In the light of growing energy needs, depleting fossil fuels, and the threatening global warming, alternative energy sources are needed. Chalcopyrite materials are suitable for renewable energy applications, for example solar cells, water splitting or photo catalysis. In our study, we synthesize copper indium disulfide films via
a solvothermal procedure. The nanostructured films are crystalline even at temperatures below 200 °C as shown by electron microscopic techniques.