Photoactive pixels switch on and off

Thanks to photocurrent spectral atomic force microscopy (PCS-AFM), researchers at the Massachusetts Institute of Technology (MIT) say they have been able to observe photoactive pixels switching on and off in a heterostructure made of two different 2D materials. The technique might help in the design of new electronic and optoelectronic devices based on these atomically […]

Photonic gyroids mimic butterfly wings

Using a technique called optical two-beam super-resolution lithography, researchers in Australia have succeeded in making photonic “gyroid” nanostructures similar to those found in butterfly wings. The artificial structures, which outperform their natural counterpart in many ways, might be used in a variety of photonics and optics technologies…. Comparing an artificial and natural gyroid structure

Collecting hot carriers in graphene superlattices

t least five “hot carriers” are produced for every photon absorbed by superlattices made from graphene and boron nitride. This new result from researchers in New York, Tallahassee and Seattle, means that the carbon sheet could be used to make flexible optoelectronics devices such as ultrafast and highly efficient photodetectors and solar cells…. Moiré […]

Analysing ‘3D graphene’

Researchers in Australia and Singapore are the first to have measured the electronic properties of topological Dirac semimetal thin films, which are 3D analogues of graphene. These films, made from sodium bismuth, have high charge carrier mobilities and could be used to make new electronic devices like topological transistors…….. Na3Bi thin films

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