Partially and fully fluorinated alkyl substituted thienothiophene monomers
(and polymers thereof) wherein the monomers are represented by the
formula: ##STR00001## wherein R is a partially or fully fluorinated
primary, secondary or tertiary alkyl having from 1 to 8 carbon atoms; and
X and X' are independently selected from the group consisting of H, F,
Cl, Br, I, MgCl, ##STR00002## --COR'', --C.ident.CH, and a
polymerizable cyclic pi-conjugated carbon-ring structure optionally
comprising S, N or O heteroatoms; wherein R' is a primary, secondary or
tertiary alkyl having from 1 to 6 carbon atoms, and R'' is H or a
primary, or tertiary alkyl having from 1 to 6 carbon atoms.