5.
F Wolf, M T Sirtl, S Klenk, M H H Wurzenberger, M Armer, P Dörflinger, P Ganswindt, R Guntermann, V Dyakonov, T Bein
Behind the scenes: insights into the structural properties of amide-based hole-transporting materials for lead-free perovskite solar cells Journal Article
In: CrystEngComm, vol. 25, no. 21, pp. 3142-3149, 0000.
Abstract | Links | Tags: Foundry Organic, Solid-Solid
@article{nokey,
title = {Behind the scenes: insights into the structural properties of amide-based hole-transporting materials for lead-free perovskite solar cells},
author = {F Wolf and M T Sirtl and S Klenk and M H H Wurzenberger and M Armer and P D\"{o}rflinger and P Ganswindt and R Guntermann and V Dyakonov and T Bein},
url = {http://dx.doi.org/10.1039/D2CE01512A},
doi = {10.1039/D2CE01512A},
journal = {CrystEngComm},
volume = {25},
number = {21},
pages = {3142-3149},
abstract = {State-of-the-art perovskite solar cells often employ expensive organic hole transporting materials (HTM) such as spiro-OMeTAD, motivating the search for potential alternatives. Here we report single-crystal data of EDOT-amide-TPA as well as the first utilization of EDOT-amide-TPA as HTM for Cs2AgBiBr6 perovskite solar cells, outperforming spiro-OMeTAD. The dense packing of the EDOT-amide-TPA film improves the charge carrier extraction, increasing the JSC and PCE.},
keywords = {Foundry Organic, Solid-Solid},
pubstate = {published},
tppubtype = {article}
}
State-of-the-art perovskite solar cells often employ expensive organic hole transporting materials (HTM) such as spiro-OMeTAD, motivating the search for potential alternatives. Here we report single-crystal data of EDOT-amide-TPA as well as the first utilization of EDOT-amide-TPA as HTM for Cs2AgBiBr6 perovskite solar cells, outperforming spiro-OMeTAD. The dense packing of the EDOT-amide-TPA film improves the charge carrier extraction, increasing the JSC and PCE.
4.
F Ye, T Tian, J Su, R Jiang, J Li, C Jin, J Tong, S Bai, F Huang, P Müller-Buschbaum, Y-B Cheng, T Bu
Tailoring Low-Dimensional Perovskites Passivation for Efficient Two-Step-Processed FAPbI3 Solar Cells and Modules Journal Article
In: Advanced Energy Materials, vol. n/a, no. n/a, pp. 2302775, 0000, ISSN: 1614-6832.
Abstract | Links | Tags: Foundry Organic, Solid-Solid
@article{nokey,
title = {Tailoring Low-Dimensional Perovskites Passivation for Efficient Two-Step-Processed FAPbI3 Solar Cells and Modules},
author = {F Ye and T Tian and J Su and R Jiang and J Li and C Jin and J Tong and S Bai and F Huang and P M\"{u}ller-Buschbaum and Y-B Cheng and T Bu},
url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/aenm.202302775},
doi = {https://doi.org/10.1002/aenm.202302775},
issn = {1614-6832},
journal = {Advanced Energy Materials},
volume = {n/a},
number = {n/a},
pages = {2302775},
abstract = {Abstract Converting PbI2 residues into low-dimensional perovskites through post-treatment with ammonium-based large cations can passivate 3D perovskites, thus has emerged as an effective strategy to improve the performance of perovskite solar cells (PSCs). Herein, a dramatically improved efficiency is demonstrated for PSCs based on a two-step-processed FAPbI3 perovskite via post-treatment with formamidinium (FA)-based benzamidine hydrochloride (PFACl), outperforming the commonly used methylamine (MA)-based benzylamine hydrochloride (PMACl). With an in-depth exploration of the crystal structures and morphology changes of the FAPbI3 perovskite upon the PFACl post-treatment, the preferential formation of 1D rather than 2D structures on the 3D perovskite film is identified. In contrast to the 2D counterpart, the more energetically favorable 1D structure enables a more effective elimination of PbI2 residues. As a consequence, the PFACl-induced 1D/3D perovskite film is endowed with smoother morphology, more uniform surface potential distribution, lower trap density, faster charge transfer, and better film stability than the PMACl-induced 2D/3D perovskite and control films, demonstrating champion efficiencies of 24.9% for a small-size PSC, 23.6% for a 1 cm2 large-size PSC, and 21.2% for a 5 × 5 cm2 mini-module, which is the highest among the perovskite solar mini-modules using the two-step deposition method.},
