Photocarrier response time scanner

Abstract

We have used the dependence of the response time after short laser pulses on background light intensity in hydrogenated microcrystalline silicon to study the properties of a two-dimensional image sensor application. A coplanar readout scheme has the advantage of a simple sample structure, however, the signal-to-noise ratio is acceptable only in the perpendicular readout of a p–i–n detector. The response time map reflects the change of both the resistivity and capacitance under varying local illumination. A camera speed of 10 frames per second with a 50 by 50 pixel resolution is reached on a 2 cm 2 detector.