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Engineering two-/three- dimensional (2D/3D) perovskite solar cells is nowadays a popular strategy for efficient and stable devices 1-3. However, the exact function of the 2D/3D interface in controlling the long-term device behavior is still obscure.
Here, we reveal a dynamical structural mutation
of the 2D/3D interface: the small cations in the 3D cage move towards the 2D
layer, which acts as an ion scavenger. If structurally stable, the 2D physically blocks
the ion movement at the interface boosting the device stability. Otherwise, the
2D embeds them, dynamically self-transforming into a quasi-2D structure. 2
2D perovskite acts as a sheath to physically
protect the 3D underneath. In concomitance, we discovered that the stable 2D
perovskite can block ion movement, improving the interface stability on a slow
time scale. 2,4
The judicious choice of the 2D constituents is
decisive to control the 2D/3D kinetics and improve the device lifetime, opening
a new avenue for perovskite interface design.
References
[1] J.-P. Correa-Baena et al., Science 358, 739–744 (2017).
[2] A. Sutanto et al. J. Mater. Chem.
A 8, 2343-2348 (2020).
[3] V. Queloz et al. J. Phys. Chem. Lett. 10,
19, 5713-5720 (2019).
[4] A. Sutanto et al. Nano Lett 20, 3992-3998
(2020)
Acknowledgements I
acknowledge the “HY-NANO” project that has received funding from the European
Research Council (ERC) Starting Grant 2018 under the European Union’s Horizon
2020 research and innovation programme (Grant agreement No. 802862).
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