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Carrier Recombination Processes in Gallium Indium Phosphide Nanowires
Wei Zhang1, Xulu Zeng2, Xiaojun Su1
1NanoLund and Division of Chemical Physics, Lund University , Box 124, 221 00 Lund, Sweden.
Nano Letters
|June 28, 2017
Summary
Understanding charge carrier dynamics in Gallium Indium Phosphide (GaxIn1-xP) nanowires is key for optoelectronics. Increasing Ga composition accelerates trapping and recombination, impacting electron mobility.
Area of Science:
- Semiconductor Nanowires
- Optoelectronics
- Charge Carrier Dynamics
Background:
- Gallium Indium Phosphide (GaxIn1-xP) nanowires (NWs) are promising for optoelectronic devices.
- Understanding charge carrier recombination and photoconductivity is crucial for optimizing NW performance.
Purpose of the Study:
- Investigate recombination and photoconductivity dynamics in GaxIn1-xP NWs with varying Ga composition.
- Determine the influence of Ga composition on charge carrier behavior and mobility.
Main Methods:
- Time-resolved photoinduced luminescence
- Femtosecond transient absorption spectroscopy
- Time-resolved terahertz (THz) transmission measurements
Main Results:
- Radiative recombination is limited by hole trapping; electrons are mobile but undergo nonradiative recombination.
- Electron mobility decreases due to trapping/detrapping in trap states.
- Nonradiative recombination is slower than photoluminescence decay.
- Trapping and nonradiative recombination accelerate with increasing Ga composition.
- Electron mobility is strongly Ga composition-dependent, influenced by X-valley electrons.
Conclusions:
- Ga composition significantly impacts charge carrier dynamics in GaxIn1-xP NWs.
- Hole trapping limits radiative recombination, while electron trapping reduces mobility.
- Findings provide insights for designing efficient GaxIn1-xP based optoelectronic devices.
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