Efficient Charge Extraction and Slow Recombination in Organic-Inorganic Perovskites Capped with Semiconducting Single-Walled Carbon Nanotubes

Jeffrey Blackburn, Rachelle Ihly, Anne-Marie Dowgiallo, Mengjin Yang, Obadiah Reid, Andrew Ferguson, Kai Zhu, Joseph Berry, Noah Stanton

Research output: Contribution to journalArticlepeer-review

120 Scopus Citations

Abstract

Metal-halide based perovskite solar cells have rapidly emerged as a promising alternative to traditional inorganic and thin-film photovoltaics. Although charge transport layers are used on either side of perovskite absorber layers to extract photogenerated electrons and holes, the time scales for charge extraction and recombination are poorly understood. Ideal charge transport layers should facilitate large discrepancies between charge extraction and recombination rates. Here, we demonstrate that highly enriched semiconducting single-walled carbon nanotube (SWCNT) films enable rapid (sub-picosecond) hole extraction from a prototypical perovskite absorber layer and extremely slow back-transfer and recombination (hundreds of microseconds). The energetically narrow and distinct spectroscopic signatures for charges within these SWCNT thin films enables the unambiguous temporal tracking of each charge carrier with time-resolved spectroscopies covering many decades of time. The efficient hole extraction by the SWCNT layer also improves electron extraction by the compact titanium dioxide electron transport layer, which should reduce charge accumulation at each critical interface. Finally, we demonstrate that the use of thin interface layers of semiconducting single-walled carbon nanotubes between the perovskite absorber layer and a prototypical hole transport layer improves device efficiency and stability, and reduces hysteresis.

Original languageAmerican English
Pages (from-to)1439-1449
Number of pages11
JournalEnergy and Environmental Science
Volume9
Issue number4
DOIs
StatePublished - Apr 2016

Bibliographical note

Publisher Copyright:
© 2016 The Royal Society of Chemistry.

NREL Publication Number

  • NREL/JA-5900-65687

Keywords

  • back-transfer
  • perovskite absorber layer
  • rapid hole extraction
  • recombination
  • semiconducting single-walled carbon nanotube (SWCNT)
  • solar-photochemistry

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