I think you must be more specific. Electromagnetic spectrum of the sun contains all the radiations (radio, microwave, infra-red, visible, UV, X-ray, gamma,...) ...

But if I understand well your question,

inherently conductive polymers are promising candidates to absorb solar energy.

Are you interested in polymers for solar thermal applications? If so i would say looking at engineering grade plastics would be your best bet. Apart from that Microcapillary films of low density polyethylene have heat transfer performance similar to metal based micro scale heat exchangers. Perhaps looking into carbon black fillers would be of use as well.