A team of researchers from Penn State, Cornell and Argonne National Laboratory have manages to visualize, for the first time, the 3D atomic and electron density structure of the most complex perovskite crystal structure system known to date.

A reconstruction of a perovskite crystal (CaTiO3) grown on a similar perovskite substrate (NdGaO3) showing electron density and oxygen octahedral tilt. Credit: Penn State

The team explains that perovskite crystals have a distinct structure of oxygen atoms that form an octahedron — an eight-sided polygon. This arrangement of oxygen atoms acts like a cage that can hold a large number of the elemental atoms in the periodic table. Additionally, other atoms can be fixed to the corners of a cube outside of the cage at precise locations to alter the material’s properties, for instance in changing a metal into an insulator, or a non-magnet into a ferromagnet.

NUS scientists have found that the light emission properties of molecularly thin two-dimensional (2-D) hybrid perovskite can be tuned in a highly reversible way for ultrathin optoelectronic applications. A highly efficient photodetector has been fabricated using hybrid perovskites with the thickness of a single quantum well.

An impression of laser interaction with a molecularly thin 2D perovskites encapsulated by hexagonal boron nitride (blue layer). (Image: NUS)

Each basic unit of a 2D hybrid perovskite is constructed using a semiconducting layer of inorganic material sandwiched between two organic insulating layers. While researchers have studied layered perovskites in their bulk form for many years, the properties of these crystals when their thickness is thinned down to a few and single layers have largely not been explored.

The Directors of Greatcell Solar have sadly announced that a decision was taken to appoint administrators to the Greatcell Solar group of companies following sustained, but ultimately unsuccessful, attempts to secure re-financing for its activities.

Greatcell Solar Limited, Greatcell Solar Industries and Greatcell Solar Australia were placed into voluntary administration. The decision follows a series of unfortunate and unwelcome developments in recent weeks, including the untimely death of Chief Scientist, Dr Hans Desilvestro in a mountaineering accident on 10 November.