Anisotropic ultrasensitive PdTe ₂ -based phototransistor for room-temperature long-wavelength detection

Abstract

Emergent topological Dirac semimetals afford fresh pathways for optoelectronics, although device implementation has been elusive to date. Specifically, palladium ditelluride (PdTe2) combines the capabilities provided by its peculiar band structure, with topologically protected electronic states, with advantages related to the occurrence of high-mobility charge carriers and ambient stability. Here, we demonstrate large photogalvanic effects with high anisotropy at terahertz frequency in PdTe2-based devices. A responsivity of 10 A/W and a noise-equivalent power lower than 2 pW/Hz0.5 are achieved at room temperature, validating the suitability of PdTe2-based devices for applications in photosensing, polarization-sensitive detection, and large-area fast imaging. Our findings open opportunities for exploring uncooled and sensitive photoelectronic devices based on topological semimetals, especially in the highly pursuit terahertz band.

Controllable growth of type‐II Dirac semimetal PtTe2 atomic layer on Au substrate for sensitive room temperature terahertz photodetection

“…These activated carriers will be accelerated under electric-field across the channel, which leads to a photoconduction gain. 48 The fast and stable optical response can be preserved across the range from 0.04 to 0.3 THz in our PtTe 2 -based device (Figure 6A), certifying the prospect of broadband operation. The photocurrent of the device irradiated at different THz waves shows a linear increase with bias voltage ranging from À100 to 100 mV (Figure S8).…”

Van der Waals Epitaxial Growth of Mosaic‐Like 2D Platinum Ditelluride Layers for Room‐Temperature Mid‐Infrared Photodetection up to 10.6 µm

“…It is believed that such structure can greatly facilitate the carrier separation and reduce carrier recombination after generation of electron–hole pairs under light illumination. [ 19,45 ] This may also contribute to the enhanced photocurrent. Figure 5d compares the PtTe 2 /Si photodetector with the photodetectors based on 2D materials in prior reports and the commercial products.…”

Monitoring the Covid-19 Diffusion by Combining Wearable Biosensors and Smartphones.

“…Besides, it can record the progress of patient symptoms and monitor them at home while in quarantine. The proposed system is only a preliminary prototype, and its performance can be strongly improved by using innovative two-dimensional semiconductors with higher charge carrier mobility as reported in the related literature [16][17][18][19][20][21][22][23][24][25].…”