| Responsivity: S The electrical output for given IR input. where Y is the detector output and X is the radiation input. It is described as function of the wavelength S(A,) Series Resistance: Rs Parasitic resistance in photodiode. It's contribution to the total diode resistance may be significant to long wavelength and operating at near room temperatures especially for large area. Sheet Resistance The measure of the resistance of the very thin regions; expressed in ohm/square. It is used to normalize the resistance for devices with non-square active area. Shunt Resistance: Rsh The resistance of the photovoltaic detector biased with zero or with the very small voltage (e.g. ±10 mV), when not exposed to any radiation (dark state). Also referred to as dynamic impedance at zero bias. Spectral Response It is often understood as a spectral responsivity or a spectral detectivity. In detector data sheet it is presented as the D*(A,). It can be characterized by cut-off wavelength, optimum wavelength, peak wavelength. Voltage Responsivity: Voltage signal
Incident power Voltage responsivity is typically used to characterize photoconductors, photoelectromagnetic and in some cases photovoltaic devices. Voltage Responsivity - Width Product The voltage responsivity of PC detectors decreases with the width. Therefore the normalize voltage responsivity can be expressed as the Rv - w product. The voltage responsivity of PVM detectors decreases with the width similar as in PC devices. Therefore the normalize voltage responsivity can be expressed as the Ry - w product. |