Enhanced Photoresponse of Indium-Doped Tin Disulfide Nanosheets

Abstract

Doping of tin disulfide (SnS 2 ) is an effective strategy to regulate its physical and chemical properties. In this work, In doping was used to manipulate the photoresponse behavior of SnS 2 -based photodetectors. In-doped SnS 2 nanosheets were synthesized via a facile hydrothermal method. It was found that the In doping concentration plays an important role in the size of the fabricated SnS 2 nanosheets. With the increase in the In doping concentration, the lateral size of samples increased from ∼210 to ∼420 nm, but the crystallinity became poor at higher concentrations. Energy dispersive X-ray-mapping results show that the In was homogeneously distributed in the samples. In addition, a red shift was observed in the binding energy of Sn and S with increased In doping concentration, which may be due to the p-type doping of In in SnS 2 . After In doping, the performance of SnS 2 -based photodetectors was significantly improved. The photoresponse speed of In-doped SnS 2 -based photodetectors was faster than that of pristine SnS 2 -based devices under the illumination of 532 and 405 nm lasers. This work develops an effective approach of In doping to enhance the photoresponse characteristics of SnS 2 -based photodetectors and proves that In-doped SnS 2 has a vast potential in optoelectronic applications.

Enhanced Photodetection Performance of Photodetectors Based on Indium-Doped Tin Disulfide Few Layers

“…Similar diffraction peaks in the XRD patterns of In-SnS 2 and pristine SnS 2 single crystals are assigned to the (001), (002), (003), and (004) planes of hexagonal-SnS 2 (JCPDS no. 23-677), , which indicates a high c -axis preferred orientation and higher crystallinity compared with our previous work . No traces of In 2 S 2 and other In-related impurity are observed, indicating In was successfully introduced into the SnS 2 lattice and occupied the Sn site.…”

“…Different than antinomy doping, indium doping SnS 2 is the P-type doping, which would further suppress electronegative defects and photoexcited electron–hole recombination to improve the photodetection performance of SnS 2 -based photodetectors. In our previous work, photodetectors based on hydrothermal heavily indium doped SnS 2 (In-SnS 2 ) nanosheets exhibited a relatively low responsivity (19.5 μA/W for 6 at. % In-SnS 2 nanosheets), and indium doping had little effects on the photodetection performance of photodetectors based on indium doped SnS 2 nanosheets, except response time.…”

Phonon and Carrier Transport Properties in Low-Cost and Environmentally Friendly SnS2: A Promising Thermoelectric Material

“…Since the hydrothermal and solvothermal method has strong operability and adjustability, it can be used to prepare SnS 2 particles with different shapes and sizes. As shown in Figure b, Sn-containing precursors such as SnCl 2 ·2H 2 O or SnCl 4 ·5H 2 O and S-containing precursors such as thioacetamide (C 2 H 5 NS) or thiourea (CH 4 N 2 S) are used as raw materials, and deionized water or other solvents such as ethanol or isopropanol are used as the reaction medium. − Raw materials and deionized water or other solvents are mixed in a certain order and stirred for several minutes to a few hours to obtain a homogeneous solution, and then the solution is transferred into a Teflon-lined stainless steel autoclave and usually heated at 473 K for several hours. − In the process of synthesis, high vapor pressure can be achieved in the sealing vessel due to the reaction temperature being higher than the boiling point of the mixed solution. Therefore, the precursors in this environment will be decomposed into tin ions and sulfur ions, and the reaction between the ions will form SnS 2 crystal nuclei, which will become the core of crystal growth.…”

“…Therefore, the precursors in this environment will be decomposed into tin ions and sulfur ions, and the reaction between the ions will form SnS 2 crystal nuclei, which will become the core of crystal growth. When the reaction is finished, 2H-SnS 2 will usually be obtained after the processes of centrifugation and washing with deionized water and drying in a vacuum oven. − …”

Embedding tin disulfide nanoparticles in two-dimensional porous carbon nanosheet interlayers for fast-charging lithium-sulfur batteries

“…As such, its excellent chemical adsorption allows SnS 2 to be developed into new types of Li-S battery host materials [40]. However, most of the synthesized SnS 2 structures are in flake structure [41,42]. Although the sheet-like structure greatly increases the specific surface area, its large size increases the time needed for activating the active material and reduces the electrical conductivity [39].…”