Paramagnetic point defects and charge carriers in PbS and CdS nanocrystal polymer composites
Date
2009
Authors
Keeble, D J
Thomsen, Elizabeth
Stavrinadis, Alexandros
Samuel, I D W
Smith, Jason M
Watt, Andrew A.R.
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American Chemical Society
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.
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Journal of Physical Chemistry C
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Journal article
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2037-12-31
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