Spin coating film thickness

Currem field characteristics measured wiih conjugated polymers sandwiched between an indium-tin oxide (ITO) anode and an aluminum cathode are usually hole dominated and are, consequently, appropriate for testing injection/lransport models for the case of unipolar current How. Data shown in Figure 12-1 refer to injection-limited currents recorded on typically 100 nm thick spin-coated films of derivatives of poly(y d/"fi-phenylenevinylene) (PPV) and a planarized poly(/ /" -pheny-leue) employing a Keilhley source measure unit. The polymers were ... 

FIG. 11.15 Intensity of the SH generated signal at saturation in function of the reluive intensities of the writing beams. Samples are spin-coated films of the DR I-MMA 35/65 copolymer with various thicknesses. Each experimental point is measured for an optimized value of the relative phase difference AO between the seeding beams. 

FIG. 11.16 Spatial profile (in the plane of the film) of the photoinduced second-order susceptibility X The sample vwis a 0.3 tm thick spin-coated film of the DRl-MMA 35/65 copofynoer.The polarization direction of the probe beam is identical to the polarization direction of the writing beams. The probe beam diameter was about 100 gm. This profile yields a full width at half height of about I mm, which is consistent with the diameters of the writing beams. 

TABLE 14.1 Surface modulation of SRGs produced at 488 nm with an intensity of 50 mW/cm under various poiaiization combinations on a 0.7 p,m thick spin-coated film of an epoxy-based polymer (CH-iA-CA). 

Film Spectroscopy. Each polymer (IX, X, XI) was dissolved in cyclohexanone at 3% by weight, and the sensitizer, 3,3 -carbonylbis(5,7-dipropyloxy coumarin) concentration was 3% by weight of the polymer. The three polymer solutions were each cast onto a quartz substrate via spin coating. The thickness of the films were adjusted until an optical density (O.D.) of between 2.0 and 3.0 was obtained at a wavelength of 300 nm. At this film thickness the concentration of the sensitizer was approximately 3xlO 3 M. Figure 3 shows the absorption characteristics of the non-... 

Example Determination of the Film Thickness of Spin-Coated Films... 

We present an XPS study of the interfaces P(VDF-TrFE)/Al and P(VDF-TrFE)/PEDOT PSS. As copolymer, we used P(VDF-TrFE) in a molar ratio of 70 30. The material was delivered as film from Piezotech SA, France. As solvent for spin coating, we used 2-butanone. We prepared different concentrations (as wt% P(VDF-TrFE) in 2-butanone) to investigate the dependence on layer thickness. After spin-coating at 6000 rpm, the film was annealed at 135 °C for 2 h to improve the crystallinity of the aXX-trans conformation, the so called P-phase [21]. The thickness of the spin-coated film was measured using a Taylor Hobson (Talystep) profilometer. 

Sandwich-type diodes were fabricated using 70 nm thick poly(3,4-ethylenedioxythiophene/poly(styrene-sulfonate) (PEDOT PSS) spin coated film on ITO glass as hole injection electrode. 300 nm C6o films were grown on top by... 

Determination of Optical Constants, Thickness and Density of the Spin-Coated Film.346... 

As discussed in Chapter 11, experimental results suggest that material properties of UTR films can differ in significant ways from their bulk counterparts. Of particular interest, because of its influence on the viscoelastic behavior of the spin-coated films, is the effect of film thickness on Eg (see Eig. 17.29), which decreases with film thickness for the particular substrate investigated in the study. 

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