Also called Ruddlesden–Popper perovskites, Dion–Jacobson perovskites, (BA)₂PbI₄
Crystals that build their own quantum wells: sheets of lead halide separated by layers of organic molecules. They absorb and emit light strongly, and the organic spacers make them far more resistant to moisture than the 3D perovskites used in record solar cells – which is why thin 2D perovskite layers are now routinely added to perovskite solar cells to make them last longer.
They are coordination polyhedra. Only complete ones are drawn.
Three layers of (C4H9NH3)2PbI4. Each layer is turned by 180° and shifted against the one below, and the butyl chains of neighbouring layers meet tail to tail in the gap, held together only by van der Waals forces: 13.80 Å between layers. Cell at 293 K from Billing and Lemmerer, Acta Crystallographica B 63, 735 (2007); COD 2102938, hydrogen left out as in the single layer.
Readiness runs lab → prototype → pilot → deployed.
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Hybrid organic–inorganic structures need large cells and dynamic disorder. Spin–orbit coupling from lead is essential – it lowers the gap by roughly 1 eV – and dielectric confinement from the low-permittivity organic layers boosts exciton binding far beyond simple quantum-well estimates. Octahedral tilts and cation dynamics call for ab initio molecular dynamics; exciton–phonon coupling calls for polaron models.
Determine n from low-angle XRD reflections and from the distinct excitonic absorption peak of each n – PL often reveals mixed phases that XRD misses. Control and report humidity during processing, and keep laser power densities low, since exfoliated flakes degrade under intense illumination.
Already useful as a thin additive in perovskite photovoltaics under commercial development. As a stand-alone absorber its wide gap and poor out-of-plane transport limit efficiency; lead handling and long-term field stability remain central concerns.
The newest items tagged 2D perovskites, from the news feed updated 5 Oct 2026.
As our technology advances, the demand for more functional semiconductor materials has grown. In layered hybrid perovskites, an enhanced functionality can be achieved by introducing molecular switches as spacers. These spacers permit the reversible modulation of the semiconductor properties, which can, for example…
The discovery of superconductivity in Ruddlesden-Popper bilayer nickelates under both high pressure and ambient conditions has opened a new paradigm for exploring unconventional superconductivity. This review provides a brief survey of theoretical progress on bilayer nickelate superconductors. Drawing from the key…
Inspired by the possibility that superconducting properties may be altered by applying a perpendicular electric field in the Ruddlesden-Popper (RP) bilayer nickelate La3Ni2O7 thin film, we investigated the imbalanced two-orbital bilayer Hubbard model with … [Phys. Rev. B 114, 165115] Published Fri Sep 11, 2026
Interlayer excitons in two dimensional material heterostructures exhibit large exciton binding energies and long lifetimes, making them ideal platforms for studying excitonic devices and many body quantum phenomena. However, the spatially separated electron and hole nature of IXs reduces their oscillator strength by…
Electron phonon coupling governs charge transport, carrier relaxation, and polaron formation in halide perovskites, yet its microscopic origin in low dimensional systems remains poorly understood. Here, we combine operando, bias dependent Raman spectroscopy with density functional theory (DFT) calculations to directly…
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