Gallium Phosphide Solar Cell Structures with Improved Quantum Efficiencies

Siao, Hui-Ying; Bunk, Ryan; Woodall, J. M.

doi:10.1007/s11664-019-07848-6

Cited by 4 publications

(1 citation statement)

References 17 publications

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“…The combination of materials with different elastic constants creates an enhancement of phonon wave interference effects such as phonon bandgaps . Both GaAs and GaP are highly relevant materials in the realm of photonic and optoelectronic devices with applications in photovoltaics, − light-emitting devices, transistors, etc. The possibility of combining these two materials at the nanoscale will create a versatile material system for photonic and phononic applications.…”

Section: Introductionmentioning

confidence: 99%

GaAs/GaP Superlattice Nanowires for Tailoring Phononic Properties at the Nanoscale: Implications for Thermal Engineering

K. Sivan,

Abad,

Albrigi

et al. 2023

ACS Appl. Nano Mater.

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The possibility to tune the functional properties of nanomaterials is key to their technological applications. Superlattices, i.e., periodic repetitions of two or more materials in one or more dimensions, are being explored for their potential as materials with tailor-made properties. Meanwhile, nanowires offer a myriad of possibilities to engineer systems at the nanoscale, as well as to combine materials that cannot be put together in conventional heterostructures due to the lattice mismatch. In this work, we investigate GaAs/GaP superlattices embedded in GaP nanowires and demonstrate the tunability of their phononic and optoelectronic properties by inelastic light scattering experiments corroborated by ab initio calculations. We observe clear modifications in the dispersion relation for both acoustic and optical phonons in the superlattices nanowires. We find that by controlling the superlattice periodicity, we can achieve tunability of the phonon frequencies. We also performed wavelength-dependent Raman microscopy on GaAs/GaP superlattice nanowires, and our results indicate a reduction in the electronic bandgap in the superlattice compared to the bulk counterpart. All of our experimental results are rationalized with the help of ab initio density functional perturbation theory (DFPT) calculations. This work sheds fresh insights into how material engineering at the nanoscale can tailor phonon dispersion and open pathways for thermal engineering.

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