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2023 - Advanced Materials


D. Gao, R. Li, X. Chen, C. Chen, C. Wang, B. Zhang, M. Li, X. Shang, X. Yu, S. Gong, Th. Pauporté, H. Yang, L. Ding, J. Tang, and J. Chen

Managing Interfacial Defects and Carriers by Synergistic Modulation of Functional Groups and Spatial Conformation for High-Performance Perovskite Photovoltaics Based on Vacuum Flash Method.

Advanced Materials, (2023), 2301028.

Here, one effective interfacial defect and carrier dynamics management strategy by synergistic modulation of functional groups and spatial conformation of ammonium salt molecules is proposed. The surface treatment with 3-ammonium propionic acid iodide (3-APAI) does not form 2D perovskite passivation layer while the propylammonium ions and 5-aminopentanoic acid hydroiodide post-treatment lead to the formation of 2D perovskite passivation layers. 3-APAI surface treatment in association with vacuum flash technology was used in particular and enable to obtain PSCs with an alluring peak efficiency of 24.72%


2023 - Nanomaterials

L. Gollino, N. Mercier, Th. Pauporté

Exploring Solar Cells Based on Lead- and Iodide-Deficient Halide Perovskite (d-HP) Thin Films.

Nanomaterials, (2023), 13(7), 1245.


We propose one way to reduce lead content on perosvkite solar cells while improving their stability. We optimized a new family of 3D perovskites, called d-HPs, presenting PbI+ unit vacancies inside the lattice caused by the insertion of big organic cations that do not respect the Goldschmidt tolerance factor: hydroxyethylammonium (HEA+) and thioethylammonium (TEA+). For d-MAPbI3-HEA, the power conversion efficiency (PCE) reached 11.47% while displaying enhanced stability and reduced lead content compared to MAPI while d-FAPbI3-TEA delivered a PCE of 8.33% with astounding perovskite film stability compared to classic α-FAPI.

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2022 - NATURE Communications


D. Zheng, F. Raffin, P. Volovitch, Th. Pauporté

Control of perovskite film crystallization and growth direction to target homogeneous monolithic structures.

Nature Commun., 13 (2022) 6655. 

Here we show how the initial solution composition affects, first, the film formed by spin coating and anti-solvent dripping and, second, the processes occurring upon thermal annealing, including crystal domain evolution and the grain growth mechanism. We propose a universal typology which distinguishes three types for the growth direction of perovskite crystals: downward (Type I), upward (Type II) and lateral (Type III). The latter results in large, monolithic grains and we show that this mode must be targeted for the preparation of efficient perovskite light absorber thin films of solar cells.

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