  Based on density functional simulations combined with the Landauer transport
theory, the mechanical strain impacts on the chemical bonds of phosphorene and
their effects on the electronic properties are studied. Moreover, the effect of
the tensile strain along the zigzag direction on the charge transport
properties of a two-terminal phosphorene device is evaluated. Enhancement of
the intraplanar interactions, in particular between the next-nearest neighbors
in strained phosphorene, is found to be essential in the band-structure
evolution. The charge transport analyzing shows that phosphorene has a strong
piezoconductance sensitivity, which makes this material highly desirable for
high-pressure nanoelectromechanical applications. The piezoconductance gauge
factor increases by strain from 46 in 5% tension to 220 in 12% tension, which
is comparable to state-of-the-art silicon strain sensors. The transmission
pathways monitor the current flowing in terms of the chemical bonds and
hopping, however, the transport mostly arises from the charge transferring
through the chemical bonds. The strong anisotropy in the transport properties
along zigzag and armchair directions is observed.
