concentration is about 0 1 or less and wherein the initiator is a nickel ii complex preferably the ratio is about 50 1 or less wherein the first molar concentration is about 0 1 or less wherein the initiator is a nickel ii diphosphinohalogen complex wherein the alkyl group comprises 4 to 12 carbons and wherein the polymerizing is carried out at a temperature of about 10 u00b0 c to about 40 u00b0 c another embodiment is a method comprising polymerizing 3 alkylthiophene monomer by grignard metathesis polymerization at a first molar concentration m 0 in the presence of an organometallic polymerization initiator at a second molar concentration i under conditions to form regioregular poly 3 alkylthiophene wherein the polymerization is carried out under conditions which provides a degree of polymerization which can be predicted based on the first and second molar concentrations this can be followed by chain extension preferably the alkyl group comprises 4 to 18 carbons or alternatively 4 to 12 carbons preferably the polymerizing is carried out at a temperature of about 0 u00b0 c to about 50 u00b0 c preferably the ratio m 0 i is about 136 1 or less preferably the first molar concentration is about 1 m or less preferably the initiator is a nickel ii complex preferably the polymerizing provides regioregular poly 3 alkylthiophene preferably the polymerizing provides regioregular poly 3 alkylthiophene wherein the initiator is a nickel ii diphosphinohalogen complex wherein the ratio m 0 i is about 80 1 or less and wherein the first molar concentration is about 0 5 m or less preferably the polymerizing provides regioregular poly 3 alkylthiophene wherein the alkyl group comprises 4 to 12 carbons wherein the polymerizing is carried out at a temperature of.