Two-dimensional monoelemental germanene nanosheets: facile preparation and optoelectronic applications
Due to high carrier mobility, excellent stability and tunable optical properties, 2D monoelemental germanene has attracted great attention in recent years. Herein, few-layer 2D germanium nanosheets (GeNS) are obtained via a facile liquid-phase exfoliated method and fabricated as electrode materials to assemble self-powered photo-electrochemical (PEC) type photodetectors. Such 2D GeNS based PEC-type photodetector exhibits a responsivity of 7.81 µA/W, a detectivity of 5.2× 109 Jones, and rise and decay times of 0.15 s and 0.76 s under simulated light. At the specific wavelength of 380 nm, it demonstrates a responsivity of 340.91 μA W−1 and a detectivity of 1.82× 1011 jones. Additionally, GeNS based PEC-type device also exhibits good air-stability (over one-month). Present work demonstrates low-cost and facile fabrication techniques for preparing 2D monoelemental germanene and suggest as prepared GeNS is a promising candidate for PEC-type photodetectors application.
- This article is part of the themed collection: Journal of Materials Chemistry C HOT Papers