Non-Interruptive Power Source- Integrated Photovoltaic-Battery
A multifunctional photovoltaic-battery (PVB) which represents a new-concept integrated PVB device as a novel power source for photoelectron conversion and energy storage within one single device.
The innovation enables a small-sized, lightweight and high-efficiency photovoltaic battery (PVB) with low environmental impact and low cost. It is an integrated harvest-and-store energy device that acts as a photovoltaic under light and a battery under dark conditions. It could be applied to several solar energy solutions and would allow for more compact portable devices.
PVB devices are attractive for photoelectron conversion and energy storage and, therefore, very promising for continuous power applications such as solar aircraft, solar vehicles and residential electrical applications.
How it works:
This novel type of PVB device is made from low-cost, non-toxic and earth abundant iron pyrite (FeS2) nanocrystals, otherwise known as "fool's gold". Iron is the fourth most abundant metallic element in the earth's crust and the cheapest to extract. In addition to its abundance, FeS2 has a remarkably high absorption coefficient level and ideal broad spectral light harvesting, making it a unique opportunity to incorporate a very thin absorber layer in solar cells to capture most of the incident solar radiation.
Why it is better:
The low photovoltage, sulfur deficiencies and poor structure uniformity of iron pyrite have severely limited its use in photovoltaic applications, despite its other superior features. Therefore, commercially viable iron pyrite PVB devices have not materialized in the marketplace. This discovery makes iron pyrite PVB devices possible.
This innovation is ideal for any application that requires a lightweight, low-cost, portable green-energy solution.