High-Mobility Band-Like Charge Transport in a Semiconducting Two-Dimensional Fe2THT3 MOF
Renhao Dong b, Peng Han a, Himani Arora c, Marco Ballabio a e, Melike Karakus a, Zhe Zhang b, Chandra Shekhar d, Peter Adler d, Petko St. Petkov f g, Artur Erbe c, Stefan C. B. Mannsfeld b, Claudia Felser d, Thomas Heine b c f, Mischa Bonn a, Xinliang Feng b, Enrique Cánovas a e
a Max Planck Institute for Polymer Research, Ackermannweg, 10A, Mainz, Germany
b Physical Chemistry and Center for Advancing Electronics Dresden (cfAED), TU Dresden, Bergstraße 66b, Dresden, 01069, Germany
c Helmholtz-Zentrum Dresden-Rossendorf, PO Box 510119, Dresden, 01314, Germany
d Max Planck Institute for Chemical Physics of Solids, Dresden, Nöthnitzer Straße, 40H, Dresden, Germany
e IMDEA-Nanociencia, Campus de Cantoblanco, 28049 Madrid, Spain
f Wilhelm-Ostwald-Institute of Physical and Theoretical Chemistry, Universitätsstraße Leipzig, Leipzig, Germany
g Faculty of Chemistry and Pharmacy, University of Sofia, Sofia, Bulgaria
Proceedings of Organic 2D Crystalline Materials: Chemistry, Physics and Devices (O2DMAT)
Madrid, Spain, 2022 September 15th - 16th
Organizers: Enrique Cánovas, Renhao Dong and Hai Wang
Poster, Marco Ballabio, 019
Publication date: 11th July 2022

Metal-organic frameworks (MOFs) are hybrid materials that consist of metal ions coordinated by organic ligands. Traditionally, as a consequence of their porosity, this class of materials finds applications in gas storage and separation or catalysis, while their typical insulating character has prevented them from their exploitation in the field of electronics. However, the advancements in achieving long-range crystalline order in MOFs, as well as the tunable coupling between the organic and inorganic constituents, has led to the recent development of electrically conductive MOFs as a new generation of electronic materials.

For long, the nature of charge transport in conductive MOFs, i.e. whether a hopping or band-like transport mechanism is operative, has remained unresolved. Here we demonstrate, using time-resolved terahertz spectroscopy and Hall effect measurements, Drude-type, band-like transport in a semiconducting, π-d conjugated porous Fe3(THT)2(NH4)3 (THT, 2,3,6,7,10,11-triphenylenehexathiol) two-dimensional MOF made of van der Waals stacked layers. The combined optical and electric techniques show unequivocally the presence of delocalized charge carriers with a room-temperature mobility up to 220 cm2V–1s–1. Moreover, the temperature-dependent conductivity reveals that this mobility represents a lower bound for the material, limited only by scattering with impurities. These results illustrate the potential for high-mobility semiconducting MOFs as active materials in thin-film optoelectronic devices.

We use our own and third party cookies for analysing and measuring usage of our website to improve our services. If you continue browsing, we consider accepting its use. You can check our Cookies Policy in which you will also find how to configure your web browser for the use of cookies. More info