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.
Wafer-size SnSe thin films with high uniformity and high crystal quality were grown by magnetron sputtering technique, and exhibit a highly sensitive to a broadband wavelength with high responsivity of 277.3 AW−1 and detectivity of 7.6 × 1011 Jones.
Carbon fiber reinforced polymer (CFRP) plays an important role in many fields, especially in aviation and civil industries. The electrical conductivity of CFRP is critical for its electrical behavior, such as its lightning strike vulnerability, electromagnetic shielding ability, and potential uses for self-sensing. In addition, the electrical conductivity is related to the mechanical integrity. Therefore, electrical properties can be measured as an indication when detecting delamination and other defects in CFRP. This review provides a comprehensive basis for readers to grasp recent research progresses on electrical behaviors of CFRP.
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