Tensile-strain-engineered electron–phonon coupling for high-performance n -MoS2/ p -Si photodetector

IF 3.8 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2026-09-28 DOI:10.1063/5.0333804

H. Naskath Sithara,E. Vinoth,R. Abimaheshwari,M. Navaneethan,J. Archana

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引用次数: 0

Abstract

Strain induced in multilayered molybdenum disulfide (MoS2) opens a new avenue for carrier dynamics, enabling the development of high-performance optoelectronic devices, including photodetectors. The strong electron–phonon coupling (EPC) can be effectively modulated through intercalation-induced strain engineering. Ion exchange between the intercalant and MoS2 leads to interlayer expansion and lattice distortion, providing an effective route to modulate strain. Hence, here, alkali ion (Mg2+) was initially intercalated in the precursor and subsequently grown on p-Si to n-MoS2/p-Si photodetector, facilitating efficient charge transfer. The redshift of E2g1 and A1g Raman modes in n-MoS2/p-Si indicated the presence of tensile strain, which weakens the EPC in the intercalated MoS2 layer. This strain-induced suppression of the EPC enhances the carrier mobility by approximately 2.6 times and reduces the carrier transit time to about one-fourth of that in the pristine structure. These synergic characteristics make n-MoS2/p-Si an excellent photodetector with fast response and good recovery of 0.9 s (photocyclability) over five cycles and good responsivity of 0.31 A/W. In addition to this, the external quantum efficiency of about 37% is observed for the fabricated photodetector.

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高性能n -MoS2/ p -Si光电探测器的拉伸-应变工程电子-声子耦合

多层二硫化钼（MoS2）的应变诱导为载流子动力学开辟了一条新的途径，使高性能光电器件（包括光电探测器）的发展成为可能。通过插层应变工程可以有效地调制强电子-声子耦合。插入剂和二硫化钼之间的离子交换导致层间膨胀和晶格畸变，为调制应变提供了有效途径。因此，在这里，碱离子（Mg2+）最初插入到前驱体中，随后在p-Si上生长到n-MoS2/p-Si光电探测器上，促进了有效的电荷转移。n-MoS2/p-Si中的E2g1和A1g拉曼模式红移表明存在拉伸应变，从而减弱了MoS2插层中的EPC。这种应变诱导的EPC抑制将载流子迁移率提高了约2.6倍，并将载流子迁移时间减少到原始结构的四分之一左右。这些协同特性使n-MoS2/p-Si成为一种优秀的光电探测器，具有快速响应和良好的恢复时间（5个循环0.9 s）和良好的响应率（0.31 A/W）。此外，所制备的光电探测器的外量子效率约为37%。

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.