Coatings plastic substrates

Electrodeposition has been attempted also on flexible substrates within the scope of fabricating flexible solar cells. Huang et al. [177] investigated the electrodeposition of CIS on Au-coated plastic substrate from aqueous acidic (pH 1.65) solutions of millimolar CuCh, InCb, Se02, containing triethanolamine and sodium citrate. Stoichiometric, semiconductive CIS films (Eg = 1.18 eV) were obtained after annealing at 150 °C in nitrogen. 

Scherwsky et al. (1989) first utilized a SSFLC display in terms of the ferroelectric liquid crystalline polymer. The polymer SSFLC display is fabricated on the ITO-coated plastic substrate. The display was 15 x 40 cm2 in area and had 100 x 300 pixels (Lagerwell, 1993). The display doesn t need the orientation layer which is essential in the conventional liquid crystal displays in order to anchor the liquid crystal molecules. By lightly bending the... 

FIGURE 5.5.14 Optical micrographs of gold patterns printed by nTP. (a) 100-nm holes printed with a GaAs hard stamp on a plastic substrate coated with PDMS gold patterns printed with a PDMS stamp on (b) a PDMS substrate (c) a silicon/silicon dioxide substrate and (d) an ITO-coated plastic substrate. (From Y.-L. Loo, et al., J. Vac. Set TechnoL, B, 20, 2853, 2002.)... 

Figure 5.5.18 illustrates the ScL procedure used by Loo and coworkers to fabricate laminated pentacene TFTs. The top substrate, containing the [tCP-printed source and drain electrodes, was constructed on a PDMS-coated plastic substrate [89]. The bottom substrate was constructed on an ITO-coated plastic substrate. The ITO, patterned photo lithographically to define the gate level, was coated with an organosilesquioxane spin-on glass, which comprises the dielectric. Pentacene [44]... 

FIGURE 5.5.18 Schematic of soft-contact lamination, (a) Uniform layers of Ti ( 1 nm) and An (15-20 nm) are deposited onto a PDMS-coated plastic substrate, (b) Gold source and drain electrodes and interconnects are defined by microcontact printing, (c) This sheet is laminated against a bottom plastic substrate that contains the gate, dielectric and, semiconductor levels, (d) The completed laminated circuit. Insets magnified view of the laminated circuit and the side profile of a laminated electrode. (From Y.-L. Loo et al., Proc. Natl. Acad. Sci. U.S.A., 99, 10252, 2002.)... 

With the above liquid phase processible materials, we have made the first transistor in which all the essential components (electrodes, dielectric, and semiconductor) are printed (33). It has been demonstrated that hi performance transistors can be made by printing technique on a plastic substrate. These transistors (shown in Figure lb) consist of a polymer dielectric, a semiconducting regioregular poly(3-alkylthiophene), and two silver electrodes, and all of which have been printed on an ITO-coated plastic substrate. The performance of these transistors are comparable to those firom Si substrate and Si02 dielectric with lithographically defined Au electrodes (Figure 4). The field effect mobilities are in the order of 10 cm /Vs. 

On the other hand, the differences are highly interesting. An FLCP display is flexible, light-weight, and only 0.5 mm thick. It is made by spreading the polymer onto an ITO-coated plastic substrate, which is then laminated in a continuous process to a second substrate (see Fig. 113) using rollers, one of which in its bending action shear-... 

TABLE a-1 SOME REASONS FOR COATING PLASTIC SUBSTRATES... 

Under micro-discontinuous chromium coatings, copper undercoats improve corrosion resistance. On non-conductors, especially on plastic substrates, copper is often applied before nickel-chromium plating over the initial electroless copper or nickel deposit in order to improve ductility and adhesion, e.g. as tested by the standard thermal-cycling test methods ... 

Coating plastics, metals, etc. steps generally involve surface preparation, preheating substrate, powder applications, and post-heating. 

Test results show that thin coatings (2-5 mils) can significantly effect the fire performance of plastic substrates. Most EMI coatings decrease ignitability test results. Coatings tend to level diverse flame spread and ease of extinction performance. A 2-mil coating can reduce the 1, value in ASTM E162 Radiant... 

The anode material is, most typically, transparent ITO coated onto a glass or plastic substrate. Chapter 5 describes the details of such transparent anode materials. The general requirements for an anode material are as follows ... 

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