The technology of dye sensitized solar cells is often referred to as artificial photosynthesis, analogous to chlorophyll in leaves, where a sensitized dye absorbs light and generates excited electrons. These electrons are injected into and transported via the conduction band of a high surface area semiconductor. These cells are thin film devices that use a nanocrystalline carrier layer made of titanium dioxide (TiO2) whose surface is chemically bonded with a monolayer of light-absorbing dye molecules. A small amount of gel electrolyte is used for the transport of the carriers.
The technology, developed by EPFL (Prof M. Grätzel), has been matured after 20 years of development and 17 licences distributed worldwide by EPFL. So far, stability of DSC were hindered by poor polymer sealing. Recently, we have been able to develop an industrial process for reliable glass sealing of DSC.
The company is actually working with newly acquired industrial equipment on scaling up the production of large size panels.