Asymmetric Electrode-Driven Self-Powered Photodetector Using Cu2-xS Film

IF 4.7 3区材料科学 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC

ACS Applied Electronic Materials Pub Date : 2025-09-26 DOI:10.1021/acsaelm.5c01539

Karthickraja Ramakrishnan, , , Y. Ashok Kumar Reddy, , and , B. Ajitha*,

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引用次数: 0

Abstract

Self-powered photodetectors through asymmetric contact modulation are a simple and efficient approach that has gained a lot of attention because they form an energy gradient in the band gap of the semiconductor. This energy gradient develops the self-assembly of the built-in electric field to separate the electron–hole pairs without any external bias, which facilitates long-term functioning of the device. Copper sulfide (Cu_2-xS) is a promising p-type semiconductor for visible-near-infrared photodetectors due to its tunable band gap and electrical properties. In this work, a Cu_2-xS-based metal–semiconductor–metal (MSM) photodetector with asymmetric electrodes (Au/Cu_2-xS/Ag) is fabricated, and its photodetector properties are measured under visible and near-infrared (NIR) light illuminations. The fabricated Au/Cu_2-xS/Ag structured device shows responsivity of 5.66 × 10^–3 A/W and 11.24 × 10^–3 A/W under visible (λ = 530 nm) and NIR (λ = 980 nm) light illuminations, respectively, even at zero bias. Finally, the obtained results attest that the fabricated self-powered photodetector is highly suitable for modern self-powered optoelectronic applications.

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基于Cu2-xS薄膜的非对称电极驱动自供电光电探测器

通过非对称接触调制的自供电光电探测器是一种简单而有效的方法，因为它们在半导体的带隙中形成能量梯度而受到了广泛的关注。这种能量梯度发展了内置电场的自组装，在没有任何外部偏置的情况下分离电子-空穴对，这有利于器件的长期运行。硫化铜（Cu2-xS）由于其可调谐的带隙和电学性质，是一种很有前途的用于可见光-近红外光电探测器的p型半导体。在这项工作中，制作了一个具有不对称电极（Au/Cu2-xS/Ag）的基于Cu2-xS的金属-半导体-金属（MSM）光电探测器，并在可见光和近红外（NIR）光照下测量了其光电探测器性能。制备的Au/Cu2-xS/Ag结构器件在可见光（λ = 530 nm）和近红外（λ = 980 nm）光照下的响应度分别为5.66 × 10-3 A/W和11.24 × 10-3 A/W，即使在零偏置下也是如此。实验结果表明，所制备的自供电光电探测器非常适合现代自供电光电应用。

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来源期刊

ACS Applied Electronic Materials Multiple-

CiteScore

7.20

自引率

4.30%

发文量

567

期刊介绍： ACS Applied Electronic Materials is an interdisciplinary journal publishing original research covering all aspects of electronic materials. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials science, engineering, optics, physics, and chemistry into important applications of electronic materials. Sample research topics that span the journal's scope are inorganic, organic, ionic and polymeric materials with properties that include conducting, semiconducting, superconducting, insulating, dielectric, magnetic, optoelectronic, piezoelectric, ferroelectric and thermoelectric. Indexed/Abstracted： Web of Science SCIE Scopus CAS INSPEC Portico