Direct Deposition of Non-Aqueous SnO2 Dispersion by Blade Coating on Perovskite for the Scalable Fabrication of p-i-n Perovskite Solar Cells

Sashil Chapagain, Pakanati Chandrasekhar, Deborah McGott, Rosemary Bramante, Maikel van Hest, Matthew Reese, Thad Druffel, Craig Grapperhaus

Research output: Contribution to journalArticlepeer-review

12 Scopus Citations

Abstract

Tin(IV) oxide materials have been extensively used as electron transport materials in n-i-p perovskite solar cells (PSCs) due to their superior optoelectronic properties, low-temperature processability, and high chemical stability. However, solvent incompatibility and processing temperature have limited the direct deposition of fully solution-processed SnO2 in p-i-n devices. In this study, we overcome this limitation by the functionalization of SnO2 nanoparticles with acetate through ligand exchange, allowing their dispersion in anhydrous ethanol. The SnO2 dispersion was deposited on the perovskite absorber by blade coating without damaging the underlying perovskite layer, as determined by X-ray diffraction and scanning electron microscopy. Photoluminescence spectroscopy confirmed effective electron extraction. The champion device shows 14.1% initial power conversion efficiency (PCE) which is unprecedented for a p-i-n device employing solution-phase SnO2. PSCs stored for 40 days in a nitrogen flow box retained an average of 95.8% of the initial PCE.

Original languageAmerican English
Pages (from-to)10477-10483
Number of pages7
JournalACS Applied Energy Materials
Volume4
Issue number10
DOIs
StatePublished - 25 Oct 2021

Bibliographical note

Publisher Copyright:
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NREL Publication Number

  • NREL/JA-5K00-79726

Keywords

  • blade coating
  • electron transport material
  • metal oxide
  • perovskite solar cells
  • tin oxide

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