Polypyrrole, an organic polymer absorbs radar waves. So if Polypyrrole is pasted on surface of aircraft, it can act as a stealth one. Also, flexible organic solar cell can be used to form on top surface of plane for power generation.
When considering a coating for any application it is necessary to consider some other factors along with its natural properties. With reference to your particular application, I would ask the following questions - 1) What are the mechanical, physical, chemical, corrosion and thermal properties of the polymer? Can it withstand the range of thermal and mechanical fatigue encountered by the aircraft at the various altitudes of flight?
2) What would be the application parameters which would make the coating more viable and are those range of values for the parameters suitable for the aircraft? The parameters include- mode of coating application, adhesion of the coating, thickness of the coating required, surface preparation required of the aircraft (and if the surface preparation affects the properties of the base material itself), frequency of coating inspection that will be required, aging time of the polymer.
As for the solar cell - again, one should consider its physical properties and mechanical properties. Also, it should be seen where exactly on the aircraft it will be positioned, if it will lead to an increase in the weight of the aircraft, among other factors.
The most important thing is the economic feasibility of both the ideas.
If you are really interested in this topic, I believe, this will require a detailed review, and may lead to an entire PhD just to prove its feasibility.
Hope that helped.
apart from that Polypyrrole is the worst one could imagine for such an application, it requires more than only 1 PhD work of time just to prove its feasability. I have worked for 35 years with condutive polymers and you can read in my original articles and in review articles / handbook chapters what properties are useful, which limitations these conductive polymers have, which applications are reasonable and what to consider when trying to implement them.
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