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Articles by Simon Kahmann
Photoluminescence microscopy of optoelectronic materials - Nature Reviews Methods Primers
Abstract Photoluminescence (PL) microscopy is a technique for mapping the spatial distribution of optical and electronic properties in optoelectronic (OE) materials, including silicon, III–V and organic semiconductors, halide perovskites and quantum dots.
Dynamic nanodomains dictate macroscopic properties in lead halide perovskites - Nature Nanotechnology
Abstract Lead halide perovskites have emerged as promising materials for solar energy conversion and X-ray detection owing to their remarkable optoelectronic properties. However, the microscopic origins of their superior performance remain unclear. Here we show that low-symmetry dynamic nanodomains present in the high-symmetry average cubic phases, whose characteristics are dictated by the A-site cation, govern the macroscopic behaviour.
A Practical Approach Toward Highly Reproducible and High‐Quality Perovskite Films Based on an Aging Treatment
1 Introduction Metal halide-based hybrid perovskites have attracted widespread research and development interests due to their broad applicability and promising potential in photovoltaics,[1] light-emission diodes,[2] and photodetectors.[3] As a class of high-profile functional materials, perovskites exhibit not only remarkable electronic and optoelectronic properties[4] but also can be prepared with facile and low-cost solution-processing methods.[5] A wide range of deposition techniques,...
Taking a closer look - how the microstructure of Dion-Jacobson perovskites governs their photophysics
Taking a closer look – how the microstructure of Dion-Jacobson perovskites governs their photophysics Simon Kahmann, Herman Duim, Alexander J. Rommens, Kyle Frohna, Gert ten Brink, Giuseppe Portale, Samuel D Stranks and Maria Antonietta Loi Abstract Scarce information is available on the thin film morphology of Dion-Jacobson halide perovskites. However, the microstructure can have a profound impact on a material’s photophysics and its potential for optoelectronic applications.
Photophysics of Two‐Dimensional Perovskites-Learning from Metal Halide Substitution
Abstract 2D perovskites offers a rich playing field to explore exciton physics and they possess a great potential for a variety of opto-electronic applications. Whilst their photophysics shows intricate interactions of excitons with the lattice, most reports have so far relied on single compound studies.
Fundamentals of tin iodide perovskites: a promising route to highly efficient, lead-free solar cells
Fundamentals of tin iodide perovskites: a promising route to highly efficient, lead-free solar cells Hybrid tin-iodide perovskites are investigated as potential lead-free replacement of the lead-iodide perovskites; however, the intrinsic operational limit of these systems has not been described in detail, so far.
Influence of the Stoichiometry of tin-based 2D/3D Perovskite active layer on Solar Cells performances
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Photochromism in Ruddlesden-Popper Copper-Based Perovskites: A Light-Induced Change of Coordination Number at the Surface
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Hot carrier solar cells and the potential of perovskites for breaking the Shockley-Queisser limit
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Donor-acceptor photoexcitation dynamics in organic blends investigated with a high sensitivity pump-probe system
Optical pump–probe spectroscopy is a crucial tool to investigate the excited state behaviour of materials and is especially useful to investigate the photoexcitation dynamics of bulk heterojunctions as found in organic solar cells. Most common techniques for such investigations involve pulses with an energy density in the range of several tens of μJ cm , emitted with kHz repetition rate.
Delocalisation softens polaron electronic transitions and vibrational modes in conjugated polymers
In this work we study the photoinduced signatures of polarons in conjugated polymers and the impact of charge carrier delocalisation on their spectra. The variation of film crystallinity for two prototypical systems \textendash\ blends of the homopolymer P3HT or the donor-acceptor polymer PCPDTBT with PCBM \textendash\ allows to probe changes of the polaron absorption in the mid infrared spectral region.
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