Research On Radiation Dose Rate Effect On The Performance Of Cmos Image Sensor

Unlike the past, current CMOS Image Sensors are becoming competitive withregard to Charged Couple Device (CCD) technology. CMOS Image Sensors areincreasingly applied to space tasks due to all of its advantages. But the extreme spaceradiation environment can do great damage to those CMOS Image Sensors in spacetasks. In the wake of that, lots of researches have been carried out, focusing on theradiation effect on CMOS Image Sensors by conducting experiments. But in thoseexperiments, researchers usually accelerate the process by choosing a dose rate muchhigher than the real space situation. But it has never been discussed that does theexperiments on earth leads to the same results as those devices used in space.In this dissertation, both total dose effect and dose rate effect are taken intoaccount to analysis the radiation effect on the performance of CMOS Image Sensors.And the main achievements are as following aspects:The principles of choosing dose rate in radiation experiments are discussed, andthe importance of dose rate effect has been stressed. By analyzing the interactingbetween the radiation particles and the main parts of the devices, a few mathematicalmodels are built to reflect the regulations between working parameters and the doserate.An experiment was carried out to further the research on large dose rate situationof CMOS Image Sensors. And the radiation source is high-energy electrons. Byanalyzing the experiment results and the statistics from published references, theregular patterns of dose rate effect on dark current as well as the light responsivity ofCMOS Image Sensors are concluded, so as an empirical formula.A new experimental method is proposed to improve the present way of radiationand dose rate effects on CMOS Image Sensors, which can help to save much time andmoney. The innovation of this dissertation is the suggestion to bring dose rate effectsinto research on radiation effects of CMOS Image Sensors, and conductinginterrelated research. This will provide a new way for the future study of CMOSImage Sensors.