Electrochemistry Techniques Series

Overcoming the stability of halide perovskite: the rise of two-dimensional halide perovskites

March 18, 2025

Two-dimensional (2D) halide perovskites were a sub-class of 3D perovskites, which had emerged as a new class of solution-processed organic-inorganic (hybrid) low-dimensional semiconductors. They imbibed their properties from four exciting classes of novel materials - quantum wells, atomically thin 2D materials, organic semiconductors, and 3D halide perovskites. There was growing consensus that their physical properties were dictated by the interaction between the organic cation and the inorganic framework, which presented a unique opportunity to tailor their behaviours. Moreover, the 2D perovskites had demonstrated technologically relevant durability in contrast to the 3D perovskites, and their synergistic integration with 3D perovskites had demonstrated the path for overcoming the issue of long-term durability in halide perovskite-based optoelectronic devices.

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In this talk, the speaker described their work over the past five years on 2D perovskites ranging from novel fundamental light-induced structural behaviors and its impact on charge transport, solvation dynamics to control homogeneity of layer thickness and the synergy between 2D and 3D perovskites in achieving durable and high-efficiency photovoltaic devices. The speaker also presented some new results, which offered an exciting prospect for developing arrays of electrically driven single photon emitters.

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Key references:

1. Metcalf et al Two-dimensional perovskite templates for durable and efficient formamidinium solar cells Science 2024.

2. Sidhik et al Deterministic fabrication of 3D/2D perovskite bilayer stacks for durable and efficient solar cells Science 2022 Vol 377, Issue 6613 pp. 1425-1430

3. Li W et al Light-activated interlayer contraction in two-dimensional perovskites for high- efficiency solar cells. Nat Nanotechnol. 2022 Jan;l 7(1):45-52.

4. Sidhik et al Memory Seeds Enable High Structural Phase Purity in 2D Perovskite Films for High- Efficiency Devices. Adv Mater. 2021 Jul;33(29):e2007176.

5. Blancon JC et al, Semiconductor physics of organic-inorganic 2D halide perovskites. Nature Nanotechnol. 2020 Dec; 15(12):969-985.

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The event has been recorded and is available on our gallery page or by clicking the button below.