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Recycling of Photovoltaic Cells and other Si, Ge Elecronic Waste.
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SYSNO ASEP 0510208 Document Type C - Proceedings Paper (int. conf.) R&D Document Type O - Ostatní Title Recycling of Photovoltaic Cells and other Si, Ge Elecronic Waste. Author(s) Bumba, Jakub (UCHP-M) SAI
Dřínek, Vladislav (UCHP-M) RID, ORCID, SAI
Fajgar, Radek (UCHP-M) RID, ORCID, SAI
Kaštánek, František (UCHP-M) RID, SAI, ORCID
Šolcová, Olga (UCHP-M) RID, ORCID, SAIArticle number 082 Source Title Proceedings Sardinia 2019. - Padova : CISA Publisher, 2019 Number of pages 6 s. Publication form Medium - C Action International Waste Management and Landfill Symposium /17./ Event date 30.09.2019 - 04.10.2019 VEvent location Cagliari Country IT - Italy Event type EUR Language eng - English Country IT - Italy Keywords electronic waste recycling ; silicon ; germanium Subject RIV CI - Industrial Chemistry, Chemical Engineering OECD category Chemical process engineering R&D Projects TN01000048 GA TA ČR - Technology Agency of the Czech Republic (TA ČR) Institutional support UCHP-M - RVO:67985858 Annotation New technology for electronic waste recycling to produce ultrapure silicon, germanium or CVD precursors was thoroughly studied, designed and verified. The three-step-process is based on low-temperature synthesis of magnesium silicide (Mg2Si) and/or germanide (Mg2Ge) directly from end-of-life photovoltaic cells and waste magnesium chips in the case of magnesium silicide and from broken germanium optical lenses and magnesium chips in the case of magnesium germanide preparation. The prepared products were characterised by X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM) with Energy Dispersive X-Ray Spectroscopy (EDX) and Raman spectroscopy, which confirmed high conversion to desired products, its good crystallinity and also homogeneity. Prepared samples were then hydrolysed by phosphoric acid solution to produce silicon and/or germanium hydrides. Their presence was confirmed by Fourier Transform Infrared Spectroscopy (FTIR) and Gas Chromatography–Mass Spectroscopy (GC-MS). In the next step, it was also tested that silicon and also germanium hydrides are relatively instable to the point that they can be easily decomposed into ultrapure elements Si, Ge and hydrogen. Additionally, it is possible to use them as desirable precursors for the preparation of thin silicon and germanium layers or for the synthesis of metal silicides and germanides by Chemical Vapour Deposition (CVD) methods. The thin semiconductive layers are commonly used in microelectronic industry, while metal silicides and germanides could find potential use in the field of catalysis, thermoelectricity and electronics. The only by-product of the whole process, magnesium phosphate, can be used as a fertilizer. Workplace Institute of Chemical Process Fundamentals Contact Eva Jirsová, jirsova@icpf.cas.cz, Tel.: 220 390 227 Year of Publishing 2020 Electronic address http://hdl.handle.net/11104/0300740
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