Two-dimensional (2D) inorganic halide
nanomaterials are
finding
tremendous attention owing to ease of synthesis, solution processability,
superior electronic, optical, and mechanical properties resulting
in versatile applications. All inorganic dual phase perovskite composites
can have superior optoelectronic properties than a single phase one.
In addition to dual phase, doping with various ions may open up new
avenues for emerging applications of such materials. In this work,
we report on the synthesis of colloidal 2D Mo-doped all inorganic
dual phase mix halide perovskite (CsPbBr3/CsPb2Br5). The charge carrier dynamics in these nanostructures
has been studied with femtosecond transient absorption technique.
Our studies reveal that at low pump fluences cold carrier trapping
predominantly affects relaxation dynamics at early time. However,
Auger recombination of excitons dominates the early time carrier relaxation
at high fluences. Additionally, femtosecond Z-scan
studies have been performed to elucidate the effect of photoinduced
charge carriers on two photon absorption (TPA) properties of Mo-doped
2D perovskite. Our results could be useful for designing new low-dimensional
perovskites for future linear and nonlinear optoelectronic applications.