Organic Photovoltaic (OPV) technologies hold great promise for solar energy due to their improved conversion efficiency, low-cost and light weight.
An OPV cell is a photovoltaic cell that uses organic electronics—a branch of electronics that deals with conductive organic polymers or small organic molecules for light absorption and charge transportation. These polymers are formed by the chemical reactions of hydrocarbons.
These polymers are the important base of OPV and when these materials absorb a photon (sun light) an excited state is created. At this state an electron-hole pairs i.e. excitons are generated which are broken up by effective field caused due to hetrojunction (A hetrojunction is the interface that occurs between two layers or regions of dissimilar semiconductors).
(a) Schematic Diagram of OPV(www.nrel.gov) (b) Highly folded Hetrojunction of OPV
The building-integrated PV market may find OPV especially attractive because of the availability of absorbers in several different colors and the ability to make efficient transparent devices. In 2009, the total production of OPV is 5 MW with cell efficiencies of 6% for very small areas and below 4% for larger areas. Manufacturing technologies like-R2R techniques and standard printing reduce manufacturing costs to USD 0.6-0.7/W. It might be feasible to achieve costs below USD 0.5/Wp.
Er. Sheelam Khare..