Green Synthesis of Lead-Free Perovskite Solar Cells

  • Author: ChemistryViews.org
  • Published: 09 August 2019
  • Copyright: Wiley-VCH Verlag GmbH & Co. KGaA
  • Source / Publisher: Communications Chemistry/Springer Nature Limited
thumbnail image: Green Synthesis of Lead-Free Perovskite Solar Cells

Solar cells made from hybrid organic-inorganic lead-halide perovskites are promising. They can reach power conversion efficiencies of up to 24 %, which is comparable to silicon-based solar cells. However, the lead contained in them is toxic. Lead-free alternatives based on, e.g., bismuth, antimony, or tin usually require toxic solvents in their preparation. They are generally less efficient but have a higher stability.


Sagar M. Jain, Swansea University, UK, and colleagues have developed a green synthesis of lead-free, bismuth-based perovskites, i.e., (CH3NH3)3Bi2I9 or MBI, which uses the non-toxic solvent methyl acetate. The team placed the perovskite on a layered architecture of the type FTO/compact TiO2/mesoporous TiO2 to create photovoltaic cells (FTO =  fluorine-doped tin oxide (FTO)-coated glass). This structure was created by spin-coating glass, first with compact and mesoporous TiO2 films and then with a solution of methylammonium iodide (MAI) and BiI3 in methyl acetate. The films were then annealed at 150 °C.


2,2',7,7'-tetrakis(N,N'-di-p-methoxyphenylamino)−9,9'-spirbiuorene (Spiro-OMeTAD) or poly(3-hexylthiophene-2,5-diyl) (P3HT) were used as hole-transporting materials. Carbon paste was used as a counter electrode. The resulting devices containing either Spiro-OMeTAD or P3HT reach efficiencies of 1.12 % and 1.62 %, respectively. These values are comparable to bismuth-based perovskites synthesized using toxic solvents. According to the researchers, the approach could be scaled up and provide a green way to produce lead-free perovskite solar cells.


 

Article Views: 487

Sign in Area

Please sign in below

Additional Sign In options

Please note that to comment on an article you must be registered and logged in.
Registration is for free, you may already be registered to receive, e.g., the newsletter. When you register on this website, please ensure you view our terms and conditions. All comments are subject to moderation.

Article Comments - To add a comment please sign in

Bookmark and Share

If you would like to reuse any content, in print or online, from ChemistryViews.org, please contact us first for permission. more


CONNECT:

ChemistryViews.org on Facebook

ChemistryViews.org on Twitter ChemistryViews.org on YouTube ChemistryViews.org on LinkedIn Sign up for our free newsletter


A product of ChemPubSoc Europe (16 European Chemical Societies)and Wiley-VCH