Photoresponse of KNbO3–AFeO3 (A = Bi3+ or La3+) ceramics and its relationship with bandgap narrowing

ELICKER, Carolina, PASCUAL-GONZALEZ, Cristina, GULARTE, Luciano, MOREIRA, Mario, CAVA, Sergio and FETEIRA, Antonio (2018). Photoresponse of KNbO3–AFeO3 (A = Bi3+ or La3+) ceramics and its relationship with bandgap narrowing. Materials Letters, 221, 326-329. (In Press)

[img] PDF
KNbO3–AFeO3-materialsletters_acceptedversion.pdf - Accepted Version
Restricted to Repository staff only until 19 March 2019.
Creative Commons Attribution Non-commercial No Derivatives.

Download (606kB)
[img] PDF
SUPPLEMENTARY INFORMATION_AF[1].pdf - Supplemental Material
Restricted to Repository staff only until 19 March 2019.
Creative Commons Attribution Non-commercial No Derivatives.

Download (183kB)
Official URL: https://www.sciencedirect.com/science/article/pii/...
Link to published version:: 10.1016/j.matlet.2018.03.089

Abstract

The crystal structure of (1-x)KNbO3–xBiFeO3 (KNBF) and (1-x)KNbO3-LaFeO3 (KNLF) (where x=0.00; 0.01; 0.02; 0.04; 0.08; 0.16; 0.32) was evaluated by XRD and Raman spectroscopy. XRD data show the crystal symmetry to evolve from orthorhombic to tetragonal with increasing x. The optical bandgap was found to narrow systematically with increasing x. Raman spectroscopy analysis corroborated long-range polar order in all compositions. The photoresponse of x=0.32 shows a typical diode–like behaviour, with current and voltage of 0.115 µA and 0.075 V for KNBF and 0.19 µA and 0.035 V for KNLF, respectively. To our knowledge these represent the largest values among KNbO3–based ceramics, making them promising for photovoltaic applications.

Item Type: Article
Departments: Arts, Computing, Engineering and Sciences > Engineering and Mathematics
Identification Number: 10.1016/j.matlet.2018.03.089
Depositing User: Antonio Feteira
Date Deposited: 19 Mar 2018 13:57
Last Modified: 25 Apr 2018 19:13
URI: http://shura.shu.ac.uk/id/eprint/18966

Actions (login required)

View Item View Item

Downloads

Downloads per month over past year

View more statistics