Kannatassen Appavoo

TL;DR: It is reported that, counterintuitive to classical quantum-confined systems where photogenerated electrons and holes are strongly bound by Coulomb interactions or excitons, the photophysics of thin films made of Ruddlesden-Popper perovskites with a thickness exceeding two perovkite-crystal units is dominated by lower-energy states associated with the local intrinsic electronic structure of the edges of the perovSKite layers.

TL;DR: It is shown that the slow photocurrent degradation in thin-film photovoltaic devices is due to the formation of light-activated meta-stable deep-level trap states, and the creation of small polaronic states involving localized cooperative lattice strain and molecular orientations emerges as a credible microscopic mechanism requiring further detailed studies.

TL;DR: X-ray crystallography unravels molecular self-assembly and structural ordering on the curved surface of the largest gold nanoparticle, consisting of 133 atoms, and provides a conceptual advance in scientific understanding of pattern structures.

TL;DR: An in-depth computational study of small polaron formation, electronic structure, charge density, and reorganization energies using both periodic boundary conditions and isolated structures suggests formamidinium and cesium based crystals and alloys are potentially better materials for solar cell and other optoelectronic applications.

TL;DR: By measuring the degree of metallization in the lithographically defined VO(2) nanoparticles, it is found that hysteresis width narrows with increasing size, thus illustrating the potential for domain boundary engineering in phase-changing nanostructures.