*2.1.1.1 Construction of a solar cell*

Although solar cells differ slightly in manufacture from standard p-n junction diodes, they are essentially the same thing. On top of the far more substantial n-type semiconductor, which serves as the base for the formation of the p-type semiconductor, an extremely thin layer is added (**Figure 2**). On top of the p-type semiconductor layer, we then place a few thinner electrodes.

When these electrodes are utilised, the p-type layer does not have its accessibility to light inhibited in any way. A p-n junction can be found just beneath the p-type layer in this structure. The underside of the n-type layer is likewise equipped with an electrode for collecting current. So that the solar cell is not damaged by accidental mechanical disturbance, we enclose the whole thing in a thin glass enclosure.
