Study of gain phenomenon in lateral metal-semiconductor-metal detectors for indirect conversion medical imaging

Shiva Abbaszadeh; Nicholas Allec; Kai Wang; Feng Chen; Karim S. Karim

doi:10.1117/12.877860

16 March 2011 Study of gain phenomenon in lateral metal-semiconductor-metal detectors for indirect conversion medical imaging

Shiva Abbaszadeh, Nicholas Allec, Kai Wang, Feng Chen, Karim S. Karim

Author Affiliations +

Proceedings Volume 7961, Medical Imaging 2011: Physics of Medical Imaging; 79614P (2011) https://doi.org/10.1117/12.877860
Event: SPIE Medical Imaging, 2011, Lake Buena Vista (Orlando), Florida, United States

Abstract

Previously, metal-semiconductor-metal (MSM) lateral amorphous selenium (a-Se) detectors have been proposed for indirect detector medical imaging applications. These detectors have raised interest due to their high-speed and photogain. The gain measured from these devices was assumed to have been photoconductive gain; however the origin of this gain was not fully understood. In addition, whether or not there was any presence of photocurrent multiplication gain was not investigated. For integration-type applications photocurrent multiplication gain is desirable since the total collected charge can be greater than the total number of absorbed photons. In order to fully appreciate the value of MSM devices and their benefit for different applications, whether it is counting or integration applications, we need to investigate the responsible mechanisms of the observed response. In this paper, we systematically study, through experimental and theoretical means, the nature of the photoresponse and its responsible mechanisms. This study also exposes the possible means to increase the performance of the device and under what conditions it will be most beneficial.

Citation Download Citation

Shiva Abbaszadeh, Nicholas Allec, Kai Wang, Feng Chen, and Karim S. Karim "Study of gain phenomenon in lateral metal-semiconductor-metal detectors for indirect conversion medical imaging", Proc. SPIE 7961, Medical Imaging 2011: Physics of Medical Imaging, 79614P (16 March 2011); https://doi.org/10.1117/12.877860

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