Author: Mar Tristany

Band Gap Tuning of Solution-Processed Ferroelectric Perovskite BiFe1–xCoxO3 Thin Films

Pamela MachadoMateusz ScigajJaume GazquezEstel RuedaAntonio Sánchez-DíazIgnasi FinaMartí Gibert-RocaTeresa PuigXavier ObradorsMariano Campoy-Quiles, and Mariona Coll*Chem. Mater.201931 (3), pp 947–954

 DOI: 10.1021/acs.chemmater.8b04380

Ferroelectric perovskite oxides are emerging as a promising photoactive layer for photovoltaic applications because of their very high stability and their alternative ferroelectricity-related mechanism for solar energy conversion that could lead to extraordinarily high efficiencies. One of the biggest challenges so far is to reduce their band gap toward the visible region while simultaneously retaining ferroelectricity. To address these two issues, herein an elemental composition engineering of BiFeO3 is performed by substituting Fe by Co cations, as a means to tune the characteristics of the transition metal–oxygen bond. We demonstrate by solution processing the formation of epitaxial, pure phase, and stable BiFe1–xCoxO3 thin films for x ≤ 0.3 and film thickness up to 100 nm. Importantly, the band gap can be tuned from 2.7 to 2.3 eV upon cobalt substitution while simultaneously enhancing ferroelectricity. As a proof of concept, nonoptimized vertical devices have been fabricated and, reassuringly, the electrical photoresponse in the visible region of the Co-substituted phase is improved with respect to the unsubstituted oxide.

Congratulations Dr. Alexander Stangl! New SUMAN graduate!

Dr. Alexander Stangl, former PhD researcher under the supervision of Prof. Teresa Puig and Dr. Anna Palau defended his PhD thesis entitled “Oxygen kinetics and charge doping for high critical current YBCO films” publicly on 20 March 2019 at the ICMAB-CSIC Auditorium. We have interviewed him to know a little bit more about her PhD and his life at the ICMAB! Do you know which is his favourite women scientist?

Continue reading

CosmoCaixa, 6-10 MAR 2019: Fira Recerca en Directe with the Superconducting Materials Group!

This year, the 17th edition of the “Fira Recerca en Directe”, organized by the Parc Científic de Barcelona (PCB) in collaboration with Obra Social “la Caixa”, will count with the participation of some researchers from SUMAN group , which will show, among others, the levitating superconducting train.

Continue reading

Institut de Ciència de Materials de Barcelona ICMAB CSIC

Address


Campus de la UAB, 08193 Bellaterra, Barcelona, Spain
+34 935 801 853 ext 371 
hr_suman@icmab.es