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Multiphysics-Coupled Strain Engineering in Flexible 3D-Graphene/Germanium Heterostructures for Broadband

Hui Ma1, Ailing Yin2, Genqiang Cao1

  • 1School of Physical Science and Technology, Ningbo University, Ningbo 315211, P. R. China.

Nano Letters
|April 17, 2026
PubMed
Summary

Researchers developed a flexible photodetector using a 3D-graphene/Germanium (Ge) heterostructure. This device offers a stable, wide-spectrum photoelectric response, even under bending, for advanced imaging and wearable applications.

Keywords:
Broadband photoresponseFlexible electronic devicesMultispectral imagingStrain modulationWearable applications

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Nanotechnology

Background:

  • Flexible photodetectors require robust materials with tunable responses under strain.
  • Germanium (Ge) shows promise for its broad absorption but its behavior in ultrathin flexible forms is not well understood.
  • Interfacial modulation mechanisms in flexible germanium photodetectors need further investigation.

Purpose of the Study:

  • To investigate the interfacial modulation and photoelectric properties of ultrathin flexible germanium.
  • To develop a stable and tunable flexible photodetector using a novel heterostructure.
  • To explore the potential of flexible germanium in advanced optoelectronic applications.

Main Methods:

  • Fabrication of a 3D-graphene/Ge heterostructure on flexible Ge thin films (∼15 μm thick).
  • Characterization of the photodetector's photoelectric response across a wide spectrum (380-1850 nm).
  • Evaluation of device stability under repeated bending cycles and dynamic deformation.

Main Results:

  • The flexible photodetector exhibited a stable response from 380 to 1850 nm.
  • Achieved high responsivity (80.2 A W⁻¹) and detectivity (1.2 × 10¹¹ jones) at 1850 nm.
  • Demonstrated low noise, rapid response times (164/161 μs), and stability over 10⁴ bending cycles.

Conclusions:

  • The 3D-graphene/Ge heterostructure enables high-performance flexible photodetectors with tunable responses.
  • The developed device maintains structural integrity and photoelectric stability under deformation.
  • Potential applications include multispectral imaging and wearable photoplethysmography monitoring.