Recent emerging developments have demonstrated that bismuth ferrite is one of the promising lead-free perovskite materials used in solar energy harvesting devices and photodetectors. This work reports high short-circuit photocurrent densities of ∼1.2 × 10³ and ∼0.55 × 10³ μA/cm² in a p-type gadolinium-doped BiFeO₃ ceramic with n-type indium tin oxide under 405 nm irradiation and sunlight at 10² mW/cm² intensity, respectively. Polarization-enhanced photoresponsivity of ∼5.4 × 10^–2 A/W and specific detectivity of ∼1.5 × 10¹¹ Jones were achieved with response times of ∼1 and ∼10 ms, respectively, at the rising and decaying edges. Enhanced photovoltaic conversion via a prior electric-field poling can be attributed to the p–n junction and the field-modulated Schottky barrier in conjunction with domain nucleation, ordered polar nanoregions, and increased O 2p–Fe 3d orbital hybridization. The network of domain walls and grain boundaries serves as conduction pathways for the photogenerated charge carriers. The improved photocurrent in gadolinium-doped BiFeO₃ opens up an opportunity for using bismuth ferrite materials in self-powered photodetectors.

中文翻译：

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通过极性有序工程提高铋铁氧体中的光伏和光敏性能

最近出现的事态发展表明，铁酸铋是太阳能收集设备和光电探测器中使用的有前途的无铅钙钛矿材料之一。这项工作报告的〜1.2×10高的短路光电流密度³和~0.55×10 ³ μA/厘米²在p型钆掺杂的BiFeO ₃ 405nm的照射和阳光下在陶瓷与n型的铟锡氧化物强度分别为10 ² mW / cm ²。极化增强的光敏度约为5.4×10 ^–2 A / W，比检测率约为1.5×10 ¹¹在上升沿和衰减沿分别获得约1毫秒和约10毫秒的响应时间来实现琼斯。通过先前的电场极化增强的光电转换可以归因于p–n结和场调制的肖特基势垒，以及畴核，有序极性纳米区域和增加的O 2 p – Fe 3 d轨道杂交。畴壁和晶界的网络充当光生电荷载流子的传导路径。掺g的BiFeO _3中改善的光电流为在自供电光电探测器中使用铁酸铋材料开辟了机会。