Paramagnetic Point Defects and Charge Carriers in PbS and CdS Nanocrystal Polymer Composites

David J. Keeble; Elizabeth A. Thomsen; Alexandros Stavrinadis; Ifor D. W. Samuel; Jason M. Smith; Andrew A. R. Watt

doi:10.1021/jp9044429

Paramagnetic Point Defects and Charge Carriers in PbS and CdS Nanocrystal Polymer Composites

David J. Keeble, Elizabeth A. Thomsen, Alexandros Stavrinadis, Ifor D. W. Samuel, Jason M. Smith, Andrew A. R. Watt

Research output: Contribution to journal › Article › peer-review

Abstract

Using electron paramagnetic resonance we identify point defects in CdS nanocrystals. A spectrum consistent With Cd vacancies in distorted sites is observed, and evidence for S vacancies is presented. Light-induced paramagnetic states attributed to defects are also detected in PbS nanocrystals. Nanocrystal shallow donor electron states are observed in CdS composites with the Conjugated polymer poly [2-methoxy-5-(2'-ethylhexyloxy)-p-phenylene vinylene] (MEH-PPV), and show an increased g-value compared to the bulk, which is Consistent With quantum confinement. Dark state MEH-PPV polarons are observed for composites with small (3.6 nm) CdS nanocrystals.

Original language	English
Pages (from-to)	17306-17312
Number of pages	7
Journal	Journal of Physical Chemistry C
Volume	113
Issue number	40
DOIs	https://doi.org/10.1021/jp9044429
Publication status	Published - 8 Oct 2009

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title = "Paramagnetic Point Defects and Charge Carriers in PbS and CdS Nanocrystal Polymer Composites",

abstract = "Using electron paramagnetic resonance we identify point defects in CdS nanocrystals. A spectrum consistent With Cd vacancies in distorted sites is observed, and evidence for S vacancies is presented. Light-induced paramagnetic states attributed to defects are also detected in PbS nanocrystals. Nanocrystal shallow donor electron states are observed in CdS composites with the Conjugated polymer poly [2-methoxy-5-(2'-ethylhexyloxy)-p-phenylene vinylene] (MEH-PPV), and show an increased g-value compared to the bulk, which is Consistent With quantum confinement. Dark state MEH-PPV polarons are observed for composites with small (3.6 nm) CdS nanocrystals.",

author = "Keeble, {David J.} and Thomsen, {Elizabeth A.} and Alexandros Stavrinadis and Samuel, {Ifor D. W.} and Smith, {Jason M.} and Watt, {Andrew A. R.}",

year = "2009",

month = oct,

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doi = "10.1021/jp9044429",

language = "English",

volume = "113",

pages = "17306--17312",

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publisher = "American Chemical Society (ACS)",

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TY - JOUR

T1 - Paramagnetic Point Defects and Charge Carriers in PbS and CdS Nanocrystal Polymer Composites

AU - Keeble, David J.

AU - Thomsen, Elizabeth A.

AU - Stavrinadis, Alexandros

AU - Samuel, Ifor D. W.

AU - Smith, Jason M.

AU - Watt, Andrew A. R.

PY - 2009/10/8

Y1 - 2009/10/8

N2 - Using electron paramagnetic resonance we identify point defects in CdS nanocrystals. A spectrum consistent With Cd vacancies in distorted sites is observed, and evidence for S vacancies is presented. Light-induced paramagnetic states attributed to defects are also detected in PbS nanocrystals. Nanocrystal shallow donor electron states are observed in CdS composites with the Conjugated polymer poly [2-methoxy-5-(2'-ethylhexyloxy)-p-phenylene vinylene] (MEH-PPV), and show an increased g-value compared to the bulk, which is Consistent With quantum confinement. Dark state MEH-PPV polarons are observed for composites with small (3.6 nm) CdS nanocrystals.

AB - Using electron paramagnetic resonance we identify point defects in CdS nanocrystals. A spectrum consistent With Cd vacancies in distorted sites is observed, and evidence for S vacancies is presented. Light-induced paramagnetic states attributed to defects are also detected in PbS nanocrystals. Nanocrystal shallow donor electron states are observed in CdS composites with the Conjugated polymer poly [2-methoxy-5-(2'-ethylhexyloxy)-p-phenylene vinylene] (MEH-PPV), and show an increased g-value compared to the bulk, which is Consistent With quantum confinement. Dark state MEH-PPV polarons are observed for composites with small (3.6 nm) CdS nanocrystals.

U2 - 10.1021/jp9044429

DO - 10.1021/jp9044429

M3 - Article

SN - 1932-7447

VL - 113

SP - 17306

EP - 17312

JO - Journal of Physical Chemistry C

JF - Journal of Physical Chemistry C

IS - 40

ER -

Paramagnetic Point Defects and Charge Carriers in PbS and CdS Nanocrystal Polymer Composites

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