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Download fileNear-Infrared Polarimetric Image Sensors Based on Ordered Sulfur-Passivation GaSb Nanowire Arrays
journal contribution
posted on 2022-05-05, 15:05 authored by Kai Zhang, Zhihui Ren, Huichen Cao, Lingling Li, Ying Wang, Wei Zhang, Yubao Li, Haitao Yang, You Meng, Johnny C. Ho, Zhongming Wei, Guozhen ShenThe
near-infrared polarimetric image sensor has a wide range of
applications in the military and civilian fields, thus developing
into a research hotspot in recent years. Because of their distinguishing
1D structure features, the ordered GaSb nanowire (NW) arrays possess
potential applications for near-infrared polarization photodetection.
In this work, single-crystalline GaSb NWs are synthesized through
a sulfur-catalyzed chemical vapor deposition process. A sulfur-passivation
thin layer is formed on the NW surface, which prevents the GaSb NW
core from being oxidized. The photodetector based on sulfur-passivation
GaSb (S-GaSb) NWs has a lower dark current and higher responsivity
than that built with pure GaSb NWs. The photodetector exhibits a large
responsivity of 9.39 × 102 A/W and an ultrahigh detectivity
of 1.10 × 1011 Jones for 1.55 μm incident light.
Furthermore, the dichroic ratio of the device is measured to reach
2.65 for polarized 1.55 μm light. Through a COMSOL simulation,
it is elucidated that the origin of the polarized photoresponse is
the attenuation of a light electric field inside the NW when the angle
of incident polarization light rotates. Moreover, a flexible polarimetric
image sensor with 5 × 5 pixels is successfully constructed on
the ordered S-GaSb NW arrays, and it exhibits a good imaging ability
for incident near-infrared polarization light. These good photoresponse
properties and polarized imaging abilities can empower ordered S-GaSb
NW arrays with technological potentials in next-generation large-scale
near-infrared polarimetric imaging sensors.
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Keywords
lower dark currentinfrared polarization photodetectioninfrared polarization lightgood imaging ability55 μm light39 × 1010 × 10passivation thin layergood photoresponse propertiespolarized imaging abilities11 </ suppure gasb nwscrystalline gasb nws2 </ supgasb nw coregasb nw arraysordered gasb nanowirepassivation gasbpolarized photoresponsereach 2nw surfacewide rangeultrahigh detectivitythus developingtechnological potentialssuccessfully constructedresearch hotspotrecent yearsphotodetector basedlarge responsivityhigher responsivitygeneration largeempower ordereddichroic ratiocomsol simulationcivilian fields