In an Operating Photovoltaic Cell, Electrons Move Through the External

question 39

Multiple Choice

In an operating photovoltaic cell, electrons move through the external circuit to the negatively charged p-type silicon wafer. How can the electrons move to the negatively charged silicon when they themselves are negatively charged? Don't like signs repel each other?

• A)This is a technological hurdle that has greatly inhibited the advancement of photovoltaic technology.
• B)An electric current is possible because the energy from the sun momentarily reverses the charge of the electrons, which are then called positrons (p-type).
• C)The p-type silicon wafer is actually positively charged.
• D)The energy of the sunlight knocks the electrons into a direction that they would otherwise not go.

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