Photoexcitation Dynamics in Films of C-60 and Zn Phthalocyanine with a Layered Nanostructure

Lane, Paul A.
Cunningham, Paul D.
Melinger, Joseph S.
Kushto, Gary P.
Esentürk, Okan
Heilweil, Edwin J.
We elucidate photoexcitation dynamics in C-60 and zinc phthalocyanine (ZnPc) from picoseconds to milliseconds by transient absorption and time-resolved terahertz spectroscopy. Autoionization of C-60 is a precursor to photocarrier generation. Decay of the terahertz signal is due to decreasing photocarrier mobility over the first 20 ps and thereafter reflects recombination dynamics. Singlet diffusion rates in C-60 are determined by modeling the rise of ground state bleaching of ZnPc absorption following C-60 excitation. Recombination dynamics transform from bimolecular to monomolecular as the layer thickness is reduced, revealing a metastable exciplex at the C-60/ZnPc interface with a lifetime of 150 mu s.


Melinger, Joseph S.; Lane, Paul; Esentürk, Okan; Heilweil, Edwin (2010-06-25)
We present a study of photo-induced carrier dynamics in organic thin films that contain zinc phthalocyanine (ZnPc) and buckminsterfullerene (C-60) investigated by ultrafast time resolved terahertz spectroscopy (TRTS). We compare two classes of films: 1) blend films of ZnPc and C-60 prepared by co-evaporation, and 2) superlattice films from alternating neat layers of ZnPc and C-60, where the individual layer varies in thickness between 2 nm and 40 nm. These films are model structures for the charge generatio...
Carrier dynamics of composite and nanolayered films of zinc phthalocyanine and C-60 measured by time-resolved terahertz spectroscopy
Lane, Paul A.; Melinger, Joseph S.; Esentürk, Okan; Heilweil, Edwin J. (2009-08-06)
We present a study of charge transfer and carrier dynamics in films of zinc phthalocyanine (ZnPc) and buckmisnsterfullerene (C-60) investigated by time-resolved terahertz spectroscopy (TRTS). These films are model structures for charge generation layers in organic photovoltaics and their intrinsic properties are therefore of interest. We compare two classes of films: composite films of ZnPc and C-60 prepared by co-evaporation and layered ZnPc/C-60 films prepared by alternating deposition. We find evidence f...
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Citation Formats
P. A. Lane, P. D. Cunningham, J. S. Melinger, G. P. Kushto, O. Esentürk, and E. J. Heilweil, “Photoexcitation Dynamics in Films of C-60 and Zn Phthalocyanine with a Layered Nanostructure,” PHYSICAL REVIEW LETTERS, pp. 0–0, 2012, Accessed: 00, 2020. [Online]. Available: