Object StatementSolar module, organic photovoltaic, PET / indium tin oxide / specialised polymers / silver, made by CSIRO Materials Science and Engineering, Clayton, Victoria, Australia, 2010
Physical DescriptionSolar module, organic photovoltaic, PET / indium tin oxide / specialised polymers / silver, made by CSIRO Materials Science and Engineering, Clayton, Victoria, Australia, 2010
Solar module with substrate comprising inert PET (polyethylene terephthalate) with a clear layer of indium tin oxide applied to it to form the anode. Specialised polymers have been printed onto the substrate in three red strips of varying width. Along each side of, and partially covering, each polymer strip is a strip of silver, which forms the cathode. A white insulating material (perhaps titanium dioxide) is deposited along the outer side of each silver strip. The red strips are built up in layers. The first layer is an insulating polymer with many tiny holes in it. The next two layers, which sit inside these holes, are: a conducting polymer; and a light-harvesting electron-donor red dye and a light-harvesting electron-donor semiconducting polymer intimately mixed with an electron-accepting buckminsterfullerene derivative, forming a bulk heterojunction material with large interfacial surface area. The top layer is a protective polymer coating. When light strikes the semiconducting polymer, electron-hole pairs form within it. The bulk heterojunction structure allows the electrons to move rapidly to the fullerene and then to the cathode, while the holes move to the anode. If the module is connected in a circuit, this movement of electrons and holes causes an electric current to flow.
MarksHand-written in black ink on a clear part of the module, 'Indan'.