Polysilane Thin Films for Electronic Devices

FIGURE 26. Structure of single-layer LEDs. (Reprinted from Ref. 93.) 

Polarized organic LEDs of the type ITO glass/photodegraded PMPS/ phthalocyanines/Al were prepared by using PMPS films exposed to polarized UV light.112 The device structure consisted of the hole injection ITO electrode, the hole transporting PMPS film, the emissive phthalocyanine layer, and the A1 electrode. The EL films of phthalocyanines deposited on PMPS surfaces from solution or vacuum evaporation showed oriented structures, which produced polarized EL. 

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Tacticity is required for the synthesis of crystalline thin polysilane films used for optical and semiconductor devices. Modern synthetic routes allow control over the conformation and tacticity of polysilane molecules used as precursors for thin layers of photoresists, photoconductors and nonlinear optical phases in complex semiconductor and (opto)electronic devices. These properties can be exploited only if the synthesis method ensures a minimal level of contamination, especially with oxygen and metals, and special care is taken to limit electronic-grade polysilanes to a level of contamination on the order of a few ppm in the case of oxygen and in the ppb range for metals. The reactivity of polysilane toward oxygen has forced placing the devices in a helium environment during measurement procedures.36... 

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