CsPbBr3 perovskite quantum dots/p-GaN heterojunction for ultraviolet-visible spectrum photodetectors

IF 3.5 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2024-11-13 DOI:10.1063/5.0238223

Yushen Liu, Bingjie Ye, Yang Gao, Xifeng Yang, Mingfa Peng, Guofeng Yang

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引用次数: 0

Abstract

All-inorganic perovskites have attracted increasing attention because of their strong environmental stability and excellent photoelectric properties. However, the limited spectral response range of perovskite photodetectors restricts them in practical applications. In this work, an ultraviolet–visible photodetector with a wide spectral response and a high responsivity was prepared by constructing a CsPbBr3 quantum dots (QDs)/p-GaN heterojunction. The type-II energy band alignment formed by the heterojunction is conducive to the transport of photogenerated carriers, resulting in a high responsivity. Under certain conditions, the device can obtain responsivity values of 5 A/W and 850 mA/W under 350 and 725 nm illumination, respectively, which are comparable to those of other perovskite-based photodetectors. In addition, the photoresponse mechanism of the device is revealed through first-principles calculations of the heterojunction and the device. The enhanced light absorption of the heterojunction and the special band bending under different bias voltages improve the photoelectric performance of the device. This work can provide valuable insights into high-performance photodetectors based on all-inorganic perovskite QDs heterojunctions in terms of band regulation and device performance improvement.

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用于紫外-可见光谱光电探测器的 CsPbBr3 包晶量子点/p-GaN 异质结

全无机包晶石具有很强的环境稳定性和出色的光电特性，因此受到越来越多的关注。然而，包晶石光电探测器有限的光谱响应范围限制了其实际应用。在这项工作中，通过构建 CsPbBr3 量子点（QDs）/p-GaN 异质结，制备了一种具有宽光谱响应和高响应率的紫外-可见光光电探测器。异质结形成的 II 型能带排列有利于光生载流子的传输，从而实现了高响应率。在特定条件下，该器件可在 350 纳米和 725 纳米光照下分别获得 5 A/W 和 850 mA/W 的响应值，与其他基于包晶石的光电探测器相当。此外，通过对异质结和器件的第一性原理计算，揭示了该器件的光响应机制。异质结的光吸收增强和不同偏置电压下的特殊带弯曲改善了该器件的光电性能。这项工作可为基于全无机包晶 QDs 异质结的高性能光电探测器在能带调节和器件性能改善方面提供有价值的见解。

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.