Molecular-structure control of ultrafast electron injection at cationic porphyrin-CdTe quantum dot interfaces
KAUST DepartmentChemical Science Program
KAUST Solar Center (KSC)
Physical Science and Engineering (PSE) Division
Ultrafast Laser Spectroscopy and Four-dimensional Electron Imaging Research Group
Online Publication Date2015-02-13
Print Publication Date2015-03-05
Embargo End Date2016-02-11
Permanent link to this recordhttp://hdl.handle.net/10754/564099
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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.
SponsorsS.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.
PublisherAmerican Chemical Society (ACS)
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