Multiple Exciton Generation in Films of Electronically Coupled PbSe Quantum Dots
We study multiple exciton generation (MEG) in electronically coupled films of PbSe quantum dots (QDs) employing ultrafast time-resolved transient absorption spectroscopy. We demonstrate that the MEG efficiency in PbSe does not decrease when the QDs are treated with hydrazine, which has been shown to...
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| Veröffentlicht in: | Nano Letters 2007-06, Vol.7 (6), p.1779-1784 |
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| container_title | Nano Letters |
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| creator | Luther, Joseph M. Beard, Matthew C. Song, Qing Law, Matt Ellingson, Randy J. Nozik, Arthur J. |
| description | We study multiple exciton generation (MEG) in electronically coupled films of PbSe quantum dots (QDs) employing ultrafast time-resolved transient absorption spectroscopy. We demonstrate that the MEG efficiency in PbSe does not decrease when the QDs are treated with hydrazine, which has been shown to greatly enhance carrier transport in PbSe QD films by decreasing the interdot distance. The quantum yield is measured and compared to previously reported values for electronically isolated QDs suspended in organic solvents at ∼4 and 4.5 times the effective band gap. A slightly modified analysis is applied to extract the MEG efficiency and the absorption cross section of each sample at the pump wavelength. We compare the absorption cross sections of our samples to that of bulk PbSe. We find that both the biexciton lifetime and the absorption cross section increase in films relative to isolated QDs in solution. |
| doi_str_mv | 10.1021/nl0708617 |
| format | Article |
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(NREL), Golden, CO (United States)</creatorcontrib><description>We study multiple exciton generation (MEG) in electronically coupled films of PbSe quantum dots (QDs) employing ultrafast time-resolved transient absorption spectroscopy. We demonstrate that the MEG efficiency in PbSe does not decrease when the QDs are treated with hydrazine, which has been shown to greatly enhance carrier transport in PbSe QD films by decreasing the interdot distance. The quantum yield is measured and compared to previously reported values for electronically isolated QDs suspended in organic solvents at ∼4 and 4.5 times the effective band gap. A slightly modified analysis is applied to extract the MEG efficiency and the absorption cross section of each sample at the pump wavelength. We compare the absorption cross sections of our samples to that of bulk PbSe. We find that both the biexciton lifetime and the absorption cross section increase in films relative to isolated QDs in solution.</description><identifier>ISSN: 1530-6984</identifier><identifier>EISSN: 1530-6992</identifier><identifier>DOI: 10.1021/nl0708617</identifier><identifier>PMID: 17530913</identifier><language>eng</language><publisher>Washington, DC: American Chemical Society</publisher><subject>Basic Sciences ; Computer Simulation ; CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY ; Condensed matter: electronic structure, electrical, magnetic, and optical properties ; Cross-disciplinary physics: materials science; rheology ; Crystallization - methods ; Electron states ; Electron Transport ; Energy Transfer ; Exact sciences and technology ; EXCITONS ; Excitons and related phenomena ; Fullerenes and related materials ; Lead - chemistry ; LEAD SELENIDES ; Macromolecular Substances - chemistry ; MATERIALS SCIENCE ; Materials Testing ; Membranes, Artificial ; Models, Chemical ; Molecular Conformation ; Nanocrystalline materials ; Nanoscale materials and structures: fabrication and characterization ; Nanostructures - chemistry ; Nanostructures - ultrastructure ; Nanotechnology - methods ; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation ; Particle Size ; Physics ; QUANTUM DOTS ; Selenium Compounds - chemistry ; SOLAR ENERGY ; Surface Properties ; Visible and ultraviolet spectra</subject><ispartof>Nano Letters, 2007-06, Vol.7 (6), p.1779-1784</ispartof><rights>Copyright © 2007 American Chemical Society</rights><rights>2007 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a435t-270159ac5ef424ecaed75e57e65710786fe436035f5519ad48c34daf835a6a353</citedby><cites>FETCH-LOGICAL-a435t-270159ac5ef424ecaed75e57e65710786fe436035f5519ad48c34daf835a6a353</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://pubs.acs.org/doi/pdf/10.1021/nl0708617$$EPDF$$P50$$Gacs$$H</linktopdf><linktohtml>$$Uhttps://pubs.acs.org/doi/10.1021/nl0708617$$EHTML$$P50$$Gacs$$H</linktohtml><link.rule.ids>314,776,780,881,2751,27055,27903,27904,56717,56767</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=18853919$$DView record in Pascal Francis$$Hfree_for_read</backlink><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/17530913$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink><backlink>$$Uhttps://www.osti.gov/biblio/915657$$D View this record in Osti.gov$$Hfree_for_read</backlink></links><search><creatorcontrib>Luther, Joseph M.