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 journalArticlepeer-review

21 Citations (Scopus)

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 languageEnglish
Pages (from-to)17306-17312
Number of pages7
JournalJournal of Physical Chemistry C
Volume113
Issue number40
DOIs
Publication statusPublished - 8 Oct 2009

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