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Proceedings Paper

Carrier dynamics of composite and nanolayered films of zinc phthalocyanine and C60 measured by time-resolved terahertz spectroscopy
Author(s): Paul A. Lane; Joseph S. Melinger; Okan Esenturk; Edwin J. Heilweil
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Paper Abstract

We present a study of charge transfer and carrier dynamics in films of zinc phthalocyanine (ZnPc) and buckmisnsterfullerene (C60) 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 C60 prepared by co-evaporation and layered ZnPc/C60 films prepared by alternating deposition. We find evidence for a short-lived charge transfer state of C60 that decays within several picoseconds of excitation. In contrast, both composite and multi-layered films have a long-lived THz absorption that depends on the composition and structure of the fims. The optimum composition for charge transfer within composite films is a 1:1 blend of ZnPc and C60. Amongst the layered films, there is an increase in charge photogeneration with decreasing layer thickness with a sample having ultrathin (2 nm) exhibiting the strongest THz absorption. A much stronger THz absorption signal was obtained from the layered structure than for the best composite film, even both structures contain similar fractions of ZnPc and C60 .

Paper Details

Date Published: 15 October 2009
PDF: 8 pages
Proc. SPIE 7416, Organic Photovoltaics X, 74161Z (15 October 2009); doi: 10.1117/12.845719
Show Author Affiliations
Paul A. Lane, Naval Research Lab. (United States)
Joseph S. Melinger, Naval Research Lab. (United States)
Okan Esenturk, National Institute of Standards and Technology (United States)
Edwin J. Heilweil, National Institute of Standards and Technology (United States)

Published in SPIE Proceedings Vol. 7416:
Organic Photovoltaics X
Zakya H. Kafafi; Paul A. Lane, Editor(s)

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