Ultrafast, self-powered and highly-stable PtS-Ga₂O₃ heterojunction photodetector for broad-spectrum sensing

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL Surfaces and Interfaces Pub Date : 2025-03-15 Epub Date: 2025-02-27 DOI:10.1016/j.surfin.2025.106125

Damanpreet Kaur , Rohit Dahiya , Vinit Sheokand, Gaurav Bassi, Mukesh Kumar

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Abstract

Noble metal chalcogenides (nMC), special class of 2D non-layered materials, are gaining traction due to their exceptional qualities like high carrier mobility and higher active sites at surface. From optoelectronics perspective, their unsaturated dangling bonds lead to higher photoresponse but at expense of prolonged carrier lifetime, thereby making devices slower. Platinum monosulfide (PtS) is one such nMC possessing great potential but currently plagued with slower switching times and stability issues. Herein, we report an ultra-fast and self-powered broadband photodetector of PtS by interfacing with amorphous Ga₂O₃ leading to microsecond response. Heterojunction devices show speeds of 84µs/100µs at self-bias (biasing reduces it further) and are stable even after 7500 h as opposed to bare PtS device, which shows neither. Interfacial band alignment explains working of device, thereby, revealing synergistic combination of nMC with wide-bandgap material, broadening the horizon of nMC-based self-powered optoelectronics.

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用于广谱传感的超快速，自供电和高度稳定的PtS-Ga₂O₃异质结光电探测器

贵金属硫族化合物（nMC）是一类特殊的二维非层状材料，由于其具有高载流子迁移率和高表面活性位点等特殊品质而受到关注。从光电子学的角度来看，它们的不饱和悬空键导致更高的光响应，但代价是延长载流子寿命，从而使器件变慢。单硫化铂（pt）就是这样一种具有巨大潜力的nMC，但目前受到切换时间较慢和稳定性问题的困扰。在此，我们报告了一种超高速自供电的宽带光电探测器，通过与非晶Ga2O3的界面导致微秒响应。异质结器件在自偏置下的速度为84µs/100µs（偏置进一步降低了速度），即使在7500 h后也很稳定，而裸PtS器件则两者都没有。界面带对准解释了器件的工作原理，从而揭示了nMC与宽带隙材料的协同结合，拓宽了基于nMC的自供电光电子学的视野。

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来源期刊

Surfaces and Interfaces Chemistry-General Chemistry

CiteScore

8.50

自引率

6.50%

发文量

753

审稿时长

35 days

期刊介绍： The aim of the journal is to provide a respectful outlet for ''sound science'' papers in all research areas on surfaces and interfaces. We define sound science papers as papers that describe new and well-executed research, but that do not necessarily provide brand new insights or are merely a description of research results. Surfaces and Interfaces publishes research papers in all fields of surface science which may not always find the right home on first submission to our Elsevier sister journals (Applied Surface, Surface and Coatings Technology, Thin Solid Films)