Internal Quantum Efficiency (IQE) and External Quantum Efficiency (EQE) measurements are indicators of the effectiveness of a photosensitive device such as those used in telecommunications and solar
cells. EQE is the ratio of the charges generated to the total amount of photons incident on the surface; a larger EQE indicates a more efficient device. IQE is the ratio of the charges generated to the number of
photons that hit the surface and are absorbed by the cell. Both EQE and IQE measurements are vital in the interrogation of light-responsive devices.1–3
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