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Solar Material Can 'self-heal' Imperfections

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Sb2Se3 repairs broken bonds created when it is cleaved by forming new ones

A material that can be used in technologies such as solar power has been found to self-heal, a new study shows. The findings - from the University of York in the UK - raise the prospect of engineering high-performance self-healing materials which could reduce costs and improve scalability.

The substance is the compound semiconductor antimony selenide (Sb2Se3), a solar absorber material that can be used for turning light energy into electricity.

Keith McKenna from the Department of Physics said: "The process by which this semiconducting material self-heals is rather like how a salamander is able to re-grow limbs when one is severed. Antimony selenide repairs broken bonds created when it is cleaved by forming new ones.

"This ability is as unusual in the materials world as it is in the animal kingdom and has important implications for applications of these materials in optoelectronics and photochemistry."

The paper discusses how broken bonds in many other semiconducting materials usually results in poor performance. Researchers cite as an example, another semiconductor called CdTe that has to be chemically treated to fix the problem.

McKenna added: "We discovered that antimony selenide and the closely related material, antimony sulphide, are able to readily heal broken bonds at surfaces through structural reconstructions, thereby eliminating the problematic electronic states.

"Covalently-bonded semiconductors like antimony selenide find widespread applications in electronics, photochemistry, photovoltaics and optoelectronics for example solar panels and component for lighting and displays.

'Self-healing of broken bonds and deep gap states in Sb2Se3 and Sb2S3' by Keith McKenn ; Advanced Electronic Materials, January 27th 2021.

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