Two　new　indacenodithienothiophene-naphthalene　diimide　polymer　acceptorsPIN-1andPIN-2are　rationally　designed　by　two　side-chain　design　strategies　(SE-2andSE-3)　and　are　synthesized　by　the　direct　(hetero)arylation　polycondensation　(DHAP)　method.　Their　physicochemical　properties　are　investigated.　Both　polymers　have　similar　narrow　bandgaps　and　electron　energy　levels,　which　match　well　with　the　wide　bandgap　polymer　donor　PBZ-C6.　The　all-polymer　solar　cells　(all-PSCs)　based　on　the　optimized　PBZ-C6/PIN-1blend　and　the　PBZ-C6/PIN-2blend　display　power　conversion　efficiencies　of　5.81%　and　5.00%,　respectively.　The　results　indicate　thatSE-2andSE-3are　two　promising　side-chain　design　strategies　and　DHAP　is　an　alternative　method　for　obtaining　efficient　naphthalene　diimide　polymer　acceptors　for　all-PSCs.　©　The　Royal　Society　of　Chemistry　2021.