Controllable polarity photoresponse and imaging based on MoS₂/MLG/MoTe₂ heterostructure

作者：Xiaoyan Liu, Changyi Pan, Ni Sheng, Shuangli Mi, Xuhao Fan, Changlong Liu, Tianning Zhang, Yufeng Shan, Jiaqi Zhu, Shaowen Xu, Wanli Yang, Chixian Liu, T.M. Chen, Huiyong Deng, Ning Dai · 发表于：Nano Research · 年份：2025 · DOI：10.26599/nr.2025.94907489 · 被引用次数：6 · 研究领域：2D Materials and Applications

The realization of controllable polarity photoresponse within a single device is a crucial advancement for simulating biological bipolar vision cells to drive the development of next-generation optoelectronic technologies. Nevertheless, current polarity photodetectors face significant challenges in fully suppressing symmetric photocurrent cancellation and optimizing carrier transport efficiency. Here, we propose a graphene-intercalated MoS 2 /MoTe 2 heterojunction, featuring a tailorable built-in electric field and a high efficiency transport channel. Spatially resolved photocurrent reveals that the controllable polarity photoresponse originates from the bias-dependent equivalent built-in electric field of MoS 2 /MLG/MoTe 2 heterojunction. The controllable polarity photoresponse realizes a large-area uniform “heart-shaped” photocurrent region. In enhanced polarity photoresponse mode, the photodetector exhibits broadband detection capabilities from visible (638 nm) to infrared (1550 nm) light, achieving a high responsivity of 18.1 A/W and an excellent detectivity of 2.8 × 10 12 Jones, as well as fast response times of 94/119 µs. Furthermore, precise imaging with a resolution better than 0.5 mm was successfully demonstrated, highlighting its polarity photoresponse for practical imaging applications. This work provides a new paradigm for controllable polarity photoresponse programmed by intercalated low-dimensional material structures, paving the way for next-generation intel...