铁基磁性半导体中的巨大体光伏效应
Giant bulk photovoltaic effect in an iron-based magnetic semiconductor.
摘要(中文译文)
高效体光伏（BPV）转换与室温铁磁性难以兼得，因为支撑磁有序的巡游电子有利于金属性输运，而BPV产生则需要具有反演对称性破缺的半导体态。在此，我们证明氧等离子体注入可将金属性FeGaTe转变为具有巨BPV响应的铁磁半导体，从而在非中心对称晶格中实现零偏压光电流产生。氧的引入使巡游Fe d电子局域化，诱导p型半导体输运和极性电子结构，而氧相关的交换路径使铁磁态在室温以上得以持续存在。所制器件表现出自发宽带光响应，短路电流密度接近30 A cm，BPV系数高达0.25 V。基于场依赖的磁阻调制，光伏电流可通过低磁场进行线性编程。利用实验校准的器件响应，我们展示了磁性可编程的特征分离和图像恢复，识别准确率达92.3%，确立了氧工程化FeGaTe作为自供电、可重构磁光电子学平台的潜力。
Abstract
Efficient bulk photovoltaic (BPV) conversion and room-temperature ferromagnetism are difficult to combine, because the itinerant electrons that support magnetic order favor metallic transport, whereas BPV generation requires a semiconducting state with broken inversion symmetry. Here, we show that oxygen-plasma implantation transforms metallic FeGaTe into a ferromagnetic semiconductor with a giant BPV response, enabling zero-bias photocurrent generation in a non-centrosymmetric lattice. Oxygen incorporation localizes itinerant Fe d-electrons, induces p-type semiconducting transport and polar electronic structure, while oxygen-associated exchange pathways allow persistent ferromagnetic state above room temperature. The resulting devices exhibit spontaneous broadband photoresponse, with short-circuit current densities approaching 30 A cm and a BPV coefficient up to 0.25 V. The photovoltaic current can be linearly programmed by low magnetic fields based on field-dependent magnetoresistive modulation. Using the experimentally calibrated device response, we demonstrate magnetically programmable feature separation and image restoration with 92.3% recognition accuracy, establishing oxygen-engineered FeGaTe as a platform for self-powered, reconfigurable magnetic optoelectronics.
如何引用
AMA
Mingliang Cheng, Zheng Wang, Jingyu Ji, Jianzhao Wang, Yiting Mo, Yijun Huang, et al. Giant bulk photovoltaic effect in an iron-based magnetic semiconductor.. Nature communications. 2026; doi:10.1038/s41467-026-74473-3.
APA
Mingliang Cheng, Zheng Wang, Jingyu Ji, Jianzhao Wang, Yiting Mo, Yijun Huang, et al (2026). Giant bulk photovoltaic effect in an iron-based magnetic semiconductor.. Nature communications. https://doi.org/10.1038/s41467-026-74473-3
GB/T 7714
Mingliang Cheng, Zheng Wang, Jingyu Ji, Jianzhao Wang, Yiting Mo, Yijun Huang, et al. Giant bulk photovoltaic effect in an iron-based magnetic semiconductor.[J]. Nature communications, 2026 doi:10.1038/s41467-026-74473-3.
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