AI 中文总结
该研究利用MoS2/Ta2NiSe5异质结的界面对称性破缺实现巨体光伏效应，通过正交器件几何分离光响应机制，获247 A/cm²光电流密度，为相关器件优化提供新策略。
AI 中文摘要
范德华（vdW）异质结为通过界面对称性破缺调控非常规体光伏（BPV）效应提供了多功能平台。然而，结构复杂性、自发电荷转移和强层间耦合所驱动的多种光物理机制共存，常掩盖BPV响应的微观起源，阻碍其合理优化。本文中，我们在十字形MoS2/Ta2NiSe5 vdW异质结的重叠区域观测到显著的BPV效应，垂直堆叠诱导的对称性破缺打破了MoS2的反演中心。正交器件几何结构可独立探测层内与界面光响应路径，便于清晰区分竞争机制。MoS2与Ta2NiSe5间的自发界面电荷转移进一步建立了强层间电子耦合。通过栅极电压和垂直电场调控层间势垒，我们实现了247 A/cm²的优化零偏置光电流密度和0.99 V⁻¹的BPV系数。理论建模支持下，结果表明极简器件几何结构可将复杂异质结转化为实验易处理的平台，该策略为分析和优化界面驱动的BPV效应铺平了道路，对自供电光电子学、宽带光电探测和能量收集纳米器件具有重要意义。
英文摘要
Van der Waals (vdW) heterostructures offer a versatile platform for engineering unconventional bulk photovoltaic (BPV) effect through interfacial symmetry breaking. However, the coexistence of multiple photophysical mechanisms, driven by structural complexity, spontaneous charge transfer, and strong interlayer coupling, often obscures the microscopic origin of the BPV response and hinders its rational optimization. Here, we demonstrate a pronounced BPV effect localized at the overlap region of a cross-bar MoS2/Ta2NiSe5 vdW heterostructure, where symmetry breaking induced by vertical stacking lifts the inversion center of MoS2. The orthogonal device geometry enables the independent probing of intralayer and interfacial photoresponse pathways, facilitating clear separation of competing mechanisms. Spontaneous interfacial charge transfer between MoS2 and Ta2NiSe5 further establishes a strong interlayer electronic coupling. By modulating the interlayer potential landscape through gate voltage and vertical electric fields, we achieve an optimized zero-bias photocurrent density of 247 A/cm2 and a BPV coefficient of 0.99 V-1. Supported by theoretical modelling, our results illustrate how minimalist device geometry can transform complex heterostructures into experimentally tractable platforms. This strategy paves the way for analyzing and optimizing interface-driven BPV effect, with implications for self-powered optoelectronics, broadband photodetection, and energy-harvesting nanodevices.
Comments18 pages, 5 figures
Journal refNature Communications (2026)
DOI：10.1038/s41467-026-76804-w
