A polarization-sensitive photothermoelectric photodetector based on mixed-dimensional SWCNT–MoS₂ heterostructures

Abstract

Mixed-dimensional van der Waals (vdW) integration has been demonstrated to be effective for the modulation of physical properties of homogenous materials. Herein, we reported the enhancement of photothermal conversion and...

High-Performance Flexible Broadband Photothermoelectric Photodetectors Based on Tellurium Films

“…The rise/fall time serves as a vital metric for photodetectors, denoting the time interval encompassing 10 and 90% of the peak photocurrent. As illustrated in Figure c, the measured rise/fall time stands at 8.3/8.8 ms, demonstrating a noteworthy improvement in speed when contrasted with previously reported PTE detectors. ,,, The fast speed of the device based on the Te-NRs film gives it significant potential in optical communication, dynamic imaging, and motion detection. To further investigate the mechanism of the PTE effect, 520 nm laser spot scanning was performed at different power densities along the films between the two electrodes (Figure d).…”

“…Since the temperature distribution is symmetrical, the I – V curve obtained from laser irradiation at position C closely matches the dark curve, implying that almost no obvious photoresponse from the photoconductive mechanism could be induced. On the other hand, significant upward and downward shifts can be observed in the I – V curves (blue and red lines) when the left and right ends are illuminated. − This phenomenon can be attributed to the temperature gradient, which fosters the generation of an intrinsic electric field extending from the left (L) to the right (R) end. As a result, the channel layer experiences a drift of hole-type carriers due to this field, resulting in a negative voltage. − Conversely, a positive voltage can be generated.…”

“…The high purity of Te-NRs is due to the clean, high-vacuum growth environment provided by magnetron sputtering. Table summarizes the comparison of photodetector devices reported in the literature. ,,,,− Compared to other photodetectors, the device displays an exceptional optical response and fast response speed, indicating its promising applications in broadband, flexible, and sensitive photodetectors.…”