The effects of interface layer PEDOT:PSS/PTB7:PC₇₀BM of silver nanoparticl es on phase separation of photosensitive laye r PTB7:PC₇₀BM are analyzed by the contact angle measurement,atomic force microscope(AFM) and X-ray photoelectron spectroscopy(XPS) charact eriza tion along with performance parameters of the related solar cell.The results in dicate that introducing silver nanoparticles at the interface of PEDOT:PSS/PTB7: PC ₇₀BM would not change the surface morphology of the photosensitive layer,b ut optimize the phase separation of the photosensitive layer,which is essentiall y attributed to the change of surface energy of PEDOT:PSS,mainly resulting from e thanol solvent.This study shows that for silver nanoparticles integrated organi c solar cells,we not only need to consider the optical effects induced by silver nanoparticles,such as localized plasmonic effect and light scattering,but also need to consider the electrical effects due to the changes of phase separation of the photosensitive layer.