Paramagnetic Point Defects and Charge Carriers in PbS and CdS Nanocrystal Polymer Composites
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. Nanoc...
| Main Authors: | , , , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
2009
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| _version_ | 1797082931143901184 |
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| author | Keeble, D Thomsen, E Stavrinadis, A Samuel, I Smith, J Watt, A |
| author_facet | Keeble, D Thomsen, E Stavrinadis, A Samuel, I Smith, J Watt, A |
| author_sort | Keeble, D |
| collection | OXFORD |
| description | 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. © 2009 American Chemical Society. |
| first_indexed | 2024-03-07T01:34:54Z |
| format | Journal article |
| id | oxford-uuid:94d3eb8f-06d8-4752-9113-56b8dc5be271 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T01:34:54Z |
| publishDate | 2009 |
| record_format | dspace |
| spelling | oxford-uuid:94d3eb8f-06d8-4752-9113-56b8dc5be2712022-03-26T23:42:04ZParamagnetic Point Defects and Charge Carriers in PbS and CdS Nanocrystal Polymer CompositesJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:94d3eb8f-06d8-4752-9113-56b8dc5be271EnglishSymplectic Elements at Oxford2009Keeble, DThomsen, EStavrinadis, ASamuel, ISmith, JWatt, AUsing 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. © 2009 American Chemical Society. |
| spellingShingle | Keeble, D Thomsen, E Stavrinadis, A Samuel, I Smith, J Watt, A Paramagnetic Point Defects and Charge Carriers in PbS and CdS Nanocrystal Polymer Composites |
| title | Paramagnetic Point Defects and Charge Carriers in PbS and CdS Nanocrystal Polymer Composites |
| title_full | Paramagnetic Point Defects and Charge Carriers in PbS and CdS Nanocrystal Polymer Composites |
| title_fullStr | Paramagnetic Point Defects and Charge Carriers in PbS and CdS Nanocrystal Polymer Composites |
| title_full_unstemmed | Paramagnetic Point Defects and Charge Carriers in PbS and CdS Nanocrystal Polymer Composites |
| title_short | Paramagnetic Point Defects and Charge Carriers in PbS and CdS Nanocrystal Polymer Composites |
| title_sort | paramagnetic point defects and charge carriers in pbs and cds nanocrystal polymer composites |
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