cigs ultrahigh and ultrafast broadband optical position sensitive detector

Abstract

The invention discloses a CIGS ultra-high and ultra-fast wide-waveband light position sensitive detector, and belongs to the technical field of position detectors. The CIGS ultra-high and ultra-fast wide-waveband light position sensitive detector comprises a photoresponse film layer, a first electrode and a second electrode, wherein the photoresponse film layer grows on a glass substrate; the first electrode and the second electrode are arranged on the photoresponse film layer and connected with a voltmeter or an oscilloscope in series by virtue of a wire; the photoresponse film layer comprises a metal back electrode Mo layer, a CIGS light absorption layer, a CdS transition layer, a ZnO window layer and an ITO transparent conductive layer which are sequentially arranged on the glass substrate; and the first electrode and the second electrode are arranged on the ITO transparent conductive layer. According to the position detector, the effects of a wide-waveband fast response and an ultrahigh signal can be achieved and the sensitivity is high.

Description

technical field [0001] The invention belongs to the technical field of position detectors, and relates to optical position sensitive detectors, in particular to CIGS ultra-high and ultra-fast broadband optical position sensitive detectors. effect, high sensitivity. Background technique [0002] When a point light source illuminates a PN junction, a semiconductor heterojunction or a metal-semiconductor junction, due to the difference in carrier concentration between the illuminated area and the non-illuminated area, the voltage value can be measured by using two electrodes drawn from the same surface of the junction. One effect is called the lateral photovoltaic effect. As the point light source moves between the two electrodes, the voltage difference has a linear relationship with the position of the point light source. This feature makes the lateral photovoltaic effect widely used in position-sensitive detectors. [0003] The photoelectric detection position detector has...

AI Technical Summary

Problems solved by technology

However, the current position-sensitive detectors based on the lateral photovoltaic effect generally have the problem of low sensitivity. Although the sensitivity can be greatly improved by adding bias voltage modulation, this method also has a big drawback, that is, in the high-power laser Under illumination, the linearity becomes extremely poor, in other words, the voltage difference no longer exhibits a linear relationship with the illumination position

This phenomenon greatly limits the detection range and detection accuracy of such detectors

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