基于甲脒碘化铅量子点的超宽带光电探测器

IF 4.4 2区 物理与天体物理 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Che-Wei Chang , Yu-Hung Chen , Yu-Cheng Zhang , Kuan-Yu Ke , Kasimayan Uma , Zong-Liang Tseng
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引用次数: 0

摘要

通过将甲脒碘化铅(FAPbI3)量子点(QDs)作为光收集层,制备出了近红外光电探测器。通过对器件结构进行系统优化,利用 PCBM 作为电子传输材料和 50 纳米厚的 TAPC 薄膜作为空穴传输层,实现了高器件性能。PCBM 和 FAPbI3 QD 之间的能级对准实现了高效的激子解离和空穴阻断,而优化的 TAPC 厚度则减少了电流泄漏途径。由此产生的光电探测器在 750 纳米波长下表现出 59.56% 的惊人外部量子效率,以及 2.63 x 1011 琼斯的高比探测率。在 300-900 纳米波长范围内观察到宽带光响应,以及 30.58/31.26 μs 上升/下降时间的快速时间响应。在 780 纳米光照下,实现了 61.5 分贝的大幅线性动态范围。此外,通过合理选择材料和厚度而实现的低暗电流密度也有助于实现出色的整体器件性能。PCBM/FAPbI3 QDs/TAPC 系统的器件性能证明了其在要求高灵敏度、高速度和宽光谱响应的近红外光电应用中的巨大潜力,为进一步推动光电探测及其他相关器件技术的发展提供了机遇。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Ultra-broadband Photodetectors Based on Formamidinium Lead Iodide Quantum Dots

Near-infrared photodetectors were fabricated by incorporating formamidinium lead iodide (FAPbI3) quantum dots (QDs) as the light-harvesting layer. Through systematic optimization of the device architecture, high device performance was achieved by utilizing PCBM as the electron transport material and a 50 nm-thick TAPC film as the hole transport layer. The energy level alignment between PCBM and the FAPbI3 QDs enabled efficient exciton dissociation and hole blocking, while the optimized TAPC thickness decrease current leakage pathways. The resulting photodetectors exhibited an impressive external quantum efficiency of 59.56 % at 750 nm, along with a high specific detectivity of 2.63 x 1011 Jones. A broadband photoresponse from 300–900 nm was observed, as well as a fast temporal response with 30.58/31.26 μs rise/fall times. A substantial linear dynamic range of 61.5 dB was achieved under 780 nm illumination. Furthermore, the low dark current densities facilitated by the judiciously selected materials and thicknesses contributed to the excellent overall device performance. The device performance of the PCBM/FAPbI3 QDs/TAPC system demonstrate its promising potential for near-infrared optoelectronic applications requiring high sensitivity, speed, and broad spectral response, opening up opportunities for further advances in photodetection as well as other relevant device technologies.

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来源期刊
Results in Physics
Results in Physics MATERIALS SCIENCE, MULTIDISCIPLINARYPHYSIC-PHYSICS, MULTIDISCIPLINARY
CiteScore
8.70
自引率
9.40%
发文量
754
审稿时长
50 days
期刊介绍: Results in Physics is an open access journal offering authors the opportunity to publish in all fundamental and interdisciplinary areas of physics, materials science, and applied physics. Papers of a theoretical, computational, and experimental nature are all welcome. Results in Physics accepts papers that are scientifically sound, technically correct and provide valuable new knowledge to the physics community. Topics such as three-dimensional flow and magnetohydrodynamics are not within the scope of Results in Physics. Results in Physics welcomes three types of papers: 1. Full research papers 2. Microarticles: very short papers, no longer than two pages. They may consist of a single, but well-described piece of information, such as: - Data and/or a plot plus a description - Description of a new method or instrumentation - Negative results - Concept or design study 3. Letters to the Editor: Letters discussing a recent article published in Results in Physics are welcome. These are objective, constructive, or educational critiques of papers published in Results in Physics. Accepted letters will be sent to the author of the original paper for a response. Each letter and response is published together. Letters should be received within 8 weeks of the article''s publication. They should not exceed 750 words of text and 10 references.
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