More materials for electronic applications could be identified, thanks to the discovery of a new metal-organic framework (MOF) that displays electrical semiconducting with a record high photoresponsivity, by a global research collaboration that includes the University of Warwick.
Research by the University of Warwick, Universidade de São Paulo (Brazil), the Advanced Technology Institute at the University of Surrey, and the University of Grenoble-Alpes (France) shows how high photoconductivity and semiconductor behaviour can be added to MOFs, which already have a huge scientific focus for their applications in gas storage, sensing and catalysis. The work found that the new MOF has a photoresponsivity of 2.5 × 105 A.W-1- the highest ever observed.
The MOF has been prepared using cobalt ions and naphthalene diimides and acid as ligands. The structure shows anisotropic redox conduction, according to the directions of the crystal lattice. The conduction mechanism is sensitive to light, and may be modified or modulated according to the incident wavelength.
Photoactive and semiconducting MOFs are rare but desirable for electrical and photoelectrical devices.
These results are the first of this kind concerning MOFs and are the starting point for the possibility of discovery of even more functional materials, displaying properties suitable for practical applications.
The potential for use in electronic components and photoconversion devices, such as solar cells and photocatalysts provides a very exciting future for such materials.
Professor Richard Walton (pictured), from Warwick’s Department of Chemistry, said: “The material we have discovered paves the way for new applications of a topical family of materials in many areas ranging from technology to energy conversion. We illustrate how MOFs that combine organic and inorganic components can produce unique functional materials from readily available chemicals. “Our work was underpinned by Warwick’s strengthening collaborative links with Brazilian universities and our exceptional equipment for materials analysis ”