Abstract
The fill factor (FF) is an important parameter and widely used in pixelated detectors, such as Silicon Photomultipliers (SiPMs), pixelated imagers, pixelated radiation detectors. FF is the ratio of photosensitive area to the total detector area. For the SiPMs, FF plays an important role in the photon detection efficiency (PDE). However, relatively few reports have focused on measuring the FF of SiPMs. This article describes a method to optically measure the effective FF of SiPMs based on our proposed criterion formula and the two-dimensional micro-spatial distribution of the avalanche pulse count rate of SiPM. The FFs of five different SiPMs were measured and analyzed using the developed method. Experimental results confirm that the effective FFs of SiPMs can be conveniently evaluated using the method proposed herein, which can provide reference for optimizing the design and manufacture of SiPMs. This method is also applicable for FF measurements involving other photon sensors.
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