通过 Ba(Fe1/2Nb1/2)O3 取代调谐带隙并控制 BiFeO3 中的氧空位,增强 Al/BFO-BFN/Ag 太阳能电池中的体铁电性光电响应

IF 2.7 3区 物理与天体物理 Q2 PHYSICS, APPLIED Journal of Applied Physics Pub Date : 2024-08-29 DOI:10.1063/5.0219513
L. Venkidu, N. Raja, Vasundharadevi Venkidu, B. Sundarakannan
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引用次数: 0

摘要

产生高于带隙的光电压,即反常光伏效应(APV),是块状铁电光伏器件所追求的非凡特性。尽管 BiFeO3(BFO)的带隙相对较窄(2.7 eV),与其他铁电光伏器件相比能产生更大的光电流,但它在产生反常光电电压(Eg ≪ Voc)方面仍有不足,并且由于不可避免的氧空位而表现出漏铁电滞后。这项研究发现,通过在 BFO 中取代 Ba(Fe1/2Nb1/2)O3 可以减少氧空位,从而改善结构、形态、同步辐射 XPS 和电学特性。由于氧空位的减少,80BFO-20BFN 的带隙以上光电电压(APV)达到了惊人的 4.41 V,并且在极性相和非极性相共存时观察到了更大的铁电极化(Pr = 20.45 μC/cm2)。此外,理论和实验光学分析表明,带隙显著下降到 1.92 eV,有效地将可见光区域扩展到 653 nm 附近。因此,产生了更多的光激发电荷载流子,在 100 mW/cm2 的光照射下可达到 0.75 μA/cm2 的高电流密度(Jsc)。
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Tuning bandgap and controlling oxygen vacancy in BiFeO3 via Ba(Fe1/2Nb1/2)O3 substitution for enhanced bulk ferroelectric photovoltaic response in Al/BFO–BFN/Ag solar cell
The generation of above-bandgap photovoltage, referred to as the anomalous photovoltaic effect (APV), is an extraordinary characteristic sought after property in bulk ferroelectric photovoltaic devices. Despite the fact that the relatively narrow bandgap of BiFeO3 (BFO) (2.7 eV) induces a comparatively larger generation of photocurrent than other ferroelectric photovoltaic, it falls short in producing an anomalous photovoltage (Eg ≪ Voc) and exhibits leaky ferroelectric hysteresis due to unavoidable oxygen vacancies. This work revealed a reduction in oxygen vacancies through the substitution of Ba(Fe1/2Nb1/2)O3 in BFO, leading to improved structural, morphological, synchrotron XPS, and electrical properties. This reduction in oxygen vacancies has resulted in an impressive above-bandgap photovoltage (APV) of 4.41 V for 80BFO–20BFN with greater ferroelectric polarization (Pr = 20.45 μC/cm2) observed at the co-existence of polar and non-polar phases. Moreover, both theoretical and experimental optical analyses have demonstrated a significant decrease in the bandgap to 1.92 eV, effectively extending the visible region close to 653 nm. As a result, a larger population of photoexcited charge carriers is generated, enabling the attainment of a high current density (Jsc) of 0.75 μA/cm2 under 100 mW/cm2 light irradiation.
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来源期刊
Journal of Applied Physics
Journal of Applied Physics 物理-物理:应用
CiteScore
5.40
自引率
9.40%
发文量
1534
审稿时长
2.3 months
期刊介绍: The Journal of Applied Physics (JAP) is an influential international journal publishing significant new experimental and theoretical results of applied physics research. Topics covered in JAP are diverse and reflect the most current applied physics research, including: Dielectrics, ferroelectrics, and multiferroics- Electrical discharges, plasmas, and plasma-surface interactions- Emerging, interdisciplinary, and other fields of applied physics- Magnetism, spintronics, and superconductivity- Organic-Inorganic systems, including organic electronics- Photonics, plasmonics, photovoltaics, lasers, optical materials, and phenomena- Physics of devices and sensors- Physics of materials, including electrical, thermal, mechanical and other properties- Physics of matter under extreme conditions- Physics of nanoscale and low-dimensional systems, including atomic and quantum phenomena- Physics of semiconductors- Soft matter, fluids, and biophysics- Thin films, interfaces, and surfaces
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