Overcoming the Cut-Off Charge Transfer Bandgaps at the PbS Quantum Dot Interface

Handle URI:
http://hdl.handle.net/10754/583887
Title:
Overcoming the Cut-Off Charge Transfer Bandgaps at the PbS Quantum Dot Interface
Authors:
El-Ballouli, Ala'a O.; Alarousu, Erkki; Kirmani, Ahmad R.; Amassian, Aram ( 0000-0002-5734-1194 ) ; Bakr, Osman M. ( 0000-0002-3428-1002 ) ; Mohammed, Omar F. ( 0000-0001-8500-1130 )
Abstract:
Light harvesting from large size of semiconductor PbS quantum dots (QDs) with a bandgap of less than 1 eV is one of the greatest challenges precluding the development of PbS QD-based solar cells because the interfacial charge transfer (CT) from such QDs to the most commonly used electron acceptor materials is very inefficient, if it occurs at all. Thus, an alternative electron-accepting unit with a new driving force for CT is urgently needed to harvest the light from large-sized PbS QDs. Here, a cationic porphyrin is utilized as a new electron acceptor unit with unique features that bring the donor–acceptor components into close molecular proximity, allowing ultrafast and efficient electron transfer for QDs of all sizes, as inferred from the drastic photoluminescence quenching and the ultrafast formation of the porphyrin anionic species. The time-resolved results clearly demonstrate the possibility of modulating the electron transfer process between PbS QDs and porphyrin moieties not only by the size quantization effect but also by the interfacial electrostatic interaction between the positively charged porphyrin and the negatively charged QDs. This approach provides a new pathway for engineering QD-based solar cells that make the best use of the diverse photons making up the Sun's broad irradiance spectrum.
KAUST Department:
Physical Sciences and Engineering (PSE) Division; Solar and Photovoltaic Engineering Research Center (SPERC)
Citation:
Overcoming the Cut-Off Charge Transfer Bandgaps at the PbS Quantum Dot Interface 2015:n/a Advanced Functional Materials
Publisher:
Wiley-Blackwell
Journal:
Advanced Functional Materials
Issue Date:
17-Nov-2015
DOI:
10.1002/adfm.201504035
Type:
Article
ISSN:
1616301X
Additional Links:
http://doi.wiley.com/10.1002/adfm.201504035
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; Solar and Photovoltaic Engineering Research Center (SPERC)

Full metadata record

DC FieldValue Language
dc.contributor.authorEl-Ballouli, Ala'a O.en
dc.contributor.authorAlarousu, Erkkien
dc.contributor.authorKirmani, Ahmad R.en
dc.contributor.authorAmassian, Aramen
dc.contributor.authorBakr, Osman M.en
dc.contributor.authorMohammed, Omar F.en
dc.date.accessioned2015-12-14T12:25:42Zen
dc.date.available2015-12-14T12:25:42Zen
dc.date.issued2015-11-17en
dc.identifier.citationOvercoming the Cut-Off Charge Transfer Bandgaps at the PbS Quantum Dot Interface 2015:n/a Advanced Functional Materialsen
dc.identifier.issn1616301Xen
dc.identifier.doi10.1002/adfm.201504035en
dc.identifier.urihttp://hdl.handle.net/10754/583887en
dc.description.abstractLight harvesting from large size of semiconductor PbS quantum dots (QDs) with a bandgap of less than 1 eV is one of the greatest challenges precluding the development of PbS QD-based solar cells because the interfacial charge transfer (CT) from such QDs to the most commonly used electron acceptor materials is very inefficient, if it occurs at all. Thus, an alternative electron-accepting unit with a new driving force for CT is urgently needed to harvest the light from large-sized PbS QDs. Here, a cationic porphyrin is utilized as a new electron acceptor unit with unique features that bring the donor–acceptor components into close molecular proximity, allowing ultrafast and efficient electron transfer for QDs of all sizes, as inferred from the drastic photoluminescence quenching and the ultrafast formation of the porphyrin anionic species. The time-resolved results clearly demonstrate the possibility of modulating the electron transfer process between PbS QDs and porphyrin moieties not only by the size quantization effect but also by the interfacial electrostatic interaction between the positively charged porphyrin and the negatively charged QDs. This approach provides a new pathway for engineering QD-based solar cells that make the best use of the diverse photons making up the Sun's broad irradiance spectrum.en
dc.language.isoenen
dc.publisherWiley-Blackwellen
dc.relation.urlhttp://doi.wiley.com/10.1002/adfm.201504035en
dc.rightsThis is the peer reviewed version of the following article: El-Ballouli, A. O., Alarousu, E., Kirmani, A. R., Amassian, A., Bakr, O. M. and Mohammed, O. F. (2015), Overcoming the Cut-Off Charge Transfer Bandgaps at the PbS Quantum Dot Interface. Adv. Funct. Mater., which has been published in final form at http://doi.wiley.com/10.1002/adfm.201504035. This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.en
dc.titleOvercoming the Cut-Off Charge Transfer Bandgaps at the PbS Quantum Dot Interfaceen
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentSolar and Photovoltaic Engineering Research Center (SPERC)en
dc.identifier.journalAdvanced Functional Materialsen
dc.eprint.versionPost-printen
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)en
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