Black-phosphorus-analogue tin monosulfide: an emerging optoelectronic two-dimensional material for high-performance photodetection with improved stability under ambient/harsh conditions

Abstract

Black-phosphorus-analogue tin monosulfide was successfully introduced to resolve the instability issue of black phosphorus.

Solution‐Processed GaSe Nanoflake‐Based Films for Photoelectrochemical Water Splitting and Photoelectrochemical‐Type Photodetectors

“…As expected from the DRS analysis (Figure i), the responsivity of the GaSe photodetectors shows the maximum values (157 mA W −1 at −0.3 V vs RHE and 117 mA W −1 at +0.8 V vs RHE) under illumination at 455 nm, in agreement with the R data of the GaSe flakes in IPA dispersion. These responsivity values approach those of self‐powered commercial UV–Vis photodetectors (e.g., Si‐ or GaP‐based photodiodes), and are superior to those of relevant self‐powered or low‐voltage operating solution‐processed photodetectors (Table S2, Supporting Information) . The stability of the PEC responses were evaluated by measuring the responsivity over repeated LSV scans.…”

Self‐Powered Photodetectors Based on 2D Materials

“…PEC measurements show that the PEC photodetectors based on Bi 2 S 3 nanosheets have good photoresponse characteristics and self‐powered light detection characteristics in alkaline solution; they have a light responsivity of 8.9 µA W −1 in a 0.1 m KOH solution at a bias of 0 V. In addition, the photoresponse performance of the Bi 2 S 3 ‐based PEC‐type photodetector can be adjusted with electrolyte concentration and external bias, and its photoresponsivity increases to 210 µA W −1 in 1 m KOH solution at 0.6 V bias. Subsequently, PEC‐type photodetectors based on 2D SnS nanosheets were reported in which 2D SnS nanosheets were prepared by a simple liquid phase exfoliation method (Figure d) . In the neutral Na 2 SO 4 solution, PEC‐type photodetectors based on 2D SnS nanosheets not only have the capability of self‐powered photodetectors (5.2 mA W −1 photoresponsivity at 365 nm, 0.1 m Na 2 SO 4 , and zero bias) but also have the best optical responsivity (59.8 µA W −1 photoresponsivity at 365 nm, 1 m Na 2 SO 4 , and 1 V bias).…”

“…d) Photoresponse characteristics of the photodetectors based on SnS nanosheets. Reproduced with permission . Copyright 2018, The Royal Society of Chemistry.…”

Epitaxial Growth of Topological Insulators on Semiconductors (Bi2Se3/Te@Se) toward High‐Performance Photodetectors

“…The reasonable explanation can be ascribed to the different functionalities between Bi 2 Se 3 /Te@Se and the electrolytes . Compared with the other two electrolytes, HCl electrolyte possesses more proton H + which can be attached to the surface of Bi 2 Se 3 /Te@Se by transferring the positive charge, thus leading to the increased P ph . Figure b–d shows the self‐driven photoresponse behavior of the Bi 2 Se 3 /Te@Se‐based PDs under different wavelengths (λ = 365, 400, 475, 550, 600, and 700 nm).The PDs show increased P ph with the increased light power density in each electrolyte.…”