A simple green process to recycle Si from crystalline-Si solar cells

Wen Hsi Huang, Meng Tao

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Scopus citations

Abstract

Solar-grade Si can be recycled from end-of-life crystalline-Si solar cells and this recycled Si can be a new feedstock for growth of Si ingots. This study focuses on removing heavily-doped layers from crystalline-Si solar cells and extracting the Si base for recycling. The solar cells used in the study are commercial cells without the front Ag electrode. It is demonstrated that the heavily-doped layers can be removed within 30 min at 50°C, and over 90% of the Si in the original cells can be recovered. Our method is simple and green, involving only three chemicals, HCl, HF and NaOH. In addition, a technique to monitor the removal of the heavily-doped layers based on four-point probe is illustrated.

Original languageEnglish (US)
Title of host publication2015 IEEE 42nd Photovoltaic Specialist Conference, PVSC 2015
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Print)9781479979448
DOIs
StatePublished - Dec 14 2015
Event42nd IEEE Photovoltaic Specialist Conference, PVSC 2015 - New Orleans, United States
Duration: Jun 14 2015Jun 19 2015

Other

Other42nd IEEE Photovoltaic Specialist Conference, PVSC 2015
CountryUnited States
CityNew Orleans
Period6/14/156/19/15

Keywords

  • crystalline-Si solar cells
  • end-of-life Si solar cells
  • four-point probe
  • recycling
  • silicon feedstock

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials

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    Huang, W. H., & Tao, M. (2015). A simple green process to recycle Si from crystalline-Si solar cells. In 2015 IEEE 42nd Photovoltaic Specialist Conference, PVSC 2015 [7356259] Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/PVSC.2015.7356259