This talk will describe recent results from UMass researchers at the PHaSE energy center in using organic molecular and polymer materials for solar energy (photovoltaic) uses. Organic polymers, molecular solids, nanoparticles, and nanocomposites with inorganic nanoparticles are under intense investigation for possible use in light to electricity (photovoltaic) conversion.  The organization of these materials is extremely important to give the best possible photoconversion efficiencies.  The past five years have seen solar cells based on one organic active layer improve from 2-5% power converstion efficiency to aboutt 10%. Recent results for both polymer and molecule-based solar cells will be described, with focus on the importance of trying different strategies to "tune" the morphology of the electronically active layer.