Flexible
SnSe Photodetectors with Ultrabroad Spectral
Response up to 10.6 μm Enabled by Photobolometric Effect
Posted on 2020-07-24 - 20:43
A broad
spectral response is highly desirable for radiation detection
in modern optoelectronics; however, it still remains a great challenge.
Herein, we report a novel ultrabroadband photodetector based on a
high-quality tin monoselenide (SnSe) thin film, which is even capable
of detecting photons with energies far below its optical band gap.
The wafer-size SnSe ultrathin films are epitaxially grown on sodium
chloride via the 45° in-plane rotation by employing a sputtering
method. The photodetector delivers sensitive detection to ultraviolet–visible–near
infrared (UV–Vis–NIR) lights in the photoconductive
mode and shows an anomalous response to long-wavelength infrared at
room temperature. Under the mid-infrared light of 10.6 μm, the
fabricated photodetector exhibits a large photoresponsivity of 0.16
A W–1 with a fast response rate, which is ∼3
orders of magnitude higher than other results. The thermally induced
carriers from the photobolometric effect are responsible for the sub-bandgap
response. This mechanism is confirmed by a temperature coefficient
of resistance of −2.3 to 4.4% K–1 in the
film, which is comparable to that of the commercial bolometric detectors.
Additionally, the flexible device transferred onto polymer templates
further displays high mechanical durability and stability over 200
bending cycles, indicating great potential toward developing wearable
optoelectronic devices.
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Xu, Hanyang; Hao, Lanzhong; Liu, Hui; Dong, Shichang; Wu, Yupeng; Liu, Yunjie; et al. (2020). Flexible
SnSe Photodetectors with Ultrabroad Spectral
Response up to 10.6 μm Enabled by Photobolometric Effect. ACS Publications. Collection. https://doi.org/10.1021/acsami.0c09561
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AUTHORS (13)
HX
Hanyang Xu
LH
Lanzhong Hao
HL
Hui Liu
SD
Shichang Dong
YW
Yupeng Wu
YL
Yunjie Liu
BC
Banglin Cao
ZW
Zegao Wang
CL
Cuicui Ling
SL
Shouxi Li
ZX
Zhijie Xu
QX
Qingzhong Xue
KY
Keyou Yan
KEYWORDS
Ultrabroad Spectral Responseband gappolymer templatesphotoconductive modephotodetector exhibitssub-bandgap responsephotobolometric effecttemperature coefficient10.6 μ mresponse rateradiation detectionnovel ultrabroadband photodetectorFlexible SnSe PhotodetectorsPhotobolometric Effectwafer-size SnSe ultrathin filmsUVtin monoselenidewearable optoelectronic devicesbolometric detectorssodium chloridemid-infrared lightroom temperature10.6 μ m Enabled