Temperature-Dependent Carrier Extraction and the Effects of Excitons on Emission and Photovoltaic Performance in Cs0.05FA0.79MA0.16Pb(I0.83Br0.17)3 Solar Cells

Hadi Afshari, Brandon Durant, Ahmad Kirmani, Sergio Chacon, John Mahoney, Vincent Whiteside, Rebecca Scheidt, Matthew Beard, Joseph Luther, Ian Sellers

Research output: Contribution to journalArticlepeer-review

5 Scopus Citations

Abstract

The photovoltaic parameters of triple cation perovskite [Cs0.05FA0.79MA0.16Pb(I0.83Br0.17)3] solar cells are investigated focusing on the electro-optical properties and differences in performance at low and high temperatures. The signature of a parasitic barrier to carrier extraction is observed at low temperatures, which results in a loss of performance at T < 200 K. Intensity-dependent measurements indicate extraction across this parasitic interface is limited by a combination of the exciton binding energy and thermionic emission. However, the photovoltaic performance of the device is recovered at low intensity - where the photocarrier generation rate threshold is lower than the thermionic extraction rate. Loss of solar cell performance is also observed to be strongly correlated to an increase in photoluminescence intensity, indicating inhibited carrier extraction results in strong radiative recombination and that these systems do not appear to be limited by significant thermally activated non-radiative processes. Evidence of limited carrier extraction due to excitonic effects is also observed with a strong anti-correlation in photoluminescence and carrier extraction observed at lower temperatures.
Original languageAmerican English
Pages (from-to)44358-44366
Number of pages9
JournalACS Applied Materials and Interfaces
Volume14
Issue number39
DOIs
StatePublished - 2022

NREL Publication Number

  • NREL/JA-5900-83378

Keywords

  • barrier
  • carrier extraction
  • excitons
  • low temperatures
  • perovskites
  • solar cell

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