3D Perovskite Passivation with a Benzotriazole-Based 2D Interlayer for High-Efficiency Solar Cells

Alessandro Caiazzo, Arthur Maufort, Bas T. van Gorkom, Willemijn H.M. Remmerswaal, Jordi Ferrer Orri, Junyu Li, Junke Wang, Wouter T.M. van Gompel, Kristof Van Hecke, Gunnar Kusch, R.A. Oliver, Caterina Ducati, Laurence Lutsen, Martijn M. Wienk, Samuel D. Stranks, Dirk Vanderzande, René A.J. Janssen (Corresponding author)

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

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2H-Benzotriazol-2-ylethylammonium bromide and iodide and its difluorinated derivatives are synthesized and employed as interlayers for passivation of formamidinium lead triiodide (FAPbI3) solar cells. In combination with PbI2 and PbBr2, these benzotriazole derivatives form two-dimensional (2D) Ruddlesden-Popper perovskites (RPPs) as evidenced by their crystal structures and thin film characteristics. When used to passivate n-i-p FAPbI3 solar cells, the power conversion efficiency improves from 20% to close to 22% by enhancing the open-circuit voltage. Quasi-Fermi level splitting experiments and scanning electron microscopy cathodoluminescence hyperspectral imaging reveal that passivation provides a reduced nonradiative recombination at the interface between the perovskite and hole transport layer. Photoluminescence spectroscopy, angle-resolved grazing-incidence wide-angle X-ray scattering, and depth profiling X-ray photoelectron spectroscopy studies of the 2D/three-dimensional (3D) interface between the benzotriazole RPP and FAPbI3 show that a nonuniform layer of 2D perovskites is enough to passivate defects, enhance charge extraction, and decrease nonradiative recombination.

Originele taal-2Engels
Pagina's (van-tot)3933–3943
Aantal pagina's11
TijdschriftACS Applied Energy Materials
Nummer van het tijdschrift7
StatusGepubliceerd - 10 apr. 2023

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Publisher Copyright:
© 2023 The Authors. Published by American Chemical Society.


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