Nonconfinement Structure Revealed in Dion-Jacobson Type Quasi-2D Perovskite Expedites Interlayer Charge Transport

Shuang Yu, Yajie Yan, Mohamed Abdellah, Tõnu Pullerits, Kaibo Zheng*, Ziqi Liang

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Dion-Jacobson (DJ) type 2D perovskites with a single organic cation layer exhibit a narrower distance between two adjacent inorganic layers compared to the corresponding Ruddlesden-Popper perovskites, which facilitates interlayer charge transport. However, the internal crystal structures in 2D DJ perovskites remain elusive. Herein, in a p-xylylenediamine (PDMA)-based DJ perovskite bearing bifunctional NH3 + spacer, the compression from confinement structure (inorganic layer number, n = 1, 2) to nonconfinement structure (n > 3) with the decrease of PDMA molar ratio is unraveled. Remarkably, the nonconfined perovskite displays shorter spacing between 2D quantum wells, which results in a lower exciton binding energy and hence promotes exciton dissociation. The significantly diminishing quantum confinement promotes interlayer charge transport leading to a maximum photovoltaic efficiency of ≈11%. Additionally, the tighter interlayer packing arising from the squeezing of inorganic octahedra gives rise to enhanced ambient stability.
Original languageEnglish
Article numbere1905081
JournalSmall
Volume15
Issue number49
Number of pages7
ISSN1613-6810
DOIs
Publication statusPublished - 2019

Keywords

  • Dion-Jacobson
  • Excitons
  • Nonconfinement structures
  • Planar perovskite solar cells
  • Quasi-2D perovskite

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