Molecular-structure control of ultrafast electron injection at cationic porphyrin-CdTe quantum dot interfaces

Handle URI:
http://hdl.handle.net/10754/564099
Title:
Molecular-structure control of ultrafast electron injection at cationic porphyrin-CdTe quantum dot interfaces
Authors:
Aly, Shawkat Mohammede ( 0000-0002-0455-1892 ) ; Ahmed, Ghada H.; Shaheen, Basamat; Sun, Jingya; Mohammed, Omar F. ( 0000-0001-8500-1130 )
Abstract:
Charge transfer (CT) at donor (D)/acceptor (A) interfaces is central to the functioning of photovoltaic and light-emitting devices. Understanding and controlling this process on the molecular level has been proven to be crucial for optimizing the performance of many energy-challenge relevant devices. Here, we report the experimental observations of controlled on/off ultrafast electron transfer (ET) at cationic porphyrin-CdTe quantum dot (QD) interfaces using femto- and nanosecond broad-band transient absorption (TA) spectroscopy. The time-resolved data demonstrate how one can turn on/off the electron injection from porphyrin to the CdTe QDs. With careful control of the molecular structure, we are able to tune the electron injection at the porphyrin-CdTe QD interface from zero to very efficient and ultrafast. In addition, our data demonstrate that the ET process occurs within our temporal resolution of 120 fs, which is one of the fastest times recorded for organic photovoltaics. © 2015 American Chemical Society.
KAUST Department:
Physical Sciences and Engineering (PSE) Division; Solar and Photovoltaic Engineering Research Center (SPERC); Chemical Science Program
Publisher:
American Chemical Society (ACS)
Journal:
The Journal of Physical Chemistry Letters
Issue Date:
5-Mar-2015
DOI:
10.1021/acs.jpclett.5b00235
Type:
Article
ISSN:
19487185
Sponsors:
S.M.A. is grateful for the postdoctoral fellowship provided by SABIC. The work reported here was supported by the King Abdullah University of Science and Technology.
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; Chemical Science Program; Solar and Photovoltaic Engineering Research Center (SPERC)

Full metadata record

DC FieldValue Language
dc.contributor.authorAly, Shawkat Mohammedeen
dc.contributor.authorAhmed, Ghada H.en
dc.contributor.authorShaheen, Basamaten
dc.contributor.authorSun, Jingyaen
dc.contributor.authorMohammed, Omar F.en
dc.date.accessioned2015-08-03T12:32:06Zen
dc.date.available2015-08-03T12:32:06Zen
dc.date.issued2015-03-05en
dc.identifier.issn19487185en
dc.identifier.doi10.1021/acs.jpclett.5b00235en
dc.identifier.urihttp://hdl.handle.net/10754/564099en
dc.description.abstractCharge transfer (CT) at donor (D)/acceptor (A) interfaces is central to the functioning of photovoltaic and light-emitting devices. Understanding and controlling this process on the molecular level has been proven to be crucial for optimizing the performance of many energy-challenge relevant devices. Here, we report the experimental observations of controlled on/off ultrafast electron transfer (ET) at cationic porphyrin-CdTe quantum dot (QD) interfaces using femto- and nanosecond broad-band transient absorption (TA) spectroscopy. The time-resolved data demonstrate how one can turn on/off the electron injection from porphyrin to the CdTe QDs. With careful control of the molecular structure, we are able to tune the electron injection at the porphyrin-CdTe QD interface from zero to very efficient and ultrafast. In addition, our data demonstrate that the ET process occurs within our temporal resolution of 120 fs, which is one of the fastest times recorded for organic photovoltaics. © 2015 American Chemical Society.en
dc.description.sponsorshipS.M.A. is grateful for the postdoctoral fellowship provided by SABIC. The work reported here was supported by the King Abdullah University of Science and Technology.en
dc.publisherAmerican Chemical Society (ACS)en
dc.subjectcationic porphyrinen
dc.subjectCdTe quantum dotsen
dc.subjectfemtochemistryen
dc.subjectinterfacial charge transferen
dc.subjecttime-resolved laser spectroscopyen
dc.titleMolecular-structure control of ultrafast electron injection at cationic porphyrin-CdTe quantum dot interfacesen
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentSolar and Photovoltaic Engineering Research Center (SPERC)en
dc.contributor.departmentChemical Science Programen
dc.identifier.journalThe Journal of Physical Chemistry Lettersen
dc.contributor.institutionChemistry Department, Assiut University, Egypten
kaust.authorAly, Shawkat Mohammedeen
kaust.authorMohammed, Omar F.en
kaust.authorAhmed, Ghada H.en
kaust.authorShaheen, Basamaten
kaust.authorSun, Jingyaen
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