</creatorcontrib><creatorcontrib>Beard, Matthew C.</creatorcontrib><creatorcontrib>Song, Qing</creatorcontrib><creatorcontrib>Law, Matt</creatorcontrib><creatorcontrib>Ellingson, Randy J.</creatorcontrib><creatorcontrib>Nozik, Arthur J.</creatorcontrib><creatorcontrib>National Renewable Energy Lab. (NREL), Golden, CO (United States)</creatorcontrib><title>Multiple Exciton Generation in Films of Electronically Coupled PbSe Quantum Dots</title><title>Nano Letters</title><addtitle>Nano Lett</addtitle><description>We study multiple exciton generation (MEG) in electronically coupled films of PbSe quantum dots (QDs) employing ultrafast time-resolved transient absorption spectroscopy. We demonstrate that the MEG efficiency in PbSe does not decrease when the QDs are treated with hydrazine, which has been shown to greatly enhance carrier transport in PbSe QD films by decreasing the interdot distance. The quantum yield is measured and compared to previously reported values for electronically isolated QDs suspended in organic solvents at ∼4 and 4.5 times the effective band gap. A slightly modified analysis is applied to extract the MEG efficiency and the absorption cross section of each sample at the pump wavelength. We compare the absorption cross sections of our samples to that of bulk PbSe. We find that both the biexciton lifetime and the absorption cross section increase in films relative to isolated QDs in solution.</description><subject>Basic Sciences</subject><subject>Computer Simulation</subject><subject>CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY</subject><subject>Condensed matter: electronic structure, electrical, magnetic, and optical properties</subject><subject>Cross-disciplinary physics: materials science; rheology</subject><subject>Crystallization - methods</subject><subject>Electron states</subject><subject>Electron Transport</subject><subject>Energy Transfer</subject><subject>Exact sciences and technology</subject><subject>EXCITONS</subject><subject>Excitons and related phenomena</subject><subject>Fullerenes and related materials</subject><subject>Lead - chemistry</subject><subject>LEAD SELENIDES</subject><subject>Macromolecular Substances - chemistry</subject><subject>MATERIALS SCIENCE</subject><subject>Materials Testing</subject><subject>Membranes, Artificial</subject><subject>Models, Chemical</subject><subject>Molecular Conformation</subject><subject>Nanocrystalline materials</subject><subject>Nanoscale materials and structures: fabrication and characterization</subject><subject>Nanostructures - chemistry</subject><subject>Nanostructures - ultrastructure</subject><subject>Nanotechnology - methods</subject><subject>Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation</subject><subject>Particle Size</subject><subject>Physics</subject><subject>QUANTUM DOTS</subject><subject>Selenium Compounds - chemistry</subject><subject>SOLAR ENERGY</subject><subject>Surface Properties</subject><subject>Visible and ultraviolet spectra</subject><issn>1530-6984</issn><issn>1530-6992</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2007</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNpt0E1LBCEYB3CJovdDXyDsUNBhS8dxHI-xbS9QVFRnMecZMhzd1IH69hm7tJdOPuDPvw9_hA4oOaOkoufeEUHahoo1tE05I5NGymr9b27rLbST0gchRDJONtEWFeVGUraNHu9Hl-3cAZ59GZuDx9fgIepsy2g9vrJuSDj0eObA5Bi8Ndq5bzwNY3nU4ce3Z8BPo_Z5HPBlyGkPbfTaJdhfnrvo9Wr2Mr2Z3D1c304v7ia6ZjxPKkEol9pw6OuqBqOhExy4gIYLSkTb9FCzhjDec06l7urWsLrTfcu4bjTjbBcdLXJDylalsjuYdxO8L2sqSXnJKeZkYeYxfI6QshpsMuCc9hDGpARpKlaxusDTBTQxpBShV_NoBx2_FSXqt2L1V3Gxh8vQ8W2AbiWXnRZwvAQ6lbL6qL2xaeXaljNJ5cppk9RHGKMvff3z4Q_cnY16</recordid><startdate>20070601</startdate><enddate>20070601</enddate><creator>Luther, Joseph M.</creator><creator>Beard, Matthew C.</creator><creator>Song, Qing</creator><creator>Law, Matt</creator><creator>Ellingson, Randy J.</creator><creator>Nozik, Arthur J.</creator><general>American Chemical Society</general><scope>IQODW</scope><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7X8</scope><scope>OTOTI</scope></search><sort><creationdate>20070601</creationdate><title>Multiple Exciton Generation in Films of Electronically Coupled PbSe Quantum Dots</title><author>Luther, Joseph M. ; Beard, Matthew C. ; Song, Qing ; Law, Matt ; Ellingson, Randy J. ; Nozik, Arthur J.