keywords = {Foundry Organic, Solid-Solid},
pubstate = {published},
tppubtype = {article}
}
Abstract Converting PbI2 residues into low-dimensional perovskites through post-treatment with ammonium-based large cations can passivate 3D perovskites, thus has emerged as an effective strategy to improve the performance of perovskite solar cells (PSCs). Herein, a dramatically improved efficiency is demonstrated for PSCs based on a two-step-processed FAPbI3 perovskite via post-treatment with formamidinium (FA)-based benzamidine hydrochloride (PFACl), outperforming the commonly used methylamine (MA)-based benzylamine hydrochloride (PMACl). With an in-depth exploration of the crystal structures and morphology changes of the FAPbI3 perovskite upon the PFACl post-treatment, the preferential formation of 1D rather than 2D structures on the 3D perovskite film is identified. In contrast to the 2D counterpart, the more energetically favorable 1D structure enables a more effective elimination of PbI2 residues. As a consequence, the PFACl-induced 1D/3D perovskite film is endowed with smoother morphology, more uniform surface potential distribution, lower trap density, faster charge transfer, and better film stability than the PMACl-induced 2D/3D perovskite and control films, demonstrating champion efficiencies of 24.9% for a small-size PSC, 23.6% for a 1 cm2 large-size PSC, and 21.2% for a 5 × 5 cm2 mini-module, which is the highest among the perovskite solar mini-modules using the two-step deposition method.
3.
H Zhang, T Luo, Y Chen, K Liu, H Li, E Pensa, J Fu, Z Lin, L Chai, E Cortés, M Liu
Highly Efficient Decomposition of Perfluorocarbons for over 1000 Hours via Active Site Regeneration Journal Article
In: Angewandte Chemie International Edition, vol. 62, no. 46, pp. e202305651, 0000, ISSN: 1433-7851.
Abstract | Links | Tags: Molecularly-Functionalized, Solid-Solid
@article{nokey,
title = {Highly Efficient Decomposition of Perfluorocarbons for over 1000 Hours via Active Site Regeneration},
author = {H Zhang and T Luo and Y Chen and K Liu and H Li and E Pensa and J Fu and Z Lin and L Chai and E Cort\'{e}s and M Liu},
url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/anie.202305651},
doi = {https://doi.org/10.1002/anie.202305651},
issn = {1433-7851},
journal = {Angewandte Chemie International Edition},
volume = {62},
number = {46},
pages = {e202305651},
abstract = {Abstract Tetrafluoromethane (CF4), the simplest perfluorocarbon (PFC), has the potential to exacerbate global warming. Catalytic hydrolysis is a viable method to degrade CF4, but fluorine poisoning severely restricts both the catalytic performance and catalyst lifetime. In this study, Ga is introduced to effectively assists the defluorination of poisoned Al active sites, leading to highly efficient CF4 decomposition at 600 °C with a catalytic lifetime exceeding 1,000 hours. 27Al and 71Ga magic-angle spinning nuclear magnetic resonance spectroscopy (MAS NMR) showed that the introduced Ga exists as tetracoordinated Ga sites (GaIV), which readily dissociate water to form Ga−OH. In situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and density function theory (DFT) calculations confirmed that Ga−OH assists the defluorination of poisoned Al active sites via a dehydration-like process. As a result, the Ga/Al2O3 catalyst achieved 100 % CF4 decomposition keeping an ultra-long catalytic lifetime and outperforming reported results. This work proposes a new approach for efficient and long-term CF4 decomposition by promoting the regeneration of active sites.},
keywords = {Molecularly-Functionalized, Solid-Solid},
pubstate = {published},
tppubtype = {article}
}
