Strategy and technology to recycle wafer-silicon solar modules

Wen Hsi Huang, Woo Jung Shin, Laidong Wang, Wen Cheng Sun, Meng Tao

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

A major obstacle to sustainable solar technologies is end-of-life solar modules. In this paper, a recycling process is proposed for wafer-Si modules. It is a three-step process to break down Si modules and recover various materials, leaving behind almost nothing for landfill. Two new technologies are demonstrated to enable the proposed recycling process. One is sequential electrowinning which allows multiple metals to be recovered one by one from Si modules, Ag, Pb, Sn and Cu. The other is sheet resistance monitoring which maximizes the amount of solar-grade Si recovered from Si modules. The purity of the recovered metals is above 99% and the recovered Si meets the specifications for solar-grade Si. The recovered Si and metals are new feedstocks to the solar industry and generate $11–12.10/module in revenue. This revenue enables a profitable recycling business for Si modules without any government support. The chemicals for recycling are carefully selected to minimize their environmental impact. A network for collecting end-of-life solar modules is proposed based on the current distribution network for solar modules to contain the collection cost. As a result, the proposed recycling process for wafer-Si modules is technically, environmentally and financially sustainable.

Original languageEnglish (US)
Pages (from-to)22-31
Number of pages10
JournalSolar Energy
Volume144
DOIs
StatePublished - Mar 1 2017

Fingerprint

Silicon wafers
Recycling
Metals
Electrowinning
Sheet resistance
Land fill
Electric power distribution
Feedstocks
Environmental impact
Industry
Specifications
Monitoring
Costs

Keywords

  • End-of-life management
  • End-of-life Si solar modules
  • Recycling
  • Wafer-Si solar modules

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

Cite this

Strategy and technology to recycle wafer-silicon solar modules. / Huang, Wen Hsi; Shin, Woo Jung; Wang, Laidong; Sun, Wen Cheng; Tao, Meng.

In: Solar Energy, Vol. 144, 01.03.2017, p. 22-31.

Research output: Contribution to journalArticle

Huang, Wen Hsi ; Shin, Woo Jung ; Wang, Laidong ; Sun, Wen Cheng ; Tao, Meng. / Strategy and technology to recycle wafer-silicon solar modules. In: Solar Energy. 2017 ; Vol. 144. pp. 22-31.
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