  Tantalum diselenide (TaSe2) is an exciting material that hosts charge density
wave order (CDW) and superconductivity. Thus, providing a playing field for
examining the interactions of fundamental electronic quantum states in
materials. Recent research has proposed that the intrinsic quantum electronic
state in the TaSe2 lattice could be improved by aligning the Van Hove
singularity (VHs) with the Fermi level. In this study, we attempt to tune the
VHs in TaSe2 to align them within the vicinity of the Fermi level via electron
doping by chemically substituting Pt for Ta atoms. On investigating the band
structure of Pt0.2Ta0.8Se2, the electron doping brought the VHs closer to the
Fermi level vicinity around the K high symmetry point. As a result, the CDW
state in pristine TaSe2 is suppressed in the TaSe2 doped system while also
hosting an enhanced superconducting temperature (Tc) of ~2.7 K. These
observations provide insight into ways to leverage the VHs in materials to tune
their electronic properties.