Abstract Tetrafluoromethane (CF4), the simplest perfluorocarbon (PFC), has the potential to exacerbate global warming. Catalytic hydrolysis is a viable method to degrade CF4, but fluorine poisoning severely restricts both the catalytic performance and catalyst lifetime. In this study, Ga is introduced to effectively assists the defluorination of poisoned Al active sites, leading to highly efficient CF4 decomposition at 600 °C with a catalytic lifetime exceeding 1,000 hours. 27Al and 71Ga magic-angle spinning nuclear magnetic resonance spectroscopy (MAS NMR) showed that the introduced Ga exists as tetracoordinated Ga sites (GaIV), which readily dissociate water to form Ga−OH. In situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and density function theory (DFT) calculations confirmed that Ga−OH assists the defluorination of poisoned Al active sites via a dehydration-like process. As a result, the Ga/Al2O3 catalyst achieved 100 % CF4 decomposition keeping an ultra-long catalytic lifetime and outperforming reported results. This work proposes a new approach for efficient and long-term CF4 decomposition by promoting the regeneration of active sites.
2.
H Zheng, H Hu, T Weber, J Wang, L Nan, B Zou, S A Maier, A Tittl
All-Dielectric Structural Coloration Empowered by Bound States in the Continuum Journal Article
In: arXiv preprint arXiv:2311.13315, 0000.
Abstract | Links | Tags: Molecularly-Functionalized, Solid-Solid
@article{nokey,
title = {All-Dielectric Structural Coloration Empowered by Bound States in the Continuum},
author = {H Zheng and H Hu and T Weber and J Wang and L Nan and B Zou and S A Maier and A Tittl},
url = {https://arxiv.org/abs/2311.13315},
doi = {https://doi.org/10.48550/arXiv.2311.13315},
journal = {arXiv preprint arXiv:2311.13315},
abstract = {The technological requirements of low-power and high-fidelity color displays have been instrumental in driving research into advanced coloration technologies. At the forefront of these developments is the implementation of dye-free coloration techniques, which overcome previous constraints related to insufficient resolution and color fading. In this context, resonant dielectric nanostructures have emerged as a promising paradigm, showing great potential for high efficiency, remarkably high color saturation, wide gamut palette, and realistic image reproduction. However, they still face limitations related to color accuracy, purity, and simultaneous brightness tunability. Here, we demonstrate an all-dielectric metasurface empowered by photonic bound states in the continuum (BICs), which supports sharp resonances throughout the visible spectral range, ideally suited for producing a wide range of structural colors. The metasurface design consists of titanium dioxide (TiO2) ellipses with carefully controlled sizes and geometrical asymmetry, allowing versatile and on-demand variation of the brightness and hue of the output colors, respectively.},
keywords = {Molecularly-Functionalized, Solid-Solid},
pubstate = {published},
tppubtype = {article}
}
The technological requirements of low-power and high-fidelity color displays have been instrumental in driving research into advanced coloration technologies. At the forefront of these developments is the implementation of dye-free coloration techniques, which overcome previous constraints related to insufficient resolution and color fading. In this context, resonant dielectric nanostructures have emerged as a promising paradigm, showing great potential for high efficiency, remarkably high color saturation, wide gamut palette, and realistic image reproduction. However, they still face limitations related to color accuracy, purity, and simultaneous brightness tunability. Here, we demonstrate an all-dielectric metasurface empowered by photonic bound states in the continuum (BICs), which supports sharp resonances throughout the visible spectral range, ideally suited for producing a wide range of structural colors. The metasurface design consists of titanium dioxide (TiO2) ellipses with carefully controlled sizes and geometrical asymmetry, allowing versatile and on-demand variation of the brightness and hue of the output colors, respectively.
