Dynamic Phenomena at Perovskite/Electron-Selective Contact Interface as Interpreted from Photovoltage Decays

Ronen Gottesman, Pilar Lopez-Varo, Laxman Gouda, Juan A. Jimenez-Tejada, Jiangang Hu, Shay Tirosh, Arie Zaban*, Juan Bisquert

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

150 Scopus citations

Abstract

Drastic changes in open-circuit voltage decay (OCVD) response time in CH3NH3PbX3 perovskites have been systematically investigated in order to elucidate the dynamic properties of the interface. Under pre-illumination treatment, the decay times are reduced by orders of magnitude, but if left to rest for sufficient time, the solar cell evolves to its original decay kinetics. In order to explain these observations, we developed advanced modeling of the perovskite solar cell to obtain a realistic description of the immediate vicinity of the interface, including ionic variable concentration and accumulation of holes via degenerate statistics in the space charge region. The results reveal a large amount of majority carriers at the minority carrier extraction contact, assisted by additional ionic charge. The surface band bending related to accumulation gives an electrostatic contribution to the photovoltage in a manner governed by slow dynamics of cations at the electron-selective contact. The modeling of the interface allows us to describe the dynamics of the contact region dominated by surface charging and recombination. These phenomena also play an important role in operation conditions and current-voltage scans of the solar cell.

Original languageAmerican English
Pages (from-to)776-789
Number of pages14
JournalChem
Volume1
Issue number5
DOIs
StatePublished - 10 Nov 2016
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2016 Elsevier Inc.

Keywords

  • charge accumulation
  • interface design
  • memory effect
  • open-circuit voltage decay
  • perovskite solar cells
  • photo-induced changes
  • selective contact

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