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Encoding Active Device Elements at Nanowire Tips.

You-Shin No^1,2, Ruixuan Gao¹, Max N Mankin¹

¹Department of Chemistry and Chemical Biology, Harvard University , Cambridge, Massachusetts 02138, United States.

|June 24, 2016

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Researchers developed novel tip-modulated nanowires for highly sensitive detection. These semiconductor nanowires precisely localize electronic and optoelectronic functions at one end, enabling advanced sensing applications.

Area of Science:

Materials Science
Nanotechnology
Electrical Engineering

Background:

Semiconductor nanowires offer potential for sensitive, localized signal detection.
A key challenge is confining device functionality to one end of these 1D structures.

Purpose of the Study:

To develop a new nanowire structure with localized electronic or optoelectronic device function at one end.
To demonstrate a general synthesis scheme for tip-modulated nanowires and their application in nanoscale devices.

Main Methods:

A bottom-up synthesis scheme was developed to create tip-modulated nanowires.
Nanoscale p-n junctions were synthesized using silicon (Si) with modulated material and dopant at the tip.
Electron microscopy, electrical transport measurements, and photocurrent experiments were used for characterization.

Keywords:

One-dimensional nanostructure nanodevice photodetector potentiometric sensor p−n junction wafer-scale nanodevices

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Main Results:

Verified p-Si core with SiO2 insulating inner shell and n-Si outer shell forming a clean p-Si/n-Si tip junction.
Demonstrated current rectification through the tip with high sensitivity localized to within 0.5 μm.
Achieved temporal resolution of at least 0.1 ms and responsivity up to 0.22 A/W in photocurrent experiments.

Conclusions:

Tip-modulated nanowires enable precise localization of electronic and optoelectronic functions.
The developed synthesis methods allow for scalable production and fabrication into device arrays.
These devices hold significant promise for biological/chemical sensing and nanoscale optoelectronics.