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Subgap Absorption in Conjugated Polymers

Published online by Cambridge University Press:  21 February 2011

M. Sinclair ,
C. H. Seager ,
D. McBranch ,
A. J. Heeger  and
G. L. Baker
M. Sinclair
Affiliation:
Sandia National Laboratories, Albuquerque, NM
C. H. Seager
Affiliation:
Sandia National Laboratories, Albuquerque, NM
D. McBranch
Affiliation:
University of California, Santa Barbara, CA
A. J. Heeger
Affiliation:
University of California, Santa Barbara, CA
G. L. Baker
Affiliation:
Bell Communications Research, Red Bank, NJ
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Abstract

Along with χ(3), the magnitude of the optical absorption in thetransparent window below the principal absorption edge is an importantparameter which will ultimately determine the utility of conjugated polymersin active integrated optical devices. With an absorptance sensitivity of< 10-5, Photothermal Deflection Spectroscopy (PDS) is idealfor determining the absorption coefficients of thin films of “transparent”materials. We have used PDS to measure the optical absorption spectra of theconjugated polymers poly[1,4-phenylenevinylene] (and derivitives) andpolydiacetylene-4BCMU in the spectral region from 0.55 eV to 3 eV. Ourspectra show that the shape of the absorption edge varies considerably frompolymer to polymer, with polydiacetylene-4BCMU having the steepestabsorption edge. The minimum absorption coefficients measured variedsomewhat with sample age and quality, but were typically in the range 1 cm-1 to 10 cm-1. In the region below 1 eV,overtones of C-H stretching modes were observed, indicating that furtherimprovements in transparency in this spectral region might be achieved viadeuteration or fluorination.

Information

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 228: Symposium N – Materials for Optical Information Processing , 1991 , 79
Copyright
Copyright © Materials Research Society 1992

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References

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