Journal
NANOSCALE
Volume 11, Issue 40, Pages 18550-18558Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9nr03187a
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Funding
- NanoLund at Lund University
- Knut and Alice Wallenberg Foundation
- Crafoord Foundation
- Swedish Energy Agency
- Swedish Research Council
- PhD4Energy
- China Scholarship Council
- Czech Science Foundation [17-03662S]
- Operational Programme Research, Development and Education - European Structural and Investment Funds
- Czech Ministry of Education, Youth and Sports [SOLID21-CZ.02.1.01/0.0/0.0/16_019/0000760]
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Introduction of in situ HCl etching to an epitaxial growth process has been shown to suppress radial growth and improve the morphology and optical properties of nanowires. In this paper, we investigate the dynamics of photo-generated charge carriers in a series of indium phosphide nanowires grown with varied HCl fluxes. Time resolved photo-induced luminescence, transient absorption and time resolved terahertz spectroscopy were employed to investigate charge trapping and recombination processes in the nanowires. Since the excitation photons generate charges predominantly in less than a half length of the nanowires, we can selectively assess the charge carrier dynamics at their top and bottom. We found that the photoluminescence decay is dominated by the decay of the mobile hole population due to trapping, which is affected by the HCl etching. The hole trapping rate is in general faster at the top of the nanowires than at the bottom. In contrast, electrons remain highly mobile until they recombine nonradiatively with the trapped holes. The slowest hole trapping as well as the least efficient non-radiative recombination was recorded for etching using the HCl molar fraction of chi(HCl) = 5.4 x 10(-5).
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