Electrical, optical and structural properties, based on blend of PEDri 1-EFT:PC71BM bulk heterojunction solar cell is investigated. We have shown the presence of PC71BM in the blend facilitates interfaces for charge transfer mechanisms leading to PCEs of similar to 9.38%. GIXRD line profile obtained reveals that quantitative presence of PC71BM initiates a change in preferred orientation. It is proposed that PC71BM facilitates polymer alkyl side chain intercalations causing reduced d(100) spacing, leading to larger at-at stacking of the back bone. The data obtained from (Imo plane associated with PC71BM, reveals correlation between increased vertical stacking and PC71BM loading, suggesting a bicontinuous network for electron transport. Raman spectroscopy results provides evidence of PC71BM impact on frequency shift associated with pi = pi stretching mode of side chain thiophene rings responsible for of at-at spacing. Correlations between AFM surface roughness and blend ratio reveals migration of PC71BM to the film surface.