THE PAUPORTÉ GROUP
Optoelectronics, Photovoltaics and Nanostructures
Institut de Recherche de Chimie Paris -
Chimie ParisTech - CNRS
2024 - Energy & Environmental Science
B. Zhang, H. Zeng, H. Yin, D. Zheng, Z. Wan, C. Jia, T. Stuyver, J. Luo, Th. Pauporté
Energy Environ. Sci., 2024, Advance Article
In this work, we unveil a paradigm shift in PSCs optimization. Through a judicious selection from a repertoire of 60 perovskite variants, we identified a composition with exemplary optical, thermal and electrical stability. Employing Bayesian machine learning, we navigated a labyrinth of over 1 billion process conditions, culminating in a record-breaking efficiency within a mere 80 iterations. Finally, the integration of bespoke in situ polymerized ionic molecules allowed us to further augment performance of inverted PSCs, reaching an unparalleled power conversion efficiency of 25.76% (certified at 25.21%). The PSCs retained 94% of the initial efficiency after continuous operation in a nitrogen atmosphere at 65 °C for 1920 hours. This work not only redefines the benchmarks for PSCs but also illuminates the path forward for photovoltaic innovations.
2024 - advanced material interfaces
M. Liu, D. Zheng, T. Pauporté*
Adv. Mater. Interfaces 11 (2024) 2300773
In this paper, the use of methylammonium chloride (MACl) and an excess of PbI2 is introduced as a co-additives in the precursor solution for the control of phenylmethylammonium or benzylammonium (PMA+ spacer) and formamidinium (FA+)-based quasi-2D PMA2FAn−1PbnI3n+1 (n = 5) perovskite layers formation. By this method, the morphology of the layer, the inner phase distribution, and the charge transport properties are improved.
2023 - Energy & Environmental Science
T . Xu, J. Lv, D. Zheng, Z. Luo, M. H. Jee, G. Ran, Z. Chen, Z. Huang, Y. Li, C. Zhang, H. Hu, T. Pauporté, W. Zhang, H. Y. Woo, and C. Yang
Energy Environ. Sci., 2023,16, 5933-5943
Herein, we have developed three small-molecule donors (T25, T26 and T27) through stepwise terminal-group and side-chain engineering. For the first time in the ASM-OSCs, we have analyzed the relationship between the material's structure, film formation mechanism and device performance by combining single crystal structure analysis and glow discharge optical emission spectroscopy (GD-OES) measurements.
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
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 - Advanced Functional Materials
T. Wang, D. Zheng, K. Vegso, Nada Mrkyvkova, P. Siffalovic, Th. Pauporté
Advanced Functional Materials, (2023), 2304659.
The development of an efficient fabrication route to achieve high-resolution perovskite pixel array is key for large-scale flexible image sensor devices. Herein, a high-resolution and stable 10 × 10 flexible PDs array based on formamidinium(FA+) and phenylmethylammonium (PMA+) quasi-2D (PMA)2FAPb2I7 (n = 2) perovskite is demonstrated by developing SiO2-assisted hydrophobic and hydrophilic treatment process on polyethylene terephthalate substrate. By introducing Au nanoparticles (Au NPs), the perovskite film quality is improved and grain boundaries are reduced. The mechanism by which Au NPs upgrade the photoelectric quality of perovskite is mainly revealed by glow discharge-optical emission spectroscopy (GD-OES) and grazing-incidence wide-angle X-ray scattering (GIWAXS). To further improve the photoelectric performance of the devices, a post-treatment strategy with formamidinium chloride (FACl) is used.
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
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%
2022 - NATURE Communications
D. Zheng, F. Raffin, P. Volovitch, Th. Pauporté
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.