Surfactant-free stable SnS2 nanoparticles dispersion for deposition of device-quality films

Haghighi, M ; Sharif University of Technology | 2019

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  1. Type of Document: Article
  2. DOI: 10.1016/j.tsf.2018.11.007
  3. Publisher: Elsevier B.V , 2019
  4. Abstract:
  5. Tin sulfide (SnS2) has recently attracted considerable attention due to its layered structure that may form two dimensional morphologies. It is an n-type semiconductor with band gap and electron affinity similar to CdS and In2S3; therefore can be regarded as an alternative for these materials in thin film solar cells. Here, we synthesis of SnS2 nanoparticles with different morphology in different ratio of water-ethanol mixed solution by solvothermal method, and observe that more ethanol leads to large sheet like morphologies, while water based synthesis results in very small nanosheets. A challenge in wet deposition of device-quality thin films of SnS2 is the requirement for highly dispersed particles/sheets. We found highly polar dimethylformamide (DMF) as the right dispersing medium, yielding highly stable dispersions. Very uniform nanocrystalline thin films with [001] preferred orientation and good adhesion to substrate are simply deposited by drop casting and spin coating a 0.5 wt% DMF sol of SnS2 at 2000 rpm for 1 min. Electron affinity and band gap of the films are 4.33 eV and 2.27 eV, which is well aligned for copper indium gallium sulfo-selenide (CIGS) solar cells. © 2018 Elsevier B.V
  6. Keywords:
  7. Buffer layer ; Copper indium gallium sulfo-selenide solar cells ; Dimethylformamide ; SnS2 thin film ; Surfactant-free dispersion ; Two dimensional structures ; Buffer layers ; Cadmium sulfide ; Copper compounds ; Deposition ; Electron affinity ; Energy gap ; Ethanol ; Gallium compounds ; II-VI semiconductors ; Indium sulfide ; IV-VI semiconductors ; Layered semiconductors ; Morphology ; Nanocrystals ; Nanoparticles ; Nanostructured materials ; Organic solvents ; Semiconducting cadmium compounds ; Semiconducting tin compounds ; Solar cells ; Sols ; Sulfur compounds ; Surface active agents ; Synthesis (chemical) ; Thin film solar cells ; Thin films ; Adhesion to substrate ; N-type semiconductors ; Nanocrystalline thin films ; Preferred orientations ; Selenides ; Surfactant-free dispersions ; Two-dimensional structures ; Water based synthesis ; Tin compounds
  8. Source: Thin Solid Films ; Volume 669 , 2019 , Pages 269-274 ; 00406090 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S004060901830748X