Tuning electronic and photocatalytic properties in pulsed light synthesis of Cu2ZnSnS4 films from CuS-ZnS-SnS nanoparticles
| Autor: | Chih-Hung Chang, Cheng Zeng, Hyun-Jun Hwang, Michael Dexter, Changqing Pan, Rajiv Malhotra |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Band gap Chalcogenide Nanoparticle 02 engineering and technology engineering.material 010402 general chemistry 01 natural sciences Fluence chemistry.chemical_compound General Materials Science CZTS Kesterite Thin film business.industry Mechanical Engineering 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences chemistry Mechanics of Materials Photocatalysis engineering Optoelectronics 0210 nano-technology business |
| Zdroj: | Materials Research Bulletin. 122:110645 |
| ISSN: | 0025-5408 |
| Popis: | We investigate rapid in-situ synthesis of Cu2ZnSnS4 (CZTS) thin films via Intense Pulsed Light (IPL) irradiation of solution-deposited and mixed binary CuS, ZnS, SnS nanoparticles (NPs) in ambient conditions. The film phase, composition, morphology, electrical properties, optical properties and photocatalytic activity are characterized as a function of the optical fluence. Crystalline pure-phase kesterite CZTS films with high p-type conductivity of 51 S/cm and optical band gap 1.42 eV are synthesized within 15 s. Surprisingly, using supra-optimal IPL fluence (in 19 s) yields films with a composite CZTS-SnO2/SnS2 composition that exhibits about 20% higher photocatalytic efficiency and higher carrier mobility (≈ 120 cm2/Vs) than pure-phase kesterite films. The reaction pathways during IPL irradiation and the resulting film composition are used to understand the enhanced photocatalysis for the supra-optimal fluence. This work will create new avenues for scalable IPL-based bottom-up synthesis of new multinary chalcogenide composites from their binary NPs. |
| Databáze: | OpenAIRE |
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