  Phase engineering strategies in two-dimensional transition metal
dichalcogenides (2D-TMDs) have garnered significant attention due to their
potential applications in electronics, optoelectronics, and energy storage.
Various methods, including direct synthesis, pressure control, and chemical
doping, have been employed to manipulate structural transitions in 2D-TMDs.
Metal intercalation emerges as an effective technique to modulate phase
transition dynamics by inserting external atoms or ions between the layers of
2D-TMDs, altering their electronic structure and physical properties. Here, we
investigate the significant structural phase transitions in Pb(Ta1+xSe2)2
single crystals induced by Ta intercalation using a combination of Raman
spectroscopy and first-principles calculations. The results highlight the
pivotal role of Ta atoms in driving these transitions and elucidate the
interplay between intercalation, phase transitions, and resulting electronic
and vibrational properties in 2D-TMDs. By focusing on Pb(Ta1+xSe2)2 as an ideal
case study and investigating like metal intercalation, this study advances
understanding in the field and paves the way for the development of novel
applications for 2D-TMDs, offering insights into the potential of these
materials for future technological advancements.
