Fabrication, structural characterization, optical properties, and temperature-dependent fluorescence of CdTe tetrapods

Thuy Thi Pham; Thi Kim Chi Tran

doi:10.15625/0868-3166/24331

Author affiliations

Authors

Pham Thi Thuy Saigon University, 273 An Duong Vuong, Cho Quan Ward, Ho Chi Minh City, Vietnam https://orcid.org/0000-0001-9553-7975
Tran Thi Kim Chi chool of Electrical and Electronic Engineering, Hanoi University of Industry, 298 Cau Dien, Tay Tuu, Hanoi, Vietnam

DOI:

https://doi.org/10.15625/0868-3166/24331

Keywords:

tetrapods, CdTe, optical property, temperature dependence

Abstract

CdTe tetrapod nanocrystals (NCs) were synthesized using a colloidal hot-injection method, and their structural, vibrational, and optical properties were systematically investigated. X-ray diffraction and transmission electron microscopy analyses confirmed the formation of tetrapod-shaped NCs with a zinc-blende (ZB) crystal structure. Raman scattering measurements revealed clear phonon features associated with longitudinal optical and surface optical modes, indicating the presence of phonon confinement effects in the NCs. Optical absorption and photoluminescence spectra exhibited two distinct features attributed to excitonic transitions in the tetrapod core and arms. Temperature-dependent photoluminescence measurements demonstrated significant variations in emission energy, intensity, and linewidth with increasing temperature, which are mainly governed by band-gap shrinkage and exciton--phonon interactions. The experimental results were analyzed using well-established theoretical models, providing insight into the thermal stability and carrier recombination processes in CdTe tetrapod NCs. These findings contribute to a better understanding of the optical behavior of branched semiconductor nanostructures and their potential applications in optoelectronic devices.

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