Improving the Field‐Effect Performance of Bi₂S₃ Single Nanowires by an Asymmetric Device Fabrication

Abstract

High-quality Bi2 S3 nanowires are synthesized by chemical vapor deposition and their intrinsic photoresponsive and field-effect characteristics are explored in detail. Among the studied Au-Au, Ag-Ag, and Au-Ag electrode pairs, the device with stepwise band alignment of asymmetric Au-Ag electrodes has the highest mobility. Furthermore, it is shown that light can cause a sevenfold decrease of the on/off ratio. This can be explained by the photoexcited charge carriers that are more beneficial to the increase of Ioff than Ion . The photoresponsive properties of the asymmetric Au-Ag electrode devices were also explored, and the results show a photoconductive gain of seven with a rise time of 2.9 s and a decay time of 1.6 s.

Exfoliation of Quasi-Stratified Bi2S3 Crystals into Micron-Scale Ultrathin Corrugated Nanosheets

“…Native bulk Bi 2 S 3 has a direct band gap of 1.3 eV. 3 This value can be tuned by altering the dimensions of the material, increasing to values as high as 2.0 eV for Bi 2 S 3 nanoparticles. 18 In a nano ribbon morphology, this material has shown a photoresponsitivity exceeding 4 A/W, resulting in a quantum efficiency of above 850%.…”

An Efficient and Low‐Cost Photolithographic‐Pattern‐Transfer Technique to Fabricate Electrode Arrays for Micro‐/Nanoelectronics

“…The distinct output performance under disparate field effects in Figure g also further confirms the reliability of our PPT method. Similarly, devices with electrodes of different metals (metal1–TMDs–metal2) could also be achieved by multiple transfers through the PPT technique …”

Bi2S3 microflowers assembled from one-dimensional nanorods with a high photoresponse

“…Besides, nanoarchitecture Bi 2 S 3 , owing to hierarchical structure, high surface area, high crystallinity for fast electron separation and transport, has been used as an efficient photoactive material more frequently [24]. It is well known that photoresponse properties are largely determined by morphology, so many approaches have been proposed to synthesize various Bi 2 S 3 nanostructures, such as microwave irradiation [25], chemical vapor deposition (CVD) method [26,27], anodized alumina membrane method [28], sonochemical approach [29], solvothermal process [30], electrochemical deposition [9], and biomolecule-assisted route [22]. Compared with the approaches mentioned above, hydrothermal process [11] is a more facile, low cost, and easy route to obtain Bi 2 S 3 nanostructures with high crystallinity.…”