Study on the Distribution Range of Measurable Trap Depth Using Space Charge Measurement Method

The measurement speed and spatial resolution are two key performances of space charge measurement methods, whose effect on measurable charge trap depth has never been discussed before. Based on the hopping model of space charge in the sample, a judgment criteria is proposed to analyze the accurate measurement of space charge information. Further calculation example indicates that, the measurable charge is in the trap depth range above 0.85 eV when single measurement time needs 1 s and spatial resolution is 10 $\mu$m in the PEA method. The studied sample characteristic and temperature can also affect the trap depth range. Meanwhile, the proposed criteria is also proper for the analyzation of other space charge measurement methods.