Controlled redox of lithium-ion endohedral fullerene for efficient and stable metal electrode-free perovskite solar cells

Il Jeon*, Ahmed Shawky, Hao Sheng Lin, Seungju Seo, Hiroshi Okada, Jin Wook Lee, Amrita Pal, Shaun Tan, Anton Anisimov, Esko I. Kauppinen, Yang Yang, Sergei Manzhos, Shigeo Maruyama, Yutaka Matsuo

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

26 Citations (Scopus)

Abstract

High efficiency perovskite solar cells has underpinned the rapid growth of the field. However, their low device stability limits further ad-vancement. Hygroscopic lithium bis(trifluoromethanesulfonyl)imide (Li+TFSI-) and metal electrode are the main causes of the device instability. In this work, the redox reaction between lithium-ion endohedral fullerenes and 2,2′,7,7′-tetrakis(N,N-di-p-methoxyphenylamine)-9,9′-spirobi-fluorene (spiro-MeOTAD) was controlled to optimize the amount of oxidized spiro-MeOTAD and antioxidizing neutral endohedral fullerenes. Application of this mixture to metal-free carbon nanotube (CNT)-laminated perovskite solar cells resulted in 17.2% efficiency with a stability time of more than 1100 hours under severe condition (temperature = 60ºC, humidity = 70%). Such high performance is attributed to the uninhibited charge flow, no metal-ion migration, and the enhanced anti-oxidizing ac-tivity of the devices.

Original languageEnglish
Pages (from-to)16553-16558
JournalJournal of the American Chemical Society
Volume141
Issue number42
Early online date1 Jan 2019
DOIs
Publication statusPublished - 17 Jul 2019
MoE publication typeA1 Journal article-refereed

Keywords

  • Carbon Nanotube
  • Endohedral Fullerene
  • Metallofullerene
  • Perovskite Solar Cells
  • Stability of Solar Cells

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