Improving Low-Bandgap Tin-Lead Perovskite Solar Cells via Contact Engineering and Gas Quench Processing

Jeremie Werner, Taylor Moot, Tyler Gossett, Isaac Gould, Axel Palmstrom, Eli Wolf, Caleb Boyd, Maikel van Hest, Joseph Luther, Joseph Berry, Michael McGehee

Research output: Contribution to journalArticlepeer-review

75 Scopus Citations

Abstract

Low-bandgap Sn/Pb ABX3 perovskites have reached photovoltaic power conversion efficiencies >20%, but they usually have poor stability due to the common use of acidic poly(3,4-ethylenedioxythiophene):polystyrenesulfonate (PEDOT:PSS) hole transport layers and A-site cation compositions containing methylammonium (MA). Here, we develop a process to enable high-quality MA-free Sn/Pb perovskite films grown using a gas quenching process instead of the conventional antisolvents, which provides improved control of the film growth and eliminates wrinkling. Using this method in a device structure with poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine] (PTAA) instead of PEDOT:PSS as the hole transport layer, devices can reach efficiencies up to 20%mppt at 0.06 cm2 and up to 17.5%mppt at 1 cm2 active area. With these improvements, the devices are characterized for thermal stability and show 80% of the initial power output remaining after 4000 h at 85 °C.

Original languageAmerican English
Pages (from-to)1215-1223
Number of pages9
JournalACS Energy Letters
Volume5
Issue number4
DOIs
StatePublished - 10 Apr 2020

Bibliographical note

Publisher Copyright:
© 2020 American Chemical Society.

NREL Publication Number

  • NREL/JA-5K00-76189

Keywords

  • film growth
  • gas quenching
  • perovskites
  • power conversion efficiency

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