Conveners
Energy materials: batteries, photovoltaics, etc.
- Hilke Petersen (Max-Planck-Institut für Kohlenforschung)
Energy materials: batteries, photovoltaics, etc.
- Hilke Petersen (Max-Planck-Institut für Kohlenforschung)
The oxygen mobility and exchange are fundamental properties of perovskite oxides which regulate their application in catalysis, sensing, energy conversion and information technology [1]. The increasing need of sustainable catalytic materials has driven the development of nanoporous perovskite structures with improved surface reactivity [2,3]. Although it is intuitive that enhanced specific...
ZnSnN$_{2}$ is an earth-abundant semiconductor with a predicted direct bandgap between 1.12-2.09 eV, based on DFT calculations.$^{1}$ Thus, it has been considered as a potential absorber material for solar cells. Recently, a numerical device simulation based on reported experimental material properties found a theoretical maximum efficiency of η ≈ 22% of for a ZnSnN$_{2}$ based solar...
Our quest to find new materials to be utilised in technological applications leads us more and more towards solid solutions between different materials. These solid solutions allow for the fine-tuning of desired material properties, but also pose additional problems in experimental characterisation and theoretical modelling. While we’re able to deal with fractional occupancies of Wyckoff...
Hybrid halide perovskites are a new class of solution-processed semiconductors that combine low-temperature (<100 °C) synthesis, high charge carrier diffusion length and low defect density. The past few years, hybrid halide perovskites such as $CH_{3}NH_{3}PbI_{3}$ have shown promising results for the detection of high-energy ionizing radiation (X- and Gamma-rays).[1] Their large-scale...
Research interest has increasingly focused on hybrid perovskites MABX3 like [CH3NH3]+ (MA), B = Pb and X = I or Cl as a future photovoltaic material. There is a strong demand to better understand the possible impact of various entropy contributions (stochastic structural fluctuations, anharmonicity and lattice softness) on the optoelectronic properties of halide perovskite materials and...
We report the fabrication of SrTiO3 thin films doped by Ni and its influence on the electronic structure. The SrTiO3 thin films were deposited by magnetron sputtering which is suitable for mass-production of samples adapted for nanoelectronic applications. The structure of the STO:Ni was investigated by XRD phase analysis. We evaluated the influence of Ni on crystallinity, the size of coherent...
Kesterite-type based thin film solar cell technologies are mainly based on polycrystalline absorber layers. A promising low cost alternative technology uses Cu2ZnSn(S,Se)4 (CZTSSe) monograins (single crystals of 50-100 μm size) which are fixed in a polymer matrix to form a flexible solar cell [1].
It is agreed in literature that large band tailing observed in Cu-based kesterite-type...
Operation of typical lithium-ion battery is supplemented by the continuous mass transfer, which affects the ionic transport through the electrodes and electrolyte. Ionic transfer is defined by different factors like electrode dimensions and geometry, current density, temperature, pressure, reaction rate etc. All these properties are not necessarily uniformly distributed and, therefore, can...
Perovskite solid solutions are versatile materials, which are widely used especially in heterogeneous catalysis [1]. Their performance is determined by the materials‘defect chemistry, charge charrier transport properties and surface area. Hence, nanoporous perovskites, due to their large surface and thus higher reactive area, are well suited for the use in Solid Oxide Fuel Cells (SOFC),...
The peculiar hydrogen arrangement in the hureaulite-type manganese endmember ($Mn_5[(PO_4)_2(PO_3OH)_2](HOH)_4$) comprises semihelical hydrogen bond chains along porous channels as well as framework HOH ligands in small cages. Results from extensive, complementary studies are presented to show (1) the time and length scales of local and long-range proton dynamics in the title compound and (2)...
