energysurface

Photovoltaics

Posted on: November 17, 2010

•Photovoltaic Cells produce electricity when exposed to sunlight.
•This relies on the photoelectric effect
•Light can be thought of as being a stream of photons.
•A photon interacting with matter can give up it’s energy to promote an electron to a higher energy level.
•If the electron does not immediately return to its ground state then we can exploit it’s energy as an electric current.
•For efficiency we need
–A high probability of photon absorption
–A charge separation mechanism
–Electronic transportation to an external circuit where it’s electronic potential energy can be exploited
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