  Defects are inevitably present in two-dimensional (2D) materials and usually
govern their various properties. Here a comprehensive density functional
theory-based investigation of 7 kinds of point defects in a recently produced
{\gamma} allotrope of 2D phosphorus carbide ({\gamma}-PC) is conducted. The
defects, such as antisites, single C or P, and double C and P and C and C
vacancies, are found to be stable in {\gamma}-PC, while the Stone-Wales defect
is not presented in {\gamma}-PC due to its transition metal
dichalcogenides-like structure. The formation energies, stability, and surface
density of the considered defect species as well as their influence on the
electronic structure of {\gamma}-PC is systematically identified. The formation
of point defects in {\gamma}-PC is found to be less energetically favourable
then in graphene, phosphorene, and MoS2. Meanwhile, defects can significantly
modulate the electronic structure of {\gamma}-PC by inducing hole/electron
doping. The predicted scanning tunneling microscopy images suggest that most of
the point defects are easy to distinguish from each other and that they can be
easily recognized in experiments.
