Carbon-phosphide monolayer with high carrier mobility and perceptible: I - V response for superior gas sensing
Artikel i vetenskaplig tidskrift, 2020

Monolayered carbon phosphide (CP), with semi-metallic electrical conductivity and graphene-like Dirac cone responses, has attracted significant attention from the advanced nanoelectronics community, for use in gas sensing devices. The CP monolayer exhibits semi-metallic behavior in the x-direction and semi-conducting behavior in the y-direction. With the presence of graphene-like Dirac cones, it holds highly anisotropic carrier mobility characteristics. Here, we introduce the first-principle theoretical calculations for understanding the adsorption mechanism of different gas molecules-CO, CO2, NH3, NO and NO2-on the monolayer for electronic sensing devices. The binding strengths of these gas molecules adsorbed on the CP layer are much stronger than for other reported two-dimensional materials, such as graphene, blue phosphorene, germanene, etc. Additionally, the charge transfer analysis also supported an enhanced binding strength due to the sufficient amount of charge sharing between the CP monolayer and gas molecules. We further present an extensive study about the transport properties of CP monolayer sensor devices with electrodes made out of identical materials. The transmission characteristics, the density of states, and I-V response are supported by analysis of the charge distribution of the CP monolayer upon adsorption of CO, CO2, NH3, NO and NO2. Molecules have been calculated using density functional theory and non-equilibrium Green's function. The presented theoretical investigations reveal that the CP monolayer-based device exhibits improved characteristics and could be the foundation towards constructing highly sensitive nanosensor devices.

Författare

Deobrat Singh

Uppsala universitet

Vivekanand Shukla

Chalmers, Mikroteknologi och nanovetenskap (MC2), Elektronikmaterial och system

Pritam Kumar Panda

Uppsala universitet

Yogendra Kumar Mishra

Syddansk Universitet

Horst Günter Rubahn

Syddansk Universitet

Rajeev Ahuja

Uppsala universitet

Kungliga Tekniska Högskolan (KTH)

New Journal of Chemistry

1144-0546 (ISSN) 1369-9261 (eISSN)

Vol. 44 9 3777-3785

Ämneskategorier

Materialkemi

Annan kemi

Den kondenserade materiens fysik

DOI

10.1039/c9nj06447h

Mer information

Senast uppdaterat

2020-04-08