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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

Regulating Reorganization Energy and Crystal Packing of Small-Molecule Donors Enables High Performance Binary All-Small-Molecule Organic Solar Cells with Slow Film Growth Rate

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.

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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 - Advanced Functional Materials

 

T. Wang, D. Zheng, K. Vegso, Nada Mrkyvkova, P. Siffalovic, Th. Pauporté

High-Resolution and Stable Ruddlesden-Popper Quasi-2D Perovskite Flexible Photodetectors Arrays for Potential Applications as Optical Image Sensor

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.

High-Resolution and Stable Ruddlesden–Popper Quasi-2D Perovskite Flexible Photodetectors A

2023 - Exploration

 

D. Zheng, T. Pauporté, C. Schwob, L. Coolen

Models of light absorption enhancement in perovskite solar cells by plasmonic nanoparticles

Exploration, (2023), 20220146.

In this paper, we analyze the experimental literature on plasmonic perovskite solar cells in light of our theoretical description. We estimate that only a small portion of these reports can be associated with light absorption and point out the importance of reporting the perovskite thickness and nanoparticle concentration in order to assess the presence of plasmonic effects like LSPR.

Models of light absorption enhancement in perovskite solar cells by plasmonic nanoparticle

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%

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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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