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Photoelectric detectors based on binary transition metal chalcogenides have attracted widespread attention in recent years. However, due to the high-temperature synthesis of binary TMD, high-density deep-level defect states may be generated, leading to poor responsiveness or a long response time. Besides, the addition of an alloy will change the DLDSs from deep to shallow energy levels caused by S vacancies. In this paper, MoSSe nanostructures were synthesized by a hydrothermal method, and a novel type of photodetector was fabricated by using the synthesized material as a light sensitive material. The MoSSe-based photodetector not only has a high photocurrent, but also exhibits a wide spectral response in the range of 405 nm to 808 nm. At the same time, it can achieve a responsivity of 1.753 mA W under 660 nm laser irradiation of 1.75 mW mm. Therefore, this work can be considered as a method of constructing a new type of photodetector with a simple process and low cost.
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http://dx.doi.org/10.1039/d0na00202j | DOI Listing |
ACS Appl Mater Interfaces
September 2025
Department of Organic and Nano Engineering, and Human-Tech Convergence Program, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Republic of Korea.
Photomultiplication-type organic photodetectors (PM-type OPDs) have recently attracted attention. However, the development of polymer donors specifically tailored for this architecture has rarely been reported. In this study, we synthesized benzobisoxazole-based polymer donors incorporating alkylated π-spacers that simultaneously enhance photocurrent density () and suppress dark current density (), leading to high responsivity () and specific detectivity (*).
View Article and Find Full Text PDFAdv Mater
September 2025
College of Integrated Circuits & Micro-Nano Electronics, Fudan University, Shanghai, 200433, China.
High-operating-temperature (HOT) mid-wavelength and long-wavelength infrared photodetectors have emerged as critical enablers for eliminating bulky cryogenic cooling systems, offering transfromative potential in developing compact, energy-efficient infrared technologies with reduced size, weight, power, and cost. Focusing on infrared photodiodes, this review first discusses the fundamental mechanisms limiting performance at elevated operating temperatures. Subsequently, the progress in conventional epitaxial semiconductors, such as HgCdTe, InAsSb, and III-V type-II superlattice is reviewed, highlighting the evolution of device architectures designed to effectively suppress dark currents and approach background-limited performance.
View Article and Find Full Text PDFUsing Density Functional Theory (DFT) calculations, we explored the electronic band structure and contact type (Schottky and Ohmic) at the interface of VS-BGaX (X = S, Se) metal-semiconductor (MS) van der Waals heterostructures (vdWHs). The thermal and dynamical stabilities of the investigated systems were systematically validated using energy-strain analysis, molecular dynamics (AIMD) simulations, as well as binding energy and phonon spectrum calculations. After analyzing the band structure, VS-BGaX (X = S, Se) MS vdWHs metallic behavior with type-III band alignment is revealed.
View Article and Find Full Text PDFACS Appl Mater Interfaces
August 2025
Department of Physics, Research Centre of Excellence for Organic Electronics, Institute of Advanced Materials, Hong Kong Baptist University, 999077 Hong Kong, China.
Photomultiplication-type organic photodetectors (PM-OPDs) with dispersed electron or hole traps in a bulk heterojunction (BHJ) have external quantum efficiency far exceeding unity. However, it typically requires a very low donor-to-acceptor ratio, as excess donor or acceptor molecules in the BHJ lead to a high dark current by forming dense charge trap pathways, resulting in hopping conduction. The BHJ layer with a low donor-to-acceptor ratio often associates with a high operating voltage, limiting the use of the PM-OPDs.
View Article and Find Full Text PDFLangmuir
September 2025
Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing 100044, China.
Two-dimensional materials possess exceptional optoelectronic properties, including high carrier mobility and tunable bandgaps, making them highly suitable for various electronic and optoelectronic applications. While inorganic 2D materials exhibit ultrafast and efficient interlayer charge transport, they suffer from limited light absorption capabilities. In contrast, organic semiconductors offer broad spectral absorption but are constrained by their inherently low charge carrier mobility.
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