光电探测器
光电流
材料科学
异质结
光电子学
铁电性
极化
光电效应
极化(电化学)
紫外线
比探测率
光伏系统
电介质
电气工程
暗电流
化学
物理化学
工程类
作者
Malik Ashtar,Mohsin Ali Marwat,Zhetao Li,Yibin Ying,Dawei Cao
标识
DOI:10.1016/j.jlumin.2023.119855
摘要
Ferroelectric materials with significant remnant electric polarization have recently gained research focus for the fabrication of self-power photodetectors due to their photovoltaic effect. However, the photodetectors based on ferroelectric materials display poor performance owing to their weak photovoltaic effect of the ferroelectric depolarization field (Ed) on photo-generated charge carrier separation. In this work, we fabricate self-powered photodetectors based on CuBi2O4/PZT heterostructure. The heterojunction reveals a photoresponsivity of 0.24 mA/W and a detectivity of 2.40 × 1010 Jones under 0 V bias with a maximum 7.51 μW/cm2 illumination intensity at 425 nm, which is substantially improved compared to PZT-only device. The observed rise and fall time of the composite CuBi2O4/PZT thin film is around 24 and 46 ms, respectively, which is faster than that of PZT photodetector (67 and 106 ms). Moreover, the photocurrent CuBi2O4/PZT of device is observed to be 12.7 × 10−10 A in the downpoling state and 6.28 × 10−10 A in upward poling state, revealing that the direction of polarization field can modulate the photocurrent. This work provides a promising strategy for fabricating ferroelectric heterojunction photodetectors with enhanced performance.
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