Electro-reflectance spectra

Figure 9. Electro-reflectance spectra of TS polymer Cupper curve and DCH polymer (lower curve recorded at 2 K with applied fields of about 23 KV/cm, after C74, ...

Fig. 9.21 Upper curve electro-reflectance spectrum of a PDA-DCH crystal at 8 K for light polarised parallel to the polymer chains. (Note the scale change at 2.3 eV.) Lower curve first derivative of the reflection spectrum. Reprinted with permission from Weiser (1992). Copyright 1992 by the American Physical Society.

The most striking results have been obtained for electro-reflectance from crystals of a polydiacetylene with carbazole pendent groups (PTS-DCH), Fig. 9.21, where the spectrum comprises a first derivative of the principal absorption and its sidebands and a signal characteristic of an inter-band... 

Both the visible and X-ray photoelectron spectra of the electro-deposited film indicated that the metal-ring structure of (EtO)ePcZn was maintained in the film. Before these spectral measurements, the film was kept at -0.5 V for 5 min in 0.1 M n-Bu4NC104/dichloromethane solution, for neutralization. Although the peak in the visible spectrum of the film obtained by reflection method was rather broad, the wavelength of the absorption maximum was almost identical to that of an (EtOaPcZn film... 

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