Bandgap engineering and enhancing photovoltaic effect in NBT–BNT–xNd lead-free ceramics
Source abstract
Abstract
The influence of Nd dopant on the photoelectric properties of 0.94Na0.5Bi0.5TiO3–0.06BaNi0.5Ti0.5O3–xNd ceramics were systematically investigated in this work. As the Nd3+ increases, the grain size gradually decreases and the crystal structure transforms from orthorhombic to tetragonal phase. Meanwhile, the dielectric constant and Curie temperature of ceramics gradually decrease, accompanied by the enhanced dielectric relaxation. The decreasing grain size and relatively strong ferroelectric properties facilitate the separation of photogenerated charge carriers. Optical absorption spectra indicate the enhanced absorption over a wider spectral range with a decrease optical band gap from 3.18 to 2.81 eV caused by Nd3+ doping. The photocurrent density improves from 44 nA/cm2 for the undoped sample to 105 nA/cm2 for x = 0.05 sample under AM1.5 standard sunlight after 40 kV/cm high-electric-field polarizing. This result demonstrates that the Nd doped NBT–BNT ferroelectric ceramics have high potential for the application in next-generation solar cells.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Ferroelectric and Piezoelectric Materials · Microwave Dielectric Ceramics Synthesis · Dielectric materials and actuators
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (53)
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