Quantum Efficiency (QE) applies to incident photon to converted electron ( IPCE ) ratio of a photosensitive device. It is defined as the number of photon has been absorbed by the photosensitive device and has converted the number of electron-hole pair. Photosensitive devices include solar cells, Photo detectors, photodiodes, charge-couple device (CCD), CMOS, etc.
Since the energy of a photon is inversely proportional to its wavelength, QE is often measured over a range of different wavelengths to characterize a device’s efficiency at each photon energy level.
|Photo Detector / Photodiode|
|Image Sensor: CIS / CCD / CMOS|