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Broadband GaAsSb Nanowire Array Photodetectors for Filter-Free Multispectral Imaging.

Ziyuan Li¹, Simeon Trendafilov², Fanlu Zhang¹

¹Department of Electronic Materials Engineering, Research School of Physics, The Australian National University, Canberra, ACT 2601, Australia.

|August 23, 2021

Summary

Researchers developed filter-free multispectral photodetectors using GaAsSb nanowire arrays. These compact devices offer over 10 detection channels for visible and near-infrared light, enabling advanced imaging applications.

Keywords:

GaAsSb III−V semiconductor VLS multispectral imaging nanowire photodetector

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Area of Science:

Materials Science
Optoelectronics
Nanotechnology

Background:

Multispectral photodetectors are crucial for applications like biological imaging and remote sensing.
Current technologies often rely on bulky optical filters, limiting miniaturization and performance.

Purpose of the Study:

To demonstrate compact, filter-free multispectral photodetectors.
To explore the use of Gallium Arsenide Antimonide (GaAsSb) nanowire arrays for wavelength-selective light detection.

Main Methods:

Growth of GaAsSb nanowire arrays using metalorganic vapor phase epitaxy.
Experimental and theoretical investigation of geometry-dependent tunable spectral photoresponse.
Characterization of photodetector performance, including responsivity and detectivity.

Main Results:

Demonstrated room-temperature operation of wavelength-selective photodetectors with over 10 detection channels (visible to near-infrared).
Attributed spectral selectivity to tunable resonance modes within the GaAsSb nanowires.
Achieved high responsivity (44.9 A/W) and detectivity (1.2 × 10^12 cm√Hz/W), enabling high-resolution RGB imaging.

Conclusions:

GaAsSb nanowire array photodetectors offer a filter-free solution for multispectral imaging.
These devices show significant potential for next-generation high-quality multispectral imagers.
The demonstrated technology is suitable for compact, high-performance sensing applications.