Construction and Multifunctional Photonic Applications of Light Absorption-Enhanced Silicon-Based Schottky Coupled Structures

Huijuan Wu, Shanshui Lian, Jinqiu Zhang, Bingkun Wang, Wenjun Bai, Guqiao Ding, Siwei Yang, Zhiduo Liu, Li Zheng*, Caichao Ye*, Gang Wang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

To expand the detection capabilities of silicon (Si)-based photodetector and address key scientific challenges such as low light absorption efficiency and short carrier lifetime in Si-based graphene photodetector. This work introduces a novel Si-based Schottky coupled structure by in situ growth of 3D-graphene and molybdenum disulfide quantum dots (MoS2 QDs) on Si substrates using chemical vapor deposition (CVD) and plasma-enhanced chemical vapor deposition (PECVD) techniques. The findings validate the “dual-enhanced absorption” effect, enhancing the understanding of the mechanisms that improve optoelectronic performance. The synergistic effect of 3D-graphene's natural nano-resonant cavity and MoS2 QDs enhances light absorption efficiency and extends carrier lifetime. Introducing MoS2 QDs broadens and intensifies the built-in electric field, promoting the separation of photogenerated electrons and holes. The photodetector exhibits a wideband light response in the wavelength range of 380–2200 nm. It stably outputs photocurrent under high-frequency (1 kHz) modulated laser (2200 nm), with a responsivity (R) of 40 mA W−1 and detectivity (D*) of 1.15 × 109 Jones. Photodetectors show the ability to process and encrypt complex binary signals and achieve versatility in “AND” gate and “OR” gate logic operations, as well as image sensing (240 × 200 pixels).

Original languageEnglish
JournalSmall
DOIs
Publication statusAccepted/In press - 2024

Keywords

  • Schottky heterojunction
  • broadband photodetector
  • imaging sensors
  • information encryption
  • logic circuit

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Wu, H., Lian, S., Zhang, J., Wang, B., Bai, W., Ding, G., Yang, S., Liu, Z., Zheng, L., Ye, C., & Wang, G. (Accepted/In press). Construction and Multifunctional Photonic Applications of Light Absorption-Enhanced Silicon-Based Schottky Coupled Structures. Small. https://doi.org/10.1002/smll.202406164