1.
X Zi, Y Zhou, L Zhu, Q Chen, Y Tan, X Wang, M Sayed, E Pensa, R A Geioushy, K Liu, J Fu, E Cortés, M Liu
Breaking K+ Concentration Limit on Cu Nanoneedles for Acidic Electrocatalytic CO2 Reduction to Multi-Carbon Products Journal Article
In: Angewandte Chemie International Edition, vol. 62, no. 42, pp. e202309351, 0000, ISSN: 1433-7851.
Abstract | Links | Tags: Molecularly-Functionalized, Solid-Solid
@article{nokey,
title = {Breaking K+ Concentration Limit on Cu Nanoneedles for Acidic Electrocatalytic CO2 Reduction to Multi-Carbon Products},
author = {X Zi and Y Zhou and L Zhu and Q Chen and Y Tan and X Wang and M Sayed and E Pensa and R A Geioushy and K Liu and J Fu and E Cort\'{e}s and M Liu},
url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/anie.202309351},
doi = {https://doi.org/10.1002/anie.202309351},
issn = {1433-7851},
journal = {Angewandte Chemie International Edition},
volume = {62},
number = {42},
pages = {e202309351},
abstract = {Abstract Electrocatalytic CO2 reduction reaction (CO2RR) to multi-carbon products (C2+) in acidic electrolyte is one of the most advanced routes for tackling our current climate and energy crisis. However, the competing hydrogen evolution reaction (HER) and the poor selectivity towards the valuable C2+ products are the major obstacles for the upscaling of these technologies. High local potassium ions (K+) concentration at the cathode's surface can inhibit proton-diffusion and accelerate the desirable carbon-carbon (C−C) coupling process. However, the solubility limit of potassium salts in bulk solution constrains the maximum achievable K+ concentration at the reaction sites and thus the overall acidic CO2RR performance of most electrocatalysts. In this work, we demonstrate that Cu nanoneedles induce ultrahigh local K+ concentrations (4.22 M) \textendash thus breaking the K+ solubility limit (3.5 M) \textendash which enables a highly efficient CO2RR in 3 M KCl at pH=1. As a result, a Faradaic efficiency of 90.69±2.15 % for C2+ (FEC2+) can be achieved at 1400 mA.cm−2, simultaneous with a single pass carbon efficiency (SPCE) of 25.49±0.82 % at a CO2 flow rate of 7 sccm.},
keywords = {Molecularly-Functionalized, Solid-Solid},
pubstate = {published},
tppubtype = {article}
}
Abstract Electrocatalytic CO2 reduction reaction (CO2RR) to multi-carbon products (C2+) in acidic electrolyte is one of the most advanced routes for tackling our current climate and energy crisis. However, the competing hydrogen evolution reaction (HER) and the poor selectivity towards the valuable C2+ products are the major obstacles for the upscaling of these technologies. High local potassium ions (K+) concentration at the cathode's surface can inhibit proton-diffusion and accelerate the desirable carbon-carbon (C−C) coupling process. However, the solubility limit of potassium salts in bulk solution constrains the maximum achievable K+ concentration at the reaction sites and thus the overall acidic CO2RR performance of most electrocatalysts. In this work, we demonstrate that Cu nanoneedles induce ultrahigh local K+ concentrations (4.22 M) – thus breaking the K+ solubility limit (3.5 M) – which enables a highly efficient CO2RR in 3 M KCl at pH=1. As a result, a Faradaic efficiency of 90.69±2.15 % for C2+ (FEC2+) can be achieved at 1400 mA.cm−2, simultaneous with a single pass carbon efficiency (SPCE) of 25.49±0.82 % at a CO2 flow rate of 7 sccm.