PV Gap

Ana Said:

in a solar cell, do electrons flow through a circuit from the electron rich or electron poor semiconductor?

We Answered:

A solar cell is made of a semiconductor. If you look at some versions of a Periodic Table of elements the semiconductors are identified with a different color. Semiconductors let their outer shell electrons go when just a little energy is applied. Notice that silicon is in this group, silicon is what the majority of today's solar cells are made of. The first time the solar effect was noticed selenium was used, notice it too is in the semiconductor grouping. Also in this semiconductor grouping is boron, in the column to the left of silicon, and phosphorus, to the right of silicon. Just a little bit of these two elements are put into the silicon of the solar cell to make intentional holes and extras so that electrons will flow.

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