@article{,
title = {Multidimensional Morphology Control for PS-b-P4VP Templated Mesoporous Iron (III) Oxide Thin Films},
author = {S Yin and W Cao and Q Ji and Y Cheng and L Song and N Li and C L Weindl and M Schwartzkopf and S V Roth and P M\"{u}ller-Buschbaum},
url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/admi.202100141},
doi = {https://doi.org/10.1002/admi.202100141},
issn = {2196-7350},
year = {2021},
date = {2021-06-12},
journal = {Advanced Materials Interfaces},
volume = {n/a},
number = {n/a},
pages = {2100141},
abstract = {Abstract Mesoporous α-Fe2O3 thin films with large area homogeneity demonstrate tremendous potential in multiple applications. In the present work, the synthesis of morphology-controlled α-Fe2O3 thin films is realized with polystyrene-block-poly(4-vinyl pyridine) (PS-b-P4VP) diblock copolymer assisted sol-gel chemistry. The solvent category (DMF and 1,4-dioxane) and polymer-to-FeCl3 ratio used for the solution preparation are systematically varied to tune the morphology of the thin films. For both solvents, DMF and 1,4-dioxane, nanocluster structures are obtained with low PS-b-P4VP concentration. When the concentration of PS-b-P4VP reaches the critical micelle concentration, spherical and wormlike porous structures are specifically formed in the DMF and 1,4-dioxane solvent system, respectively. Further increasing the polymer-to-FeCl3 ratios leads to the enlargement of the spherical pore sizes in the DMF system, whereas the center-to-center distances of the wormlike structures in the 1,4-dioxane system decrease. Moreover, DMF/1,4-dioxane solvent mixtures with different volume ratios are applied for the sol\textendashgel solution preparation to gain more insight into how the solvent selectivity affects the thin film morphology. By adjusting the preferential affinity of the solvent mixture to the polymer blocks, a spherical to wormlike pore shape transition is observed with a critical Δχ value of around 0.77.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{,
title = {Tailored Local Bandgap Modulation as a Strategy to Maximize Luminescence Yields in Mixed-Halide Perovskites},
author = {S Feldmann and T Neumann and R Ciesielski and R H Friend and A Hartschuh and F Deschler},
url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/adom.202100635},
doi = {https://doi.org/10.1002/adom.202100635},
issn = {2195-1071},
year = {2021},
date = {2021-06-12},
journal = {Advanced Optical Materials},
volume = {n/a},
number = {n/a},
pages = {2100635},
abstract = {Abstract Halide perovskites have emerged as high-performance semiconductors for efficient optoelectronic devices, not least because of their bandgap tunability using mixtures of different halide ions. Here, temperature-dependent photoluminescence microscopy with computational modelling is combined to quantify the impact of local bandgap variations from disordered halide distributions on the global photoluminescence yield in mixed-halide perovskite films. It is found that fabrication temperature, surface energy, and charge recombination constants are keys for describing local bandgap variations and charge carrier funneling processes that control the photoluminescence quantum efficiency. It is reported that further luminescence efficiency gains are possible through tailored bandgap modulation, even for materials that have already demonstrated high luminescence yields. The work provides a novel strategy and fabrication guidelines for further improvement of halide perovskite performance in light-emitting and photovoltaic applications.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{,
title = {Self-Constructed Multiple Plasmonic Hotspots on an Individual Fractal to Amplify Broadband Hot Electron Generation},
author = {X Wang and C Liu and C Gao and K Yao and S S M Masouleh and R Bert\'{e} and H Ren and L D S Menezes and E Cort\'{e}s and I C Bicket and H Wang and N Li and Z Zhang and M Li and W Xie and Y Yu and Y Fang and S Zhang and H Xu and A Vomiero and Y Liu and G A Botton and S A Maier and H Liang},
url = {https://doi.org/10.1021/acsnano.1c03218},
doi = {10.1021/acsnano.1c03218},
issn = {1936-0851},
year = {2021},
date = {2021-06-11},
journal = {ACS Nano},
abstract = {Plasmonic nanoparticles are ideal candidates for hot-electron-assisted applications, but their narrow resonance region and limited hotspot number hindered the energy utilization of broadband solar energy. Inspired by tree branches, we designed and chemically synthesized silver fractals, which enable self-constructed hotspots and multiple plasmonic resonances, extending the broadband generation of hot electrons for better matching with the solar radiation spectrum. We directly revealed the plasmonic origin, the spatial distribution, and the decay dynamics of hot electrons on the single-particle level by using ab initio simulation, dark-field spectroscopy, pump\textendashprobe measurements, and electron energy loss spectroscopy. Our results show that fractals with acute tips and narrow gaps can support broadband resonances (400\textendash1100 nm) and a large number of randomly distributed hotspots, which can provide unpolarized enhanced near field and promote hot electron generation. As a proof-of-concept, hot-electron-triggered dimerization of p-nitropthiophenol and hydrogen production are investigated under various irradiations, and the promoted hot electron generation on fractals was confirmed with significantly improved efficiency.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}