New seminconductor materials are required in many areas within renewable energy and energy saving as well as in electronics. One group of materials has so far avoided attention as potential semiconductors: high entropy alloys (HEA). They typically consist of at least five different metallic elements in approximately equimolar amounts and adopt simple crystal structures. HEA can exhibit unusual and promising properties for many applications, but up to now the main emphasis has been to use them as structural materials due to their strength, corrosion resistance and/or stability. The main idea of the present project is to initiate a systematic search for properties that are relevant for semiconductor-based technologies within the space of hypothetical HEA compositions. This space is enormous: not only is the number of combinatorial possibilities huge, but the freedom to vary the amount of each element around the equimolar quantity (e.g. 20% for five elements) explodes the number of potential compositions. This calls for a systematic, high-throughput approach where the properties of a large number of compositions can be investigated simultaneously. The HEATER project will do this both experimentally and theoretically. Multi-source magnetron sputtering will generate graded films with thousands of compositions represented in a single disk. A range of high-throughput characterization techniques will be used to map out several properties for composition ranges. Simultaneously, electronic scale modelling will be used to complement the experimental work using a host of state-of-the-art techniques. The optimization will be taken further with a machine learning concept, where intelligent data analysis is used to parameterize models that can predict compositions completely different from the usual suspects. If successful, this project will give a tremendous contribution to materials technology as well as to fundamental materials science.
Project leader: Patricia Almeida Carvalho
Category: Teknisk-industrielle institutter
Institution: INSTITUTT FOR MATERIALER OG KJEMI I OSLO