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Ferroelectric photovoltaic and flexo‐photovoltaic effects in (1 − x)(Bi0.5Na0.5)TiO3‐xBiFeO3 systems under visible light
Journal of the American Ceramic Society ( IF 3.9 ) Pub Date : 2020-03-09 , DOI: 10.1111/jace.17099
Yunyun Gong 1, 2 , Chen Chen 2, 3 , Faqiang Zhang 4 , Xiang He 1, 2 , Huarong Zeng 4 , Qunbao Yang 4 , Yongxiang Li 4 , Zhiguo Yi 1, 2, 3
Affiliation  

The anomalous photovoltaic (APV) effect has witnessed great progress from classical ferroelectric photovoltaics to flexo‐photovoltaics. Both call for an extension of the spectral response range. Here, we present a comprehensive study on the ferroelectric, photoelectric, and photovoltaic properties of pure (Bi0.5Na0.5)TiO3 (BNT) and 0.3(Bi0.5Na0.5)TiO3–0.7BiFeO3 (0.3BNT‐0.7BFO) ceramics. The data show that pure BNT with typical ferroelectricity exhibits intriguing photovoltaic effect even when illuminated by 550 nm visible light, while the 0.3BNT‐0.7BFO solid solution with enhanced visible light absorption shows no ferroelectric photovoltaic due to the negligible ferroelectricity but striking strain‐induced flexo‐photovoltaic effect. Transmission electron microscopy analysis reveals distinctions in the domain structures and local strain states in pure BNT and 0.3BNT‐0.7BFO ceramics, which may account for their differences in photovoltaic behavior. These findings not only deepen the understanding of photovoltaic mechanisms induced by ferroelectric polarization and flexoelectric effect but also highlight a possible candidate for multifunctional photoelectric applications.

中文翻译:

(1-x)(Bi0.5Na0.5)TiO3-xBiFeO3体系中可见光下的铁电光伏和柔性光伏效应

异常光伏效应(APV)见证了从经典铁电光伏到柔性光伏的巨大进步。两者都要求扩大光谱响应范围。在这里,我们对纯(Bi 0.5 Na 0.5)TiO 3(BNT)和0.3(Bi 0.5 Na 0.5)TiO 3 –0.7BiFeO 3的铁电,光电和光伏性能进行全面研究(0.3BNT-0.7BFO)陶瓷。数据表明,即使在550 nm可见光照射下,具有典型铁电性的纯BNT也会表现出耐人寻味的光伏效应,而具有增强可见光吸收性的0.3BNT-0.7BFO固溶体由于铁电性可以忽略不计,因此没有铁电光伏性,但会产生明显的应变感应柔性光伏效应。透射电子显微镜分析揭示了纯BNT和0.3BNT-0.7BFO陶瓷在畴结构和局部应变状态方面的差异,这可能解释了它们在光伏行为上的差异。这些发现不仅加深了对铁电极化和柔电效应引起的光伏机理的理解,而且突出了多功能光电应用的可能候选者。
更新日期:2020-03-09
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