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TitleSubgap Absorption in Conjugated Polymers
Author(s)Sinclair, M.; Seager, C. H.; McBranch, D.; Heeger, A. J; Baker, G. L.
Publication Date1991
Report NumberSAND-90-3023C
Unique IdentifierACC0471
Other NumbersCONF-910406--10; Legacy ID: DE91012655; OSTI ID: 5883862
Research OrgSandia National Laboratories, Albuquerque, NM (USA)
Contract NoAC04-76DP00789
Sponsoring OrgU.S. Department of Energy (DOE) Assistant Secretary for Defense Programs (DP), Washington, DC (USA)
Other InformationSpring meeting of the Materials Research Society (MRS), Anaheim, CA (USA), 29 Apr - 3 May 1991
Subject36 Materials Science; Polymers; Optical Properties; Absorption; Acetylene; Spectroscopy; Alkynes; Hydrocarbons; Organic Compounds; Physical Properties
Related Web PagesAlan J. Heeger, Conductive Polymers, and Plastic Solar Cells
AbstractAlong with X{sup (3)}, the magnitude of the optical absorption in the transparent window below the principal absorption edge is an important parameter which will ultimately determine the utility of conjugated polymers in active integrated optical devices. With an absorptance sensitivity of < 10{sup {minus}5}, Photothermal Deflection Spectroscopy (PDS) is ideal for determining the absorption coefficients of thin films of transparent'' materials. We have used PDS to measure the optical absorption spectra of the conjugated polymers poly(1,4-phenylene-vinylene) (and derivitives) and polydiacetylene-4BCMU in the spectral region from 0.55 eV to 3 eV. Our spectra show that the shape of the absorption edge varies considerably from polymer to polymer, with polydiacetylene-4BCMU having the steepest absorption edge. The minimum absorption coefficients measured varied somewhat with sample age and quality, but were typically in the range 1 cm{sup {minus}1} to 10 cm{sup {minus}1}. In the region below 1 eV, overtones of C-H stretching modes were observed, indicating that further improvements in transparency in this spectral region might be achieved via deuteration of fluorination.
723 K
13 pp.
 
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