Device structure and operational mechanism

The solubility and/or fusibility of these polymers allow the formation of thin films of optical quality they also allow the formation of complex morphologies due to phase separation and supramolecular organization [29, 30], 

It is easy to tailor their optical properties by modifying the polythiophenes (PTs) via simple substitution on the main chain, at least for bandgaps varying from 1 to 3 eV [31, 32], The chemical control of bandgaps is not easily achieved for the poly(/ -phenylenevinylene) (PPV) [33] or poly(p-phenylene) (PPP) [34] systems that represent two of the other processable polymer families. 

The enhanced photochemical stability of PTs compared with PPVs and PPPs make them more attractive for photoconversion. Still, the photochemical stability is limited by photochemistry in the presence of oxygen, water or chemical species remaining after synthesis [21-26, 35]. 

5-Dibromo-3-[2-(3,5-dimethoxy-4-octyloxyphenyl)vinyl]thiophene (P3DMOPVT) 6 1.86 1.45 46 

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