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

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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.

Detaljer

Författare
Enheter & grupper
Externa organisationer
  • Fudan University
  • South Valley University
  • Technical University of Denmark
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Materialkemi
  • Nanoteknik

Nyckelord

Originalspråkengelska
Artikelnummer1905081
TidskriftSmall
Volym15
Utgåva nummer49
Tidigt onlinedatum2019 okt 22
StatusPublished - 2019
PublikationskategoriForskning
Peer review utfördJa