Near-infrared self-powered RuS2xSe2−2x alloy photodetector via chemical vapor deposition RuSe2 and post-sulfurization process

IF 9.6 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Rare Metals Pub Date : 2025-03-21 DOI:10.1007/s12598-024-03152-3

Jaehyeok Kim, Hwi Yoon, Inkyu Sohn, Tatsuya Nakazawa, Sangyoon Lee, Donghyun Kim, Yusuke Ohshima, Hiroki Sato, Seunggi Seo, Sojeong Eom, Seung-Min Chung, Hyungjun Kim

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引用次数: 0

Abstract

Ruthenium (Ru)-based chalcogenide (S, Se) is a promising material in various fields, such as optics, photoelectrodes, and electrocatalysis, owing to its suitable bandgap for generating charge carriers under light illumination ranging from visible to near-infrared (NIR) and its high absorption coefficient. In this study, we report the synthesis of RuSe₂ thin films by chemical vapor deposition (CVD) with a bandgap matching the NIR region at 0.52 eV. Further, we demonstrated RuS_2xSe_2−2x alloy films using the post-sulfurization process after CVD RuSe₂ with a tunable bandgap from 0.52 to 1.39 eV depending on sulfur composition. Remarkably, RuS_2xSe_2−2x alloy film metal–semiconductor–metal (MSM) photodetector sulfurized at 500 °C, with a 0.75 eV bandgap, exhibits enhanced broad absorption across NIR spectral ranges, suppressed dark current and high photoresponsivity in NIR wavelengths range even at zero-bias. We believe the bandgap-tunable RuS_2xSe_2−2x thin film through an efficient deposition method could be suitable for various optoelectronic applications.

Graphical abstract

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采用化学气相沉积和后硫化工艺制备的近红外自供电RuS2xSe2 - 2x合金光电探测器

钌（Ru）基硫系化合物（S, Se）具有在可见光至近红外（NIR）光照下产生载流子的合适带隙和较高的吸收系数，在光学、光电极和电催化等领域具有广阔的应用前景。在这项研究中，我们报道了化学气相沉积（CVD）法制备了带隙与近红外区相匹配的0.52 eV的rus2薄膜。此外，我们还利用化学气相沉积后的后硫化工艺证明了RuS2xSe2 - 2x合金薄膜，其带隙根据硫的组成在0.52至1.39 eV之间可调。值得注意的是，在500°C下硫化的RuS2xSe2−2x合金薄膜金属-半导体-金属（MSM）光电探测器具有0.75 eV的带隙，在近红外光谱范围内具有增强的宽吸收，即使在零偏压下也能抑制暗电流，并且在近红外波长范围内具有较高的光响应性。我们相信，通过一种有效的沉积方法，带隙可调RuS2xSe2 - 2x薄膜可以适用于各种光电应用。图形抽象

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来源期刊

Rare Metals 工程技术-材料科学：综合

CiteScore

12.10

自引率

12.50%

发文量

2919

审稿时长

2.7 months

期刊介绍： Rare Metals is a monthly peer-reviewed journal published by the Nonferrous Metals Society of China. It serves as a platform for engineers and scientists to communicate and disseminate original research articles in the field of rare metals. The journal focuses on a wide range of topics including metallurgy, processing, and determination of rare metals. Additionally, it showcases the application of rare metals in advanced materials such as superconductors, semiconductors, composites, and ceramics.