Thermal Solar Cells

A specially designed molecule that is capable of capturing and storing solar energy to release later as heat is the basis for some new technologies that are far more efficient than current commercial solar cells. The molecule, which is composed of carbon, hydrogen and nitrogen, is transformed into an energy-rich isomer when exposed to sunlight. It can then be stored in a liquid form for up to 18 years, before being triggered to release the energy as heat with the help of a catalyst.

In one application of the unique molecule, a closed system forms the basis for a domestic heating system. As energy is absorbed by collection panels, the liquid would be pumped to a storage tank until it is needed. When introduced to the catalyst, the liquid would heat up, be circulated throughout the building, and then be returned to collection panels to absorb more energy.

In another design, the molecule is incorporated into a window film. During the hottest parts of the day, it absorbs heat to keep temperatures cooler indoors. In this way, it reduces cooling costs by reducing load during peak hours. It then releases the heat for up to eight hours after the sun sets, distributing the energy more evenly over a longer period. The film could be used for buildings or vehicles.