Here,　conjugated　polymer　is　added　as　third　component　to　tune　the　solution　viscosity,　morphology,　and　function　of　small　molecule　(SM)　based　bulk-hetero-junction　(BHJ)　solar　cells,　which　are　fabricated　using　blade　coating.　Novel　information　about　the　effect　of　blade　coating　speed　on　the　nanoscale　morphology　and　function　of　ternary　blend　solar　cells　is　provided.　The　crystal　sizes　increase　with　an　increase　of　coating　speed　for　both　binary　and　ternary　blends,　while　the　addition　of　the　third　component　tends　to　favor　smaller　SM　crystal　grains　and　improves　the　connectivity　of　SM　crystals.　Small　angle　neutron　scattering　experiments　provide　the　first　clear　experimental　evidence　that　the　addition　of　the　third　component　would　significantly　impact　the　fullerene　phase　separation,　which　is　crucial　for　bimolecular　recombination　and　charge　transport.　It　shows　that　for　both　binary　and　ternary　blends,　the　concentration　and　sizes　of　[6,6]-phenyl-C61-butyric　acid　methyl　ester　(PCBM)　aggregates　increase　with　an　increase　of　coating　speed,　while　addition　of　third　component　does　not　affect　the　volume　fraction　of　PCBM　aggregates　but　impacts　the　size　of　PCBM　aggregates.　It　is　demonstrated　that　the　judicious　selection　of　blade　coating　speed　and　addition　of　conjugated　polymer　optimize　the　morphology　of　SM-BHJ,　providing　guidelines　for　high　performance　SM-BHJs　from　roll-to-roll　production.