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

doi:10.1021/acs.jpclett.5b02252

Photoconductivity of CdTe nanocrystal-based thin films: Te^2- 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 journal › Article › peer-review

22 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 Te^2- 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 language	English
Pages (from-to)	4815-4821
Number of pages	7
Journal	Journal of Physical Chemistry Letters
Volume	6
Issue number	23
DOIs	https://doi.org/10.1021/acs.jpclett.5b02252
Publication status	Published - 3 Dec 2015
Externally published	Yes

Keywords

CdTe
nanocrystal
photoconductivity

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10.1021/acs.jpclett.5b02252

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

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.",

keywords = "CdTe, nanocrystal, photoconductivity",

author = "Crisp, \{Ryan W.\} and Rebecca Callahan and Reid, \{Obadiah G.\} and Dolzhnikov, \{Dmitriy S.\} and Talapin, \{Dmitri V.\} and Garry Rumbles and Luther, \{Joseph M.\} and Nikos Kopidakis",

year = "2015",

month = dec,

day = "3",

doi = "10.1021/acs.jpclett.5b02252",

language = "English",

volume = "6",

pages = "4815--4821",

journal = "Journal of Physical Chemistry Letters",

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publisher = "American Chemical Society",

number = "23",

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T1 - Photoconductivity of CdTe nanocrystal-based thin films

T2 - Te2- ligands lead to charge carrier diffusion lengths over 2 µm

AU - Crisp, Ryan W.

AU - Callahan, Rebecca

AU - Reid, Obadiah G.

AU - Dolzhnikov, Dmitriy S.

AU - Talapin, Dmitri V.

AU - Rumbles, Garry

AU - Luther, Joseph M.

AU - Kopidakis, Nikos

PY - 2015/12/3

Y1 - 2015/12/3

N2 - 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.

AB - 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.

KW - CdTe

KW - nanocrystal

KW - photoconductivity

UR - https://www.scopus.com/pages/publications/84949024527

U2 - 10.1021/acs.jpclett.5b02252

DO - 10.1021/acs.jpclett.5b02252

M3 - Article

C2 - 26571095

AN - SCOPUS:84949024527

SN - 1948-7185

VL - 6

SP - 4815

EP - 4821

JO - Journal of Physical Chemistry Letters

JF - Journal of Physical Chemistry Letters

IS - 23

ER -

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

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Keywords

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