Ultrathin Silicon Nanomembrane in a Tubular Geometry for Enhanced Photodetection

Changhao Xu, Ruobing Pan, Qinglei Guo, Xiang Wu, Gongjin Li, Gaoshan Huang, Zhenghua An, Xiuling Li, Yongfeng Mei

Research output: Contribution to journalArticle

Abstract

Advanced 3D mesostructures have prominent applications in flexible electronics, photonics, mechanics, and biomedicine. Here, 3D tubular silicon photodetectors are demonstrated by self-rolling ultrathin silicon nanomembranes with enhanced broadband photodetection and responsivity. Strain distributions within the unique circular structures are investigated with micro-Raman spectroscopy, while the tensile strain of the rolled-up microtubes can be controlled with the tube diameter by modifying the membrane thickness and etching parameters during the rolled-up process. The tubular photodetector exhibits increased photocurrent and suppressed dark current compared with planar devices over a wide incident angle. This study provides a novel approach to construct high-performance omnidirectional Si-based photodetectors and offers promising prospects for design and manufacture of complex 3D optoelectronic devices.

Original languageEnglish (US)
Article number1900823
JournalAdvanced Optical Materials
Volume7
Issue number21
DOIs
StatePublished - Nov 1 2019

Keywords

  • photodetector
  • rolled-up nanotechnology
  • silicon nanomembrane

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics

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