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Doping evaluation of InP nanowires for tandem junction solar cells
Nanotechnology
|January 15, 2016
Summary
Optimizing indium phosphide (InP) nanowire doping is crucial for solar cell development. Researchers achieved carrier concentrations up to 10(19) cm(-3) by adjusting growth conditions, revealing insights into doping behavior.
Area of Science:
- Semiconductor Nanostructures
- Materials Science
- Photovoltaics
Background:
- Nanowire-based solar cells require precise control over material properties for enhanced performance.
- Indium phosphide (InP) nanowires are promising candidates for next-generation solar energy applications.
- Optimizing doping levels in nanowires is essential for efficient charge carrier transport.
Purpose of the Study:
- To evaluate the doping characteristics of n-type InP nanowires grown by metal-organic vapor phase epitaxy (MOVPE).
- To determine the relationship between growth parameters and charge carrier concentration in InP nanowires.
- To establish optimal conditions for achieving high doping levels in InP nanowires for solar cell applications.
Main Methods:
- Utilized particle-assisted MOVPE with tetraethyltin (TESn) as the dopant precursor.
- Investigated the effect of varying trimethylindium (TMIn) molar fraction on doping levels.
- Employed four-probe resistivity and spatially resolved Hall measurements for carrier concentration evaluation.
- Monitored nanowire growth rates in situ using optical reflectometry.
- Analyzed nanowire polytypism using transmission electron microscopy (TEM).
Main Results:
- Achieved charge carrier concentrations ranging from approximately 10(16) cm(-3) to 10(19) cm(-3).
- Observed a saturation in carrier concentration at approximately 10(19) cm(-3) with increasing IV/III ratio.
- Identified axial carrier concentration gradients correlated with growth rate variations and observed polytypism.
- Demonstrated that high TMIn molar fractions resulted in lower carrier concentrations.
Conclusions:
- The study successfully evaluated doping in InP nanowires, providing a pathway for optimizing solar cell efficiency.
- Growth parameter control, specifically the TMIn molar fraction, significantly influences carrier concentration in InP nanowires.
- Understanding and controlling axial gradients and polytypism are key to achieving uniform and high doping levels in nanowire devices.
