What is Quantum Efficiency Fill Factor (QEFF) of a SWIR sensor?

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- GoPhotonics

Mar 20, 2023

Quantum Efficiency Fill Factor (QEFF) is a combination of quantum efficiency (QE) and fill factor (FF), which are the key parameters that determine the efficiency of the Short-Wave Infrared (SWIR) sensor that is used to detect light in the near-infrared spectrum. By converting more light into electrical energy and using more of the electrical energy generated, these two parameters play a crucial role in improving the performance of SWIR sensors. The QEFF is expressed in terms of percentage (%).

Quantum Efficiency

Quantum Efficiency is an important parameter of any sensor that measures the extent to which it efficiently converts incoming photons into electrical signals. In the case of a Short-Wave Infrared sensor, the quantum efficiency is determined by the semiconductor material used in the sensor and the wavelength of the incident photons. It is defined as the ratio of the number of electrons generated in the sensor to the number of photons incident on the sensor. A high QE indicates that more light is converted into an electrical signal, leading to higher sensitivity and better performance of the sensor.

Quantum efficiency is expressed as a percentage and can range from 0 to 100. The higher the quantum efficiency, the more efficient the sensor is at converting light into electrical energy. 

Fill Factor

Fill Factor is a measure of the degree to which a SWIR sensor converts the electrical energy generated into usable power. It is defined as the measure of the effective area of sensor that is sensitive to light. Fill factor is also defined as the ratio of the active area of the sensor to the total area of the sensor. A high fill factor indicates that more area of the sensor is sensitive to light, leading to a higher signal-to-noise ratio and better image quality. Fill factor is expressed as a decimal value and can range from 0 to 1.