Resources: Photoconductive Infrared Detectors and Emitters - Technical Notes - Response Speed

To Determine System Frequency and Response Time

Both PbS and PbSe detector time constants increase (i.e., response speeds decrease) with a decrease in temperature (see figure below). By customizing deposition parameters, detectors with faster (decreased) time constants, at a given operating temperature, can be produced. A number of readily available PbS chemistries, characterized by their time constants at +23°C, are shown in the Figure below (e.g., PbS with a time constant of less than 100µsec at room temperature, is shown in the figure as PbS 100µsec).