A conjugated polymer zwitterion includes repeating units having structure (I), (II), or a combination thereof ##STR00001## wherein Ar is independently at each occurrence a divalent substituted or unsubstituted C.sub.3-30 arylene or heteroarylene group; L is independently at each occurrence a divalent C.sub.1-16 alkylene group, C.sub.6-30 arylene or heteroarylene group, or alkylene oxide group; and R.sup.1 is independently at each occurrence a zwitterion. A polymer solar cell including the conjugated polymer zwitterion is also disclosed.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH & DEVELOPMENT
 This invention was made with government support under award number DE-SC0001087 awarded by the U.S. Department of Energy (DOE), Office of Basic Energy Sciences. The government has certain rights in the invention.