Conjugated polymers have attracted great interest in electronic applications. The aim of the proposal is to use small angle neutron scattering to study the chain shape statistics of high mobility conjugated polymers with cutting-edge electronic performance. Chain shape information including the persistent length and characteristic ratio will tell about the stiffness of the polymer chain. It will provide basic information of these interesting polymers. The experimental result will also provide opportunities to find a link between chain stiffness and charge transport in these polymers.