Ferroelectric Enhanced Performance of a GeSn/Ge Dual-Nanowire Photodetector

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

1 Scopus Citations
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Author(s)

  • Yuekun Yang
  • Xudong Wang
  • Chen Wang
  • Yuxin Song
  • Miao Zhang
  • Zhongying Xue
  • Shumin Wang
  • Zhongyunshen Zhu
  • Guanyu Liu
  • Panlin Li
  • Linxi Dong
  • Yongfeng Mei
  • Weida Hu
  • Jianlu Wang
  • Zengfeng Di

Detail(s)

Original languageEnglish
Pages (from-to)3872-3879
Journal / PublicationNano Letters
Volume20
Issue number5
Online published15 Apr 2020
Publication statusPublished - 13 May 2020

Abstract

GeSn offers a reduced bandgap than Ge and has been utilized in Si-based infrared photodetectors with an extended cutoff wavelength. However, the traditional GeSn/Ge heterostructure usually consists of defects like misfit dislocations due to the lattice mismatch issue. The defects with the large feature size of a photodetector fabricated on bulk GeSn/Ge heterostructures induce a considerable dark current. Here, we demonstrate a flexible GeSn/Ge dual-nanowire (NW) structure, in which the strain relaxation is achieved by the elastic deformation without introducing defects, and the feature dimension is naturally at the nanoscale. A photodetector with a low dark current can be built on a GeSn/Ge dual-NW, which exhibits an extended detection wavelength beyond 2 μm and enhanced responsivity compared to the Ge NW. Moreover, the dark current can be further suppressed by the depletion effect from the ferroelectric polymer side gate. Our work suggests the flexible GeSn/Ge dual-NW may open an avenue for Si-compatible optoelectronic circuits operating in the short-wavelength infrared range.

Research Area(s)

  • Ferroelectrical polymer, Germanium−tin, Molecular beam epitaxy (MBE), Nanowire, Photodetector, Side-gated

Citation Format(s)

Ferroelectric Enhanced Performance of a GeSn/Ge Dual-Nanowire Photodetector. / Yang, Yuekun; Wang, Xudong; Wang, Chen; Song, Yuxin; Zhang, Miao; Xue, Zhongying; Wang, Shumin; Zhu, Zhongyunshen; Liu, Guanyu; Li, Panlin; Dong, Linxi; Mei, Yongfeng; Chu, Paul K.; Hu, Weida; Wang, Jianlu; Di, Zengfeng.

In: Nano Letters, Vol. 20, No. 5, 13.05.2020, p. 3872-3879.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal