Proceedings of International Conference on Perovskite Thin Film Photovoltaics and Perovskite Photonics and Optoelectronics (NIPHO24)
Publication date: 25th April 2024
2D Ruddlesden-Popper perovskite phases in solar cells have been exploited in combination with polycrystalline (PC) 3D HPs as ultrathin passivation layers to improve stability and charge extraction. Most of 3D/2D heterostructures reported so far are made by PC thin films grown on top of PC 3D HPs, with little control over orientation and crystalline phase, thus creating high concentration of defects at grain boundaries and interfaces, which favors the presence of traps for charge carriers, ion migration and water permeation.
On the other hand, pure 2D HPs in solar cells have been considered less suitable for photovoltaics due to their large exciton binding energies which should hinder charge separation by a significant energy loss. Surprisingly, the presence of large polarons, that is charge carriers coupled to lattice deformations, inhibits the formation of excitons and appears to be the microscopic mechanism enabling efficient 2D HPs solar cells [1,2].
The use of single crystal (SC) HPs both for 2D/3D heterostructures and pure 2D film devices is still challenging and their performance is even lower than PC devices due to the high density of traps at the crystal surface.
Here we explore single crystal perovskite 2D perovskites and 2D/3D heterostructures. Growth of 2D HPs single crystal thin films is shown with several additives and their optical and structural properties are studied. Single crystal 2D/3D thin film heterostructures are also shown and various strategies for interface engineering are proposed. A critical comparison of the photophysics and transport properties of single crystal and polycrystalline samples is also shown.
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