One of the most attractive and challenging field in Inorganic Chemistry,Polysilane has wide application.

1. ADVANCED APPLICATION OF
POLYSILANES

2. POLYSILANES
 High molecular weight polymer with silicon in their
backbone
 Differ from inorganic polymers like polysiloxane and
polyphosphazene .
 The exclusive Si-Si bond allows sigma
delocalization
 Electrical and Optical properties and other
Siloxanes
Polyphosphazene Polysilanes

3. • Solubility can be tuned with varying
attached group
• Thermal Resistant upto 573 K
• Sigma electron delocalization along the Si-
Si chain
• Low Sigma-sigma* excitation
• The bond can be broken by UV light
Properties of Interest

4. APPLICATION HISTORY
 First Synthesized in 1920
 No application till 1970
 Yajima et al formation of polydimethysilane to
Silicon Carbide
 Discovery of electronic properties by west et al
 Two fold:
 Application based on the reactivity
 Aplication based on the electrical properties

5. APPLICATIONS BASED ON THE REACTIVITY
OF POLYSILANES
Precursor to Silicon Carbide
• Prolysis of a mixture of Polysilanes and
Polycarbosilanes at 1670 K
• Silicon Carbide uses-
 Structural Material
 Automobile Parts
 Heating Material
 Steel Production

6. PHOTOINITIATOR IN RADICAL REACTION
 Homolytic Cleavage on exposure to UV light
form free silyl radical
 Can react with olefinic monomer to initiate
free radical Polymerization
 Polymerization of styrene and several
acrylate polymers

7. APPLICATIONS BASED ON THE PHOTOPHYSICAL
AND ELECTRONIC
PROPERTIES OF POLYSILANES
 Hole transporting materials
 In electronic devices, such as organic light emitting
diodes (OLEDs) and organic photovoltaics (OPV).

8. APPLICATION BASED ON ELECTRICAL
PROPERTIES
 Polysilanes in OLEDs
 Polysilanes can be employed as hole transporting
materials or emitters in OLED
 The basic design of a polymer OLED is
devices, more specifically
in polymer OLEDs.
• OLED in Display and other
Electronic devices.

9. POLYSILANES AS PHOTOVOLTAIC
 Polysilane in Photo voltaic
 Polysilanes can be part of the active layer
or, such as in multi-layered OLEDs,
 serve as a hole transporting hole
transporting material
in organic solar.

10. OTHER AREAS
 Fabrication of Microlens Arrays
 Coatings
 Polysilanes as Photoresists in Microelectronics
 And more……

11. CONCLUSION
 Application of Polysilanes are numerous
 Commercialization has not happened
 Some reason:
difficulties in
 controlling their synthesis with regard to molecular
weight, PDI and impurities as
 well as the high costs of these elaborate methods
and the purification processes involved.

12. REFERENCES
 A. Rahimi, Iran. Polym. J., 13, 149 (2004).
 A. Rahimi and P. Shokrolahi, Int. J. Inorgan. Mater.,
3, 843 (2001).
 J. E. Sheats, Jr., Ch. E. Carraher, Jr., Ch. U.
Pittmann, and M. Zeldin, Macromol.
 K. Matyjaszewski, Polym. Mater. Sci. Eng., 64, 104
(1991).
 Book Inorganic Chemistry by James E Mark and
Harry E Allock
 Modern Synthetic and Application Aspects
of Polysilanes: An Underestimated Class
of Materials? A. Feigl, A. Bockholt, J. Weis