Space charge-induced capacitance recovery in blue quantum dot light-emitting diodes

IF 3.5 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2024-09-10 DOI:10.1063/5.0226752

Xiangwei Qu, Jingrui Ma, Depeng Li, Kai Wang, Xiao Wei Sun

引用次数: 0

Abstract

In this work, we report the capacitance recovery behavior in the blue quantum dot light-emitting diode (QLED) by capacitance–voltage (C–V) characterizations. A comprehensive study of the C–V, dC/dV–V, and current density–voltage characteristics of pristine and shelf-aged devices suggests that capacitance recovery is associated with space charge-induced charge accumulation. At lower temperatures, the capacitance recovery in the shelf-aged device is efficiently suppressed due to the difficulty in building up the space charge, which supports our argument. Moreover, the capacitance recovery behavior of QLED only happens at low frequencies (a few hundred hertz), which is related to the time constant for charge accumulation at the selected voltage. Our work shows the effect of space charge on device capacitance and enriches the comprehension of carrier processes in QLED under AC measurement.

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蓝色量子点发光二极管中的空间电荷诱导电容恢复

在这项工作中，我们通过电容-电压（C-V）特性分析，报告了蓝色量子点发光二极管（QLED）的电容恢复行为。对原始器件和搁置老化器件的 C-V、dC/dV-V 和电流密度-电压特性的综合研究表明，电容恢复与空间电荷引起的电荷积累有关。在较低温度下，由于难以积累空间电荷，搁置老化器件中的电容恢复被有效抑制，这支持了我们的论点。此外，QLED 的电容恢复行为只发生在低频（几百赫兹），这与所选电压下电荷积累的时间常数有关。我们的研究表明了空间电荷对器件电容的影响，并丰富了对交流测量条件下 QLED 中载流子过程的理解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

期刊介绍： Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology. In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics. APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field. Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.