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In essence, the potential energy of an electron is the distance the electron is from the reference energy to Ec, the lowest conduction band energy. The kinetic energy of an electron is the distance between Ec and the energy it is at. For holes, it's similar. A hole's potential energy is measured as being the distance between the reference energy and Ev, the highest valence band energy. The kinetic energy of a hole is measured by taking the difference between Ev and the energy the hole is at.
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