Photovoltaic conversion and quantum efficiency in perovskite multiferroic ceramics. (1st May 2018)

• Record Type: Journal Article
• Authors: Tu, Chi-Shun; Chen, Pin-Yi; Chen, Cheng-Sao; Chien, R.R.; Hugo Schmidt, V.; Lin, Chun-Yen
• Is Part Of: Acta materialia. Volume 149(2018)
• Page Start: 248
• Page End: 255
• Publication Date: 2018-05-01
• Subjects: Neodymium-doped BiFeO3 ceramics -- Power-conversion efficiency -- Junction model -- External quantum efficiency; Materials -- Periodicals; Materials science -- Periodicals; Materials -- Mechanical properties -- Periodicals; Metallurgy -- Periodicals; Chemistry, Inorganic -- Periodicals; 620.112
• DOI: 10.1016/j.actamat.2018.02.043
• Languages: English
• ISSNs: 1359-6454

Abstract

Abstract: Junction-driven photovoltaic effects in lead-free perovskite BiFeO3 multiferroic materials have demonstrated promising applications in energy harvesting and optical sensors. This study highlights remarkable photon-to-electron external quantum efficiency (EQE) of ∼9% and light-to-electric power-conversion efficiency (PCE) of ∼0.8% in the heterostructure consisting of A-site neodymium-doped BiFeO3 ceramic and indium-tin-oxide (ITO) thin film under irradiation of wavelength λ = 405 nm. A theoretical p-n-junction model based on the photo-generated carriers was employed to quantitatively describe open-circuit voltage (Voc ) and short-circuit current density (Jsc ) as functions of irradiation intensity, and to calculate junction widths and carrier densities. The direct band gap and the degree of local disorder (or defect state) were estimated using the photon-energy-dependent optical attenuation coefficient with the Tauc and Urbach relations. Graphical abstract: Image 1