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内容記述 |
For radiation detection, a solar cell device has been introduced as a self-powered dosimeter that outputs a radiation-induced current signal without requiring an external voltage but using a built-in potential. As CuInGaSe (CIGS) solar cells have very high radiation tolerance, they likely allow to detect radiation stably over long periods in a high-dose environment. However, the radiation detection characteristics of CIGS solar cells should be further clarified. We focus on the current response of CIGS solar cells in a gamma-ray environment and characterize the dosimeter behavior. In addition, we propose a method to construct a photodetector that leverages the characteristics of solar cells, and another method to enhance the device durability using radiation degradation prediction based on the formulation for space solar cells. The CIGS solar cell device exhibits stable operation without degradation even in a Co-60 gamma-ray environment of 1 MGy, and its detection characteristics allow measuring dose rates from 100 mGy/h to 100 kGy/h with an approximate resolution of 10 mGy/h with a fast response of approximately 2 ms. We derive radiation detection characteristics of CIGS solar cells from their high external quantum efficiency and high parallel resistance. Overall, we found that conventional solar cell technologies may enable the development of high-performance dosimeters. |
