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Thermal Localization Enhanced Fast Photothermoelectric Response in a Quasi-One-Dimensional Flexible NbS3 Photodetector
journal contribution
posted on 2020-03-11, 15:51 authored by Weidong Wu, Yingxin Wang, Yingying Niu, Pengfei Wang, Meng Chen, Jialin Sun, Nanlin Wang, Dong Wu, Ziran ZhaoUltra-broadband
photodetection is crucial for various applications
like imaging and sensing and has become a hot research topic in recent
years. However, most of the reported ultra-broadband photodetectors
can only cover the range from ultraviolet to infrared, which is insufficient.
Herein, a photothermoelectric (PTE) detector made of NbS3 is reported. The device shows a considerable performance from ultraviolet
to terahertz. For all examined wavelengths, the photoresponsivities
are all larger than 1 V W–1 while the response time
is less than 10 ms, much shorter than the reported ultra-broadband
photodetectors made of millimetric scale graphene, ternary chalcogenide
single crystal, and other materials. The extraordinary performance
is fully discussed and can be attributed to the thermal localization
enhanced PTE effect. Because of the short thermal decay length and
low thermal loss, the heat generated by the illumination is localized
in only a micrometer scale along the channel, and thus a strong PTE
response is produced. In addition, the fabricated device also demonstrates
robust flexibility and stability. Thanks to the quasi-one-dimensional
(quasi-1D) structure, the NbS3 crystal is easy to be scaled
down and thus intrinsically facilitate the integration of detectors.
With these favorable merits, the quasi-1D NbS3 crystal
holds a promising potential in high-performance, ultra-broadband photodetectors.