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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