Regio-random　(P1)　and-regular　(P2)　difluorobenzene-naphthalene-containing　polymer　acceptors　were　developed　for　bulk-hetero-junction　all-polymer　solar　cells　(all-PSCs).　P2　exhibited　significantly　higher　crystallinity　in　thin　films,　providing　high　spectral　absorptivity　and　electron　mobility　than　P1.　When　used　in　all-PSC　devices,　P2　afforded　a　respectably　higher　power　conversion　efficiency　of　over　5%.