4.5 Article

Microstructures and Photovoltaic Properties of TiO2/BiFeO3 Core-Shell Nanowire Arrays

Journal

JOURNAL OF ELECTRONIC MATERIALS
Volume 52, Issue 5, Pages 3363-3373

Publisher

SPRINGER
DOI: 10.1007/s11664-023-10314-z

Keywords

BiFeO3; nanowire array; ferroelectric photovoltaic effect; core-shell structure

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In this study, a TiO2/BFO core-shell nanowire array structure was constructed to address the low photoelectric conversion efficiency problem of BiFeO3 (BFO)-based photovoltaic (PV) devices. The TiO2/BFO core-shell nanowire arrays, prepared by hydrothermal and sol-gel methods, exhibited significantly enhanced light absorption performance and improved conversion efficiency of 0.1177% compared to previously reported BFO-based ferroelectric photovoltaic (FEPV) films. The intrinsic mechanism of PV enhancement was elucidated by analyzing optical absorption, carrier lifetime, and energy band structure, demonstrating the potential applications of transport material/ferroelectric material core-shell nanowire array structures in PV devices.
To address the current problem of low photoelectric conversion efficiency of BiFeO3 (BFO)-based photovoltaic (PV) devices, a TiO2/BFO core-shell nanowire array structure was constructed in this study based on the characteristics of excellent light reflection, stronger light-trapping effect, large specific surface area, fast transport rate of photogenerated carriers, and good energy band matching relationship. The TiO2/BFO core-shell nanowire arrays were prepared by the hydrothermal and sol-gel methods. The experimental results show that the light absorption performance of the TiO2/BFO core-shell nanowire arrays is significantly enhanced compared with the previously reported BFO-based ferroelectric photovoltaic (FEPV) films, and the conversion efficiency has significantly improved to 0.1177%. The intrinsic mechanism of PV enhancement of the designed TiO2/BFO core-shell nanowire array structure was illustrated by combining optical absorption, carrier lifetime, and energy band structure. This study further demonstrates the potential applications of transport material/ferroelectric material core-shell nanowire array structures in PV devices.

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