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Life cycle analysis of silane recycling in amorphous silicon-based solar photovoltaic manufacturing

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  • Kreiger, M.A.
  • Shonnard, D.R.
  • Pearce, J.M.

Abstract

Amorphous silicon (a-Si:H)-based solar cells have the lowest ecological impact of photovoltaic (PV) materials. In order to continue to improve the environmental performance of PV manufacturing using proposed industrial symbiosis techniques, this paper performs a life cycle analysis (LCA) on both conventional 1-GW scaled a-Si:H-based single junction and a-Si:H/microcrystalline-Si:H tandem cell solar PV manufacturing plants and such plants coupled to silane recycling plants. Both the energy consumed and greenhouse gas emissions are tracked in the LCA, then silane gas is reused in the manufacturing process rather than standard waste combustion. Using a recycling process that results in a silane loss of only 17% instead of conventional processing that loses 85% silane, results in an energy savings of 81,700GJ and prevents 4400 tons of CO2 from being released into the atmosphere per year for the single junction plant. Due to the increased use of silane for the relatively thick microcrystalline-Si:H layers in the tandem junction plants, the savings are even more substantial – 290,000GJ of energy savings and 15.6 million kg of CO2 eq. emission reductions per year. This recycling process reduces the cost of raw silane by 68%, or approximately $22.6 million per year for a 1-GW a-Si:H-based PV production facility and over $79 million per year for tandem manufacturing. The results are discussed and conclusions are drawn about the technical feasibility and environmental benefits of silane recycling in an eco-industrial park centered around a-Si:H-based PV manufacturing plants.

Suggested Citation

  • Kreiger, M.A. & Shonnard, D.R. & Pearce, J.M., 2013. "Life cycle analysis of silane recycling in amorphous silicon-based solar photovoltaic manufacturing," Resources, Conservation & Recycling, Elsevier, vol. 70(C), pages 44-49.
    • Handle: RePEc:eee:recore:v:70:y:2013:i:c:p:44-49
    DOI: 10.1016/j.resconrec.2012.10.002
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    References listed on IDEAS

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    Cited by:

    1. Tsiliyannis, Christos Aristeides, 2015. "Sustainability by cyclic manufacturing: Assessment of resource preservation under uncertain growth and returns," Resources, Conservation & Recycling, Elsevier, vol. 103(C), pages 155-170.
    2. Wu, Tian & Zhou, Wei & Yan, Xiaoyu & Ou, Xunmin, 2016. "Optimal policy design for photovoltaic power industry with positive externality in China," Resources, Conservation & Recycling, Elsevier, vol. 115(C), pages 22-30.

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