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Dynamic Control of Piezoelectricity Enhancement via Modulation of the Bulk Photovoltaic Effect in a BiFeO3 Thin Film
Advanced Electronic Materials ( IF 5.3 ) Pub Date : 2022-09-06 , DOI: 10.1002/aelm.202200785 Yooun Heo 1 , Hangbo Zhang 1 , Marin Alexe 1
Advanced Electronic Materials ( IF 5.3 ) Pub Date : 2022-09-06 , DOI: 10.1002/aelm.202200785 Yooun Heo 1 , Hangbo Zhang 1 , Marin Alexe 1
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Piezoelectricity, which is an electromechanical effect induced by conversion between mechanical and electrical energy, is one of the key functionalities in ferroelectric oxides. Traditionally, structural engineering in synthesis via a variety of processing control parameters has been a well-established route to host so-called morphotropic phase boundaries for enhancing piezoelectricity. However, this involves dealing with synthetical complexity and difficulties of strictly controlling structures and defects. Instead, for simple and in situ control, here, a critical pathway for light-induced piezoelectricity enhancement and its dynamic control is unveiled in a BiFeO3/DyScO3 thin film by implementing an in-plane geometry operation, allowing for modulation of the bulk photovoltaic effect. A series of in-plane length-dependent piezoresponse force microscopy and conductive atomic force microscopy-based measurements under illumination reveals its strong influence on the photocurrent and photovoltage, consequently revealing a maximum of eightfold increase of the effective piezoelectric coefficient, dzz. Light polarization dependent measurements show sinusoidal behavior of piezoelectricity closely linked to photocurrent variations, leading to a further threefold increase of dzz. Temporal decay measurements reveal persistent behavior of enhanced piezoelectricity after removal of illumination, associated with reemission of photocarriers trapped in sub-levels. These results pave the way for light-induced piezoelectricity enhancement compatible with the photovoltaic effect in ferroelectric thin films for multifunctional nano-optoelectronics.
中文翻译：
通过调制 BiFeO3 薄膜中的体光伏效应动态控制压电增强
压电是由机械能和电能之间的转换引起的机电效应，是铁电氧化物的关键功能之一。传统上，通过各种工艺控制参数进行合成中的结构工程一直是一种成熟的途径，可以承载所谓的变形相界以增强压电性。然而，这涉及处理综合复杂性和严格控制结构和缺陷的困难。相反，对于简单的原位控制，这里在 BiFeO 3 /DyScO 3中揭示了光致压电增强及其动态控制的关键途径通过实施平面内几何操作，薄膜薄膜，允许调制体光伏效应。一系列平面内长度相关的压电响应力显微镜和基于导电原子力显微镜的光照测量揭示了其对光电流和光电压的强烈影响，因此有效压电系数d zz最多增加了八倍。光偏振相关测量显示压电的正弦行为与光电流变化密切相关，导致d zz进一步增加三倍. 时间衰减测量揭示了在去除照明后增强的压电性的持续行为，这与被困在亚能级中的光载流子的重新发射有关。这些结果为用于多功能纳米光电子学的铁电薄膜中与光伏效应兼容的光致压电增强铺平了道路。
更新日期：2022-09-06
中文翻译：
通过调制 BiFeO3 薄膜中的体光伏效应动态控制压电增强
压电是由机械能和电能之间的转换引起的机电效应，是铁电氧化物的关键功能之一。传统上，通过各种工艺控制参数进行合成中的结构工程一直是一种成熟的途径，可以承载所谓的变形相界以增强压电性。然而，这涉及处理综合复杂性和严格控制结构和缺陷的困难。相反，对于简单的原位控制，这里在 BiFeO 3 /DyScO 3中揭示了光致压电增强及其动态控制的关键途径通过实施平面内几何操作，薄膜薄膜，允许调制体光伏效应。一系列平面内长度相关的压电响应力显微镜和基于导电原子力显微镜的光照测量揭示了其对光电流和光电压的强烈影响，因此有效压电系数d zz最多增加了八倍。光偏振相关测量显示压电的正弦行为与光电流变化密切相关，导致d zz进一步增加三倍. 时间衰减测量揭示了在去除照明后增强的压电性的持续行为，这与被困在亚能级中的光载流子的重新发射有关。这些结果为用于多功能纳米光电子学的铁电薄膜中与光伏效应兼容的光致压电增强铺平了道路。
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