2015
Subjects
photoconductivity
nanocrystal
CdTe
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Summary: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 cm(2)/(V s)). Our TRMC findings show that Te(2-) capped CdTe NCs show a marked improvement in carrier mobility (11 cm(2)/(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.
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content type line 23
ISSN:1948-7185
DOI:10.1021/acs.jpclett.5b02252