The urgent need to limit the continuous reliance on fossil fuels, which still play a key role in the global share of total energy supply, has boosted the request and the research for clean and renewable energy sources. Sustainable alternatives are needed because carbon-based fuels, when burnt, release to the atmosphere a great amount of CO2, which represents the major cause of air pollution and greenhouse gas effect, ultimately resulting in severe environmental events. Utilisation of the Sun’s radiation as source of energy can effectively limit these risks. However, to be a primary energy supply, solar energy must be captured, converted, and stored to overcome its intrinsic intermittency.