Polarization-modulated photovoltaic conversion in polycrystalline bismuth ferrite
Source abstract
Abstract
Abstract Above-bandgap photovoltages in lead-free perovskite BiFeO 3 have been substantially studied for energy harvesting and photocatalytic applications. However, most reported photocurrents and conversion efficiencies are still too small due to wide bandgaps. Remarkably large and durable field-modulated external quantum efficiency (EQE) ∼11% and power conversion efficiency (PCE) ∼1% have been achieved under 405 nm irradiation in polycrystalline Nd-doped BiFeO 3 (BNFO) ceramic with a bandgap E g ∼2.12-2.24 eV. The photovoltaic voltage and current density can reach ∼0.9 V and ∼8.0 A/m 2 after poling ( E =1 kV/cm) at irradiation intensity 10 3 W/m 2 . The p-n-junction layer between indium tin oxide (ITO) thin film and BNFO ceramic is the primary mechanism for the field-modulated photovoltaic responses in conjunction with the polarization-induced Schottky-barrier modulation. The field-induced domain nucleation within the grains and nanodomains play important roles for the enhanced photocurrent and conversion efficiencies.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Multiferroics and related materials · Dielectric properties of ceramics · Perovskite Materials and Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (82)
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