A life cycle assessment of perovskite/silicon tandem solar cells

Marina Monteiro Lunardi, Anita Wing Yi Ho-Baillie, Juan Pablo Alvarez-Gaitan, Stephen Moore, Richard Corkish*

*Corresponding author for this work

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

Given the rapid progress in perovskite solar cells in recent years, perovskite/silicon (Si) tandem structure has been proposed to be a potentially cost-effective improvement on Si solar cells because of its higher efficiency at a minimal additional cost. As part of the evaluation, it is important to conduct a life cycle assessment on such technology in order to guide research efforts towards cell designs with minimum environmental impacts. Here, we carry out a life cycle assessment to assess global warming, human toxicity, freshwater eutrophication and ecotoxicity and abiotic depletion potential impacts and energy payback time associated with three perovskite/Si tandem cell structures using silver (Ag), gold (Au) and aluminium (Al) as top electrodes compared with p–n junction and hetero-junction with intrinsic inverted layer Si solar cells. It was found that the replacement of the metal electrode with indium tin oxide/metal grid in the tandem cell reduces the environmental impacts significantly compared with the perovskite cell. For all the impacts assessed, we conclude that the perovskite/Si tandem using Al as top electrode has better environmental outcomes, including energy payback time, when compared with the other tandem structures studied. Use of Al in preference to noble metals for contacts, Si p–n junction in preference to intrinsic inverted layer and the avoidance of 2,20,7,70-tetrakis(N,N-di-p-methoxyphenylamine)9,90-spirobifluorene (Spiro-OMeTAD) are environmentally beneficial. The key result found of this work is that the most important factor for the better environmental impacts of these tandem solar cells is the transparency and electrical conductivity of the perovskite layer after it fails.

Original languageEnglish
Pages (from-to)679-695
Number of pages17
JournalProgress in Photovoltaics: Research and Applications
Volume25
Issue number8
DOIs
Publication statusPublished - Aug 2017
Externally publishedYes

Keywords

  • LCA
  • life cycle assessment
  • tandem solar cells
  • environmental impacts

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