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Self-Healing Ability of Perovskites Observed via Photoluminescence Response on Nanoscale Local Forces and Mechanical Damage.
Adv Sci (Weinh)
December 2022
Chemical Physics and NanoLund, Lund University, Box 124, Lund, 22100, Sweden.
The photoluminescence (PL) of metal halide perovskites can recover after light or current-induced degradation. This self-healing ability is tested by acting mechanically on MAPbI polycrystalline microcrystals by an atomic force microscope tip (applying force, scratching, and cutting) while monitoring the PL. Although strain and crystal damage induce strong PL quenching, the initial balance between radiative and nonradiative processes in the microcrystals is restored within a few minutes.
View Article and Find Full Text PDFImpact of metastable defect structures on carrier recombination in solar cells.
Faraday Discuss
October 2022
Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Str. 1, 40237 Düsseldorf, Germany.
The efficiency of a solar cell is often limited by electron-hole recombination mediated by defect states within the band gap of the photovoltaic (PV) semiconductor. The Shockley-Read-Hall (SRH) model considers a static trap that can successively capture electrons and holes. In reality however, true trap levels vary with both the defect charge state and local structure.
View Article and Find Full Text PDFBottom-Up Assembly of Molecular Nanostructures by Means of Ferroelectric Lithography.
Langmuir
January 2017
Institut für Angewandte Physik and Center for Advancing Electronics Dresden (cfaed), Technische Universität Dresden, D-01062 Dresden, Germany.
Here, we report on the photochemical deposition of Rhodamine 6G (Rh6G) and Alexa647 molecules from aqueous and methanolic solution along 180° ferroelectric (FE) domain walls (DWs) of z-cut lithium niobate (LNO) single crystals. Molecules and FE domains were investigated by means of dynamic-mode AFM, piezoresponse force microscopy (PFM), and confocal scanning fluorescence microscopy. A high deposition affinity for 180° DWs on the LNO surface is observed, leading to the formation of molecular nanowires.
View Article and Find Full Text PDFComplex behaviour of vacancy point-defects in SrRuO3 thin films.
Phys Chem Chem Phys
January 2015
Institute of Physical Chemistry, RWTH Aachen University and JARA-FIT, 52056 Aachen, Germany.
The behaviour of point defects in thin, epitaxial films of the oxide electrode SrRuO3 was probed by means of diffusion measurements. Thin-film SrRuO3 was deposited by means of pulsed laser deposition (PLD) on (100) oriented, undoped single crystal SrTiO3 substrates. (16)O/(18)O exchange anneals were employed to probe the behavior of oxygen vacancies.
View Article and Find Full Text PDFMonte Carlo studies of the XY model on two-dimensional curved surfaces.
J Phys Chem B
December 2011
Liquid Crystal Institute, Kent State University, Kent, Ohio 44242, USA.
To explore the interaction between topological defects and curvature in materials with orientational order, we perform Monte Carlo studies of the two-dimensional XY model on the surface of curved substrates. Each curved surface is patterned with a random lattice constructed via random sequential absorption, and an XY spin is positioned at each lattice site. Spins lie in the plane locally tangent to the surface and interact with neighbors defined via a distance cutoff.
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