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Photoexcitation Dynamics in Films of C-60 and Zn Phthalocyanine with a Layered Nanostructure
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Date
2012-02-15
Author
Lane, Paul A.
Cunningham, Paul D.
Melinger, Joseph S.
Kushto, Gary P.
Esentürk, Okan
Heilweil, Edwin J.
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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.
Subject Keywords
Blends
,
Generation
,
Molecules
,
Thin-films
,
Solid c-60
,
Metal phthalocyanines
,
Carrier dynamics
,
Resolved terahertz spectroscopy
,
Solar-cells
,
Charge-transfer
URI
https://hdl.handle.net/11511/42146
Journal
PHYSICAL REVIEW LETTERS
DOI
https://doi.org/10.1103/physrevlett.108.077402
Collections
Department of Chemistry, Article