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a435t-270159ac5ef424ecaed75e57e65710786fe436035f5519ad48c34daf835a6a353</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2007</creationdate><topic>Basic Sciences</topic><topic>Computer Simulation</topic><topic>CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY</topic><topic>Condensed matter: electronic structure, electrical, magnetic, and optical properties</topic><topic>Cross-disciplinary physics: materials science; rheology</topic><topic>Crystallization - methods</topic><topic>Electron states</topic><topic>Electron Transport</topic><topic>Energy Transfer</topic><topic>Exact sciences and technology</topic><topic>EXCITONS</topic><topic>Excitons and related phenomena</topic><topic>Fullerenes and related materials</topic><topic>Lead - chemistry</topic><topic>LEAD SELENIDES</topic><topic>Macromolecular Substances - chemistry</topic><topic>MATERIALS SCIENCE</topic><topic>Materials Testing</topic><topic>Membranes, Artificial</topic><topic>Models, Chemical</topic><topic>Molecular Conformation</topic><topic>Nanocrystalline materials</topic><topic>Nanoscale materials and structures: fabrication and characterization</topic><topic>Nanostructures - chemistry</topic><topic>Nanostructures - ultrastructure</topic><topic>Nanotechnology - methods</topic><topic>Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation</topic><topic>Particle Size</topic><topic>Physics</topic><topic>QUANTUM DOTS</topic><topic>Selenium Compounds - chemistry</topic><topic>SOLAR ENERGY</topic><topic>Surface Properties</topic><topic>Visible and ultraviolet spectra</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Luther, Joseph M.</creatorcontrib><creatorcontrib>Beard, Matthew C.</creatorcontrib><creatorcontrib>Song, Qing</creatorcontrib><creatorcontrib>Law, Matt</creatorcontrib><creatorcontrib>Ellingson, Randy J.</creatorcontrib><creatorcontrib>Nozik, Arthur J.</creatorcontrib><creatorcontrib>National Renewable Energy Lab. (NREL), Golden, CO (United States)</creatorcontrib><collection>Pascal-Francis</collection><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><collection>OSTI.GOV</collection><jtitle>Nano Letters</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Luther, Joseph M.</au><au>Beard, Matthew C.</au><au>Song, Qing</au><au>Law, Matt</au><au>Ellingson, Randy J.</au><au>Nozik, Arthur J.</au><aucorp>National Renewable Energy Lab. (NREL), Golden, CO (United States)</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Multiple Exciton Generation in Films of Electronically Coupled PbSe Quantum Dots</atitle><jtitle>Nano Letters</jtitle><addtitle>Nano Lett</addtitle><date>2007-06-01</date><risdate>2007</risdate><volume>7</volume><issue>6</issue><spage>1779</spage><epage>1784</epage><pages>1779-1784</pages><issn>1530-6984</issn><eissn>1530-6992</eissn><abstract>We study multiple exciton generation (MEG) in electronically coupled films of PbSe quantum dots (QDs) employing ultrafast time-resolved transient absorption spectroscopy. We demonstrate that the MEG efficiency in PbSe does not decrease when the QDs are treated with hydrazine, which has been shown to greatly enhance carrier transport in PbSe QD films by decreasing the interdot distance. The quantum yield is measured and compared to previously reported values for electronically isolated QDs suspended in organic solvents at ∼4 and 4.5 times the effective band gap. A slightly modified analysis is applied to extract the MEG efficiency and the absorption cross section of each sample at the pump wavelength. We compare the absorption cross sections of our samples to that of bulk PbSe. We find that both the biexciton lifetime and the absorption cross section increase in films relative to isolated QDs in solution.</abstract><cop>Washington, DC</cop><pub>American Chemical Society</pub><pmid>17530913</pmid><doi>10.1021/nl0708617</doi><tpages>6</tpages></addata></record> |
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| subjects | Basic Sciences Computer Simulation CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY Condensed matter: electronic structure, electrical, magnetic, and optical properties Cross-disciplinary physics: materials science rheology Crystallization - methods Electron states Electron Transport Energy Transfer Exact sciences and technology EXCITONS Excitons and related phenomena Fullerenes and related materials Lead - chemistry LEAD SELENIDES Macromolecular Substances - chemistry MATERIALS SCIENCE Materials Testing Membranes, Artificial Models, Chemical Molecular Conformation Nanocrystalline materials Nanoscale materials and structures: fabrication and characterization Nanostructures - chemistry Nanostructures - ultrastructure Nanotechnology - methods Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation Particle Size Physics QUANTUM DOTS Selenium Compounds - chemistry SOLAR ENERGY Surface Properties Visible and ultraviolet spectra |
| title | Multiple Exciton Generation in Films of Electronically Coupled PbSe Quantum Dots |
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