Figure 2 - Typical solar cells.

From the following article

Organic photovoltaics: Polymer power

Vishal Shrotriya

Nature Photonics 3, 447 - 449 (2009)


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a, Polymer bulk-heterojunction. The bottom transparent substrate can be glass or flexible plastic, the bottom contact is a transparent conducting oxide (TCO) with a high work function, the active layer is a mixture of donor and acceptor molecules, and the top electrode is a metal with a low work function, such as aluminium. b, Translucent polymer. The substrate is either glass or flexible plastic and the transparent cathode (bottom electrode) is made from a TCO coated with n-type interfacial film. The active layer is very thin donor–acceptor bulk-heterojunction film. For the anode (top electrode) a thin p-type interfacial layer is used and capped with very thin transparent conductive film, such as gold or a TCO.