Semiconductor nanocrystals have been demonstrated for use in solar cells for many years, however their efficiency is limited. Recently, perovskite solar cells using nanocrystals have achieved admirable performance metrics, but still lag behind thin-film crystalline and polycrystalline materials. Here we will formulate new perovskite nanomaterials using reduced lead alloyed and lead-free materials to create efficient, non-toxic and less toxic solar cells. Seminconductor nanocrystals will be synthesized by the student, purified and characterized, and we will then fabricate working solar cells and electrically characterize these cells to achieve optimum performance. The goal is to link physical, chemical and optical material properties to device performance, thus creating a route to push perovskite NC solar cells to compete with thin films.