Given the state-of-the-art in solar photovoltaic (PV) techlogy and favorable financing terms, it is clear that PV has already obtained grid parity in specific locations . Advances in the next generation of photovoltaic materials and photovoltaic devices can further reduce costs to enable all of humanity to utilize sustainable and renewable solar power . This Special Issue of Materials will cover such materials, including modeling, synthesis, and evaluation of new materials and their solar cells. Specifically, this Special Issue will focus on five material techlogies for advanced solar cells: 1. New Concepts in PV Materials: Nastructured materials, low-dimensional physics, multiple charge generation, up/down converters, thermophotovoltaics, low-cost III-V materials, bandgap engineering, hot-carrier effects, plasmonics, metamorphic materials, perovskite and related vel PV materials, vel light trapping, rectennas, quantum dots, carbon natubes, and graphene composites. 2. Organic PV Materials: Polymer, hybrid and dye sensitized solar cells, high performance contacts, and lifetime degradation and mechanisms. 3. Dye-Sensitized Solar Cells (DSSCs) Materials: Recent developments in dyes, working electrodes, techlogies for device fabrications, and advances in new electrolytes. 4. Amorphous, Nastructured, and Thin Film Silicon PV Materials: Microstructure characterization, light induced degradation (SWE), large area and high deposition rates, vel processing routes, light trapping, multi-layers, and multi-junction devices. 5. Passive Materials for all PV: Transparent conductive oxides (TCOs), encapsulation, connections, optics, glass, anti-reflection coatings (ARCs), alternative buffer layer materials, and contacts.