Engineering the p-SnO2/n-Si heterojunction with ultrafast response for broadband photodetection and imaging

IF 4.2 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Optical Materials Pub Date : 2025-10-01 DOI:10.1016/j.optmat.2025.117579

Xiaojun Yin , Li Zhou , Mingqi Yang , Xin Wang , Jinhua Su , Kaifeng Pan , Liang Tian , Xun Kang , Shusheng Pan

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Abstract

The p-type nitrogen-doped tin oxide (SnO₂:N) films were fabricated on n-Si wafers through a combined sputtering and thermal oxidation process. The optimized p-type SnO₂ films manifests a hole concentration of 6.27 × 10¹⁵ cm⁻³ and a mobility of 6.92 cm²/Vs. The p-SnO₂:N/n-Si photodetector achieves broadband response from ultraviolet to near-infrared light (255–1040 nm), with a responsivity of 1.17 A/W and detectivity of 3.3 × 10¹⁰ Jones at 740 nm (at 91.6 μW/cm²) under 5 V bias. The linear dynamic range reaches 56.27 dB. The high mobility of p-SnO₂:N films enable rapid separation of photogenerated carriers, yielding exceptional response speeds (13.84 μs rise/28.51 μs day). Remarkably, the devices maintain outstanding stability through 10⁴ operational cycles (>5 h). Single-pixel imaging across UV–Vis–NIR spectra has been successfully demonstrated.

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设计具有超快响应的p-SnO2/n-Si异质结，用于宽带光探测和成像

采用溅射和热氧化相结合的方法在N - si晶片上制备了p型氮掺杂氧化锡（SnO2:N）薄膜。优化后的p型SnO2薄膜空穴浓度为6.27 × 1015 cm−3，迁移率为6.92 cm2/Vs。p-SnO2:N/ N - si光电探测器实现了从紫外光到近红外光（255 ~ 1040 nm）的宽带响应，在5v偏置下，响应率为1.17 a /W，在740 nm （91.6 μW/cm2）处的探测率为3.3 × 1010 Jones。线性动态范围达56.27 dB。p-SnO2:N薄膜的高迁移率使得光生载流子能够快速分离，产生了优异的响应速度（上升13.84 μs /28.51 μs day）。值得注意的是，该器件在104个运行周期（>5 h）内保持出色的稳定性。单像素成像跨越紫外-可见-近红外光谱已成功证明。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Optical Materials 工程技术-材料科学：综合

CiteScore

6.60

自引率

12.80%

发文量

1265

审稿时长

38 days

期刊介绍： Optical Materials has an open access mirror journal Optical Materials: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. The purpose of Optical Materials is to provide a means of communication and technology transfer between researchers who are interested in materials for potential device applications. The journal publishes original papers and review articles on the design, synthesis, characterisation and applications of optical materials. OPTICAL MATERIALS focuses on: • Optical Properties of Material Systems; • The Materials Aspects of Optical Phenomena; • The Materials Aspects of Devices and Applications. Authors can submit separate research elements describing their data to Data in Brief and methods to Methods X.