Concepts/Description a. Discuss the difference between internal quantum efficiency and external quantum efficiency of a LED. b. Describe...

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Physics

Concepts/Description
a. Discuss the difference between internal quantum efficiencyand external quantum efficiency of a LED.
b. Describe the operation of a photodiode

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External Quantum Efficiency EQE is the ratio of the number of charge carriers collected by the solar cell to the number of photons of a given energy shining on the solar cell from outsideincident photons Internal Quantum Efficiency IQE is the ratio of the number of charge carriers collected by the solar cell to the number of photons of a given energy that shine on the solar cell from outside and are absorbed by the cell The IQE is always larger than the EQE A low IQE indicates that the active layer of the solar cell is unable to make good use of the photons To measure the IQE one first measures the EQE of the solar device then measures its transmission and See Answer

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