Grups de recerca
30
nov
Seminari FMC: Roc Matheu
El proper 30 de novembre tindrem el plaer d'escoltar en Roc Mathieu amb la xerrada que porta per títol "Charge Reservoirs in an Expanded Halide Perovskite Analog: Enhancing High-Pressure Conductivity through Redox-Active Molecules". Us esperem!
Dates:
30-11-2023
Horari:
12:45
Lloc:
Seminar room 320, 3rd floor of the Faculty of Physics, UB
Afegeix-ho a l'agenda (iCal)
Charge Reservoirs in an Expanded Halide Perovskite Analog: Enhancing High-Pressure Conductivity through Redox-Active Molecules
Roc Matheu (roc.matheu@ub.edu)
Departament de Química Inorgànica i Orgànica, Universitat de Barcelona.
As halide perovskites and their derivatives are being developed for numerous optoelectronic applications, controlling their electronic doping remains a fundamental challenge. We have recently discovered a novel strategy of using redox-active organic molecules as stoichiometric electron acceptors in new expanded perovskite analogs. Compressing the metal-halide framework drives up the valence band relative to the acceptor orbitals of the organic molecules. Thus, the material’s electronic conductivity increases by a factor of 105 with pressure, reaching 50(17) S cm–1 at 60 GPa, exceeding the high-pressure conductivities of most halide perovskites. This conductivity enhancement is attributed to an increased hole density created by reduction of the redox-active molecules. This work elevates the role of organic cations in 3D metal-halides, from templating the structure to serving as charge reservoirs for tuning the carrier concentration.
