In-Plane Bulk Photovoltaic Effect in a MoSe2/NbOI2 Heterojunction for Efficient Polarization-Sensitive Self-Powered Photodetection

IF 9.1 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY Nano Letters Pub Date : 2025-01-15 DOI:10.1021/acs.nanolett.4c05418

Xiong Huang, Qi Wang, Kejian Song, Qichuan Hu, Huaihao Zhang, Xingsen Gao, Mingzhu Long, Jinyou Xu, Zuxin Chen, Guofu Zhou, Bo Wu

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Abstract

Two-dimensional ferroelectric materials can generate a bulk photovoltaic effect, making them highly promising for self-powered photodetectors. However, their practical application is limited by a weak photoresponse due to a weak transition strength and wide band gap. In this study, we construct a van der Waals heterojunction using NbOI₂, which has significant in-plane polarization, with a highly absorbing MoSe₂ layer. We observe ultrafast hole transfer from MoSe₂ to NbOI₂ within 0.4 ps and electron transfer in the opposite direction within 3.8 ps, facilitating efficient charge dissociation and extraction. Applying a direct current electric field poling modulates the ferroelectric domains in NbOI₂, enhancing the bulk photovoltaic effect. This results in one of the highest responsivities for self-powered photodetectors (101.3 mA/W) at 0 V bias alongside excellent polarization sensitivity (∼7.58). This work advances the understanding of self-powering mechanisms via the bulk photovoltaic effect and proposes new strategies for future self-powered devices.

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MoSe2/NbOI2异质结的面内体光伏效应用于高效偏振敏感自供电光探测

二维铁电材料能产生体光效应，因此极有希望成为自供电光电探测器。然而，由于过渡强度弱和带隙宽，它们的实际应用受到光响应弱的限制。在本研究中，我们利用具有显著面内极化的 NbOI2 与高吸收 MoSe2 层构建了范德华异质结。我们在 0.4 ps 内观察到从 MoSe2 到 NbOI2 的超快空穴传输，在 3.8 ps 内观察到反方向的电子传输，从而促进了电荷的高效解离和提取。施加直流电场极化可调节 NbOI2 中的铁电畴，从而增强体光伏效应。因此，在 0 V 偏置下，自供电光电探测器的响应率最高（101.3 mA/W），同时具有出色的极化灵敏度（∼7.58）。这项工作加深了人们对通过体光伏效应实现自供电机制的理解，并为未来的自供电器件提出了新的策略。

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来源期刊

Nano Letters 工程技术-材料科学：综合

CiteScore

16.80

自引率

2.80%

发文量

1182

审稿时长

1.4 months

期刊介绍： Nano Letters serves as a dynamic platform for promptly disseminating original results in fundamental, applied, and emerging research across all facets of nanoscience and nanotechnology. A pivotal criterion for inclusion within Nano Letters is the convergence of at least two different areas or disciplines, ensuring a rich interdisciplinary scope. The journal is dedicated to fostering exploration in diverse areas, including: - Experimental and theoretical findings on physical, chemical, and biological phenomena at the nanoscale - Synthesis, characterization, and processing of organic, inorganic, polymer, and hybrid nanomaterials through physical, chemical, and biological methodologies - Modeling and simulation of synthetic, assembly, and interaction processes - Realization of integrated nanostructures and nano-engineered devices exhibiting advanced performance - Applications of nanoscale materials in living and environmental systems Nano Letters is committed to advancing and showcasing groundbreaking research that intersects various domains, fostering innovation and collaboration in the ever-evolving field of nanoscience and nanotechnology.