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Photoactivity represents the ability of a material, generally speaking a semiconductor, to become active when interacting with light. It can be declined in many ways, and several functionalities arising from this behavior of materials can be exploited, all leading to positive repercussions on our environment. There are several classes of effects of photoactivity, all of which have been deeply investigated in the last few decades, allowing to develop more and more efficient materials and devices. All of them share a common point, that is, the interaction of a material with light, although many different materials are taken into account depending on the effect desired—from elemental semiconductors like silicon, to more complex compounds like CdTe or GaAs, to metal oxides like TiO2 and ZnO. Given the broadness of the field, a huge number of works fall within this topic, and new areas of discovery are constantly explored. The special issue “Novel Photoactive Materials” has been proposed as a means to present recent developments in the field, and for this reason the articles included touch different aspects of photoactivity, from photocatalysis to photovoltaics to light emitting materials.

photo-oxidation --- silver phosphate --- low power white-light LED irradiation --- artificial rain --- density functional theory (DFT) --- degradation --- photocatalytic --- hybrid nanomaterials --- band gap modification --- photodeposition --- perovskite solar cell --- titanium oxide --- titanium(IV) oxo-clusters --- photo-oxidative degradation --- confocal microscope --- composite materials --- 4-chlorophenol --- anodizing --- broadband spectra --- photoactivity --- durability --- bio-based substances --- photo Fenton --- crystallinity --- nanostructured materials --- hydrothermal --- TiO2 --- advanced oxidation processes --- charge dynamics --- mechanical property --- CH3 --- metal-halides perovskites --- DFT calculations --- sol-gel --- caffeine --- CuxO-ZnO catalyst --- water-repellency --- photocatalysis --- stone protection --- surfactant --- photovoltaics --- photoluminescence --- hydrothermal synthesis --- UV ageing --- Fe/N-TiO2 --- visible-light --- rhodamine B --- alkylalkoxysilane --- electron transport material --- organometal --- magnetic materials --- titanium dioxide --- ZnO --- organic light emitting diodes (OLEDs) --- toluene --- TiO2 nanoparticles