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PHOTO-CARRIER DYNAMICS OF BLENDED AND MULTI-LAYERED FILMS OF ZINC PHTHALOCYANINE AND C-60 MEASURED BY TIME-RESOLVED TERAHERTZ SPECTROSCOPY
Date
2010-06-25
Author
Melinger, Joseph S.
Lane, Paul
Esentürk, Okan
Heilweil, Edwin
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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 generation layers in organic photovoltaics, and their photo-carrier dynamics on a femtosecond to nanosecond timescale is of high interest. Using TRTS, which employs an optical pump pulse and a time delayed terahertz (THz) probe pulse, we find evidence for a short-lived charge transfer state of C-60 that decays within several picoseconds of excitation. Both blend and superlattice films have a long-lived (> 80 picoseconds) THz absorption that is dependent on the structure and composition of the films. The optimum composition for maximum photocarrier generation efficiency is a 1:1 blend of ZnPc and C-60. Amongst the layered films, we find that the photocarrier efficiency increases as the individual layer thickness decreases, with the film having ultrathin alternating 2 nm thick layers exhibiting the strongest THz absorption. A much stronger THz absorption signal was obtained for the 2 nm layered film than for the best blend film.
Subject Keywords
Charge exchange
,
Fullerenes
,
Optical pumping
,
Organic semiconductors
,
Semiconductor superlattices
,
Semiconductor thin films
,
Solar cells
,
Terahertz spectroscopy
,
Vacuum deposition
,
Zinc compounds
URI
https://hdl.handle.net/11511/41313
DOI
https://doi.org/10.1109/pvsc.2010.5616508
Collections
Department of Chemistry, Conference / Seminar
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BibTeX
J. S. Melinger, P. Lane, O. Esentürk, and E. Heilweil, “PHOTO-CARRIER DYNAMICS OF BLENDED AND MULTI-LAYERED FILMS OF ZINC PHTHALOCYANINE AND C-60 MEASURED BY TIME-RESOLVED TERAHERTZ SPECTROSCOPY,” 2010, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/41313.