Zhang Ke, Wei Yang, Zhang Jin, Ma He, Yang Xinhe, Lu Gaotian, Zhang Kenan, Li Qunqing, Jiang Kaili, Fan Shoushan
State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics and Tsinghua-Foxconn Nanotechnology Research Center, Tsinghua University, Beijing 100084, China.
State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics and Tsinghua-Foxconn Nanotechnology Research Center, Tsinghua University, Beijing 100084, China;
Proc Natl Acad Sci U S A. 2019 Apr 2;116(14):6586-6593. doi: 10.1073/pnas.1817229116. Epub 2019 Mar 19.
Low-dimensional nanomaterials, such as one-dimensional (1D) nanomaterials and layered 2D materials, have exhibited significance for their respective unique electronic and optoelectronic properties. Here we show that a mixed-dimensional heterostructure with building blocks from multiple dimensions will present a synergistic effect on photodetection. A carbon nanotube (CNT)-[Formula: see text]-graphene photodetector is representative on this issue. Its spatial resolution can be electrically switched between high-resolution mode (HRM) and low-resolution mode (LRM) revealed by scanning photocurrent microscopy (SPCM). The reconfigurable spatial resolution can be attributed to the asymmetric geometry and the gate-tunable Fermi levels of these low-dimensional materials. Significantly, an interference fringe with 334 nm in period was successfully discriminated by