Hybrid　heterojunction　solar　cells　(HHSCs)　using　crystalline　Si　nanowires　(SiNWs)　as　the　absorber　and　conducting　polymer　poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)　(PEDOT:PSS)　as　the　hole-selective　transport　layer　(HTL)　show　great　potential　in　both　low-cost　and　high-power　conversion　efficiency　(PCE).　However,　due　to　the　poor　wettability　of　the　PEDOT:PSS　solution　on　SiNWs,　conformal　coverage　of　PEDOT:PSS　on　SiNWs　is　not　easy　to　achieve.　Here,　an　effective　method　was　developed　to　decrease　the　surface　tension　of　the　PEDOT:PSS　and　increase　the　wettability　between　PEDOT:PSS　and　SiNWs　by　incorporating　organosilane　into　the　PEDOT:PSS　solution.　Two　kinds　of　organosilanes　including　tetramethoxysilane　(TMOS)　and　vinyltrimethoxysilane　(VTMO)　were　selected　as　the　additives.　The　surface　passivation　quality　of　the　SiNWs　was　dramatically　enhanced.　The　HHSCs　utilizing　VTMO　as　the　additive　show　a　higher　open　circuit　voltage　and　higher　PCE　compared　with　the　TMOS　adding　ones.　By　spin-coating　Ag　nanowires　onto　the　PEDOT:PSS　HTL　layer　and　using　spin-coated　phenyl-C61-butyric　acid　methyl　ester　as　the　electron-selective　transport　layer,　a　champion　PCE　up　to　18.12%　and　a　fill　factor　of　80.1%　have　been　achieved　on　the　full　solution　processed　PEDOT:PSS/n-type　SiNWs　HHSCs.　The　findings　provide　a　simple　and　promising　method　to　achieve　high-performance　PEDOT:PSS/SiNWs　HHSCs.