  In this paper, we propose a model in which a spectator field non-minimally
couples to an inflaton field and the power spectrum of the perturbation of the
spectator field at small scales is dramatically enhanced by the sharp feature
in the form of non-minimal coupling. At or after the end of inflation, the
perturbation of the spectator field is converted into curvature perturbation
and leads to the formation of primordial black holes (PBHs). Furthermore, for
example, we consider three phenomenological models for generating PBHs with
mass function peaked at $\sim10^{-12}M_\odot$ and representing all the cold
dark matter in our Universe and find that the scalar induced gravitational
waves generated by the curvature perturbation can be detected by the future
space-borne gravitational-wave detectors such as Taiji, TianQin and LISA.
