Patent ID: 8552419

Claim:
A polymer comprising repeating units having the structure: wherein D 1 is a first donor segment; D 2 is a second donor segment, wherein D 2 at each occurrence is selected from the group consisting of triphenylamine, N,N-diphenyl-2-thiophenamine, 9-phenylcarbazole, 9-(2′-thiophene)-carbazole, 4-phenyldithienopyrrole, 4-(2′-thiophene)-dithienopyrrole, 6,12-diphenylindolocarbazole, tetraphenylbiphenyldiamine, and tetraphenylbenzenediamine; A 1 is an acceptor segment; B is a π-bridge moiety that conjugates D 2 to A 1 ; k is 1 or 2; and n is an integer from 2 to 2000.