纪文宇,张汉壮

• 1:吉林大学物理学院

摘要(Abstract)：

自从麦克斯韦第一次提出位移电流这一概念之后，其在薄膜表征中便得到广泛的应用。然而，在课堂教学中，极少涉及位移电流的测试原理及相关应用讲解，更缺少对其实际应用的介绍。本文从位移电流的测试原理出发，联系实际应用，提出了基于周期性阶跃电压驱动的电流测量(CPSIV)的新方法。这将有效地加深学生对于位移电流物理本质的深入理解。同时，我们以量子点发光二极管(QLED)为平台，对这一新的测试方案进行了实验验证。针对其中空穴传输层薄膜的缺陷特性及其对器件性能的影响进行了表征，揭示了器件的发光开启机制，证实了我们方案的可靠性。

关键词(KeyWords)： 麦克斯韦方程;位移电流;周期性阶跃电压;长寿命缺陷态;量子点发光二极管

Abstract:

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基金项目(Foundation):

作者(Author): 纪文宇,张汉壮

参考文献(References)：

• [1] 赵凯华，陈熙谋.电磁学[M].北京：高等教育出版社，2011.
• [2] MONTERO J M,BISQUERT J.Interpretation of trap-limited mobility in space-charge limited current in organic layers with exponential density of traps[J].J.Appl.Phys.,2011,110(04):3705-3710.
• [3] QIU X C,LIU Y,HU Y Y.Traps in metal halide perovskites:Characterization and passivation[J].Nanoscale,2020,12(44):22425-22451.
• [4] 刘恩科，朱秉升，罗晋生.半导体物理学[M].北京：电子工业出版社，2017.
• [5] WANG J P,GREENHAM N C.Charge transport in colloidal ZnO nanocrystal solids:The significance of surface states[J].Appl.Phys.Lett.,2014,104(19):1-5.
• [6] WANG Y C,ZHU X X,JI W Y,et al.Electron transport mechanism in colloidal SnO2 nanoparticle films and its implications for quantum-dot light-emitting diodes[J].J.Phys.D:Appl.Phys.,2022,55(37):4004.
• [7] LI L,PANDEY A,WERDER D J,et al.Efficient synthesis of highly luminescent copper indium sulfide-based core/shell nanocrystals with surprisingly long-lived emission[J].J.Am.Chem.Soc.,2011,133(5):1176-1179.
• [8] LI C,DUAN L,QIU Y,et al.Universal trap effect in carrier transport of disordered organic semiconductors:Transition from shallow trapping to deep trapping[J].J.Phys.Chem.C,2014,118(20):10651-10660.
• [9] LI H Y,LI C,DUAN L,et al.Charge transport in amorphous organic semiconductors:Effects of disorder,carrier density,traps,and scatters[J].Isr.J.Chem,2014,54(7):918-926.
• [10] NEAMEN D A.半导体物理与器件[M].4版.赵毅强，姚素英，史再峰，等.北京：电子工业出版社，2018.
• [11] NOGUCHI Y,ISHII H,KIM H J,et al.Device properties of Alq3-based organic light-emitting diodes studied by displacement current measurement[J].J.Photon.Energy,2012,2(1):021214.
• [12] ZHU X X,WANG Y C,JI W Y,et al.Unraveling the Turn-On Limitation of Quantum-Dot Electroluminescence via a Stepwise-Increasing Voltage Measurement[J].Phys.Rev.Appl.,2023,19(2):4010.
• [13] KWAK J,BAE W K,LEE D,et al.Bright and efficient full-color colloidal quantum dot light-emitting diodes using an inverted device structure[J].Nano Lett.,2012,12(5):2362-2366.
• [14] XU L,WANG J,HSU J W P.Transport effects on capacitance-frequency analysis for defect characterization in organic photovoltaic devices[J].Phys.Rev.Appl.,2016,6(6):4020.
• [15] WANG F F,HUA Q Z,JI W Y,et al.High-performance blue quantum-dot light-emitting diodes by alleviating electron trapping[J].Adv.Opt.Mater.,2022,10(13):2200319.