IMPROVEMENT AND APPLICATIONS OF DISPLACEMENT CURRENT MEASUREMENTS
Since Maxwell first proposed the concept of displacement current,it has been wide-ly used in thin film characterization.However,in classroom teaching,the testing principles and related applications of displacement current are seldom covered,and its practical applica-tions are even more lacking.In this paper,a new method through current measurement by a periodic stepwise-increased voltage(CPSIV)is proposed from the testing principles of dis-placement current,in connection with practical applications.This will effectively expand students'in-depth understanding of the physical nature of displacement current.Meanwhile,we experimentally validated this new testing scheme using quantum dot light-emitting diodes(QLEDs)as a platform.The defect properties of its hole transport layer film and its effect on the device performance were characterized,revealing the luminescence turn-on mechanism of the device.All the above results confirm the reliability of our scheme.
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