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Abstract
Light-sensitive capacitance variation of Bi0.95La0.05FeO3 (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 O2p 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 of a thin conductive layer on its insulating bulk under light irradiation. By exploiting the quantum capacitance model, we find that the negative quantum capacitance due to this NEC effect plays an important role in this capacitance enhancement
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1 Suranaree University of Technology, School of Physics and Center of Excellence on Advanced Functional Materials, Nakhon Ratchasima, Thailand (GRID:grid.6357.7) (ISNI:0000 0001 0739 3220)
2 Suranaree University of Technology, School of Physics and Center of Excellence on Advanced Functional Materials, Nakhon Ratchasima, Thailand (GRID:grid.6357.7) (ISNI:0000 0001 0739 3220); King Mongkut’s University of Technology North Bangkok, Rayong Campus, Faculty of science, Energy and Environment, Rayong, Thailand (GRID:grid.443738.f) (ISNI:0000 0004 0617 4490)
3 Suranaree University of Technology, School of Physics and Center of Excellence on Advanced Functional Materials, Nakhon Ratchasima, Thailand (GRID:grid.6357.7) (ISNI:0000 0001 0739 3220); Thailand Center of Excellence in Physics (ThEP), MHSRI, Bangkok, Thailand (GRID:grid.450348.e)
4 Lawrence Berkeley National Laboratory, Advanced Light Source, Berkeley, USA (GRID:grid.184769.5) (ISNI:0000 0001 2231 4551)
5 Synchrotron Light Research Institute, Nakhon Ratchasima, Thailand (GRID:grid.472685.a)
6 Suranaree University of Technology, School of Physics and Center of Excellence on Advanced Functional Materials, Nakhon Ratchasima, Thailand (GRID:grid.6357.7) (ISNI:0000 0001 0739 3220); Vidyasirimedhi Institute of Science and Technology, School of Energy Science and Engineering, Rayong, Thailand (GRID:grid.494627.a)