Interplay of negative electronic compressibility and capacitance enhancement in lightly-doped metal oxide Bi_0.95La_0.05FeO₃ by quantum capacitance model.

ABSTRACT: Light-sensitive capacitance variation of Bi_0.95La_0.05FeO₃ (BLFO) ceramics has been studied under violet to UV irradiation. The reversible capacitance enhancement up to 21% under 405 nm violet laser irradiation has been observed, suggesting a possible degree of freedom to dynamically control this in high dielectric materials for light-sensitive capacitance applications. By using ultraviolet photoemission spectroscopy (UPS), we show here that exposure of BLFO surfaces to UV light induces a counterintuitive shift of the O_2p valence state to lower binding energy of up to 243 meV which is a direct signature of negative electronic compressibility (NEC). A decrease of BLFO electrical resistance agrees strongly with the UPS data suggesting the creation o

SUBMITTER: Nathabumroong S 

PROVIDER: S-EPMC7083945 | biostudies-literature | 2020 Mar

REPOSITORIES: biostudies-literature