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Recycling of Photovoltaic Cells and other Si, Ge Elecronic Waste.

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    SYSNO ASEP0510208
    Document TypeC - Proceedings Paper (int. conf.)
    R&D Document TypeO - Ostatní
    TitleRecycling of Photovoltaic Cells and other Si, Ge Elecronic Waste.
    Author(s) Bumba, Jakub (UCHP-M) SAI
    Dřínek, Vladislav (UCHP-M) RID, SAI
    Fajgar, Radek (UCHP-M) RID, ORCID, SAI
    Kaštánek, František (UCHP-M) RID, SAI, ORCID
    Šolcová, Olga (UCHP-M) RID, ORCID, SAI
    Article number082
    Source TitleProceedings Sardinia 2019. - Padova : CISA Publisher, 2019
    Number of pages6 s.
    Publication formMedium - C
    ActionInternational Waste Management and Landfill Symposium /17./
    Event date30.09.2019 - 04.10.2019
    VEvent locationCagliari
    CountryIT - Italy
    Event typeEUR
    Languageeng - English
    CountryIT - Italy
    Keywordselectronic waste recycling ; silicon ; germanium
    Subject RIVCI - Industrial Chemistry, Chemical Engineering
    OECD categoryChemical process engineering
    R&D ProjectsTN01000048 GA TA ČR - Technology Agency of the Czech Republic (TA ČR)
    Institutional supportUCHP-M - RVO:67985858
    AnnotationNew 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.
    WorkplaceInstitute of Chemical Process Fundamentals
    ContactEva Jirsová,, Tel.: 220 390 227
    Year of Publishing2020
    Electronic address
Number of the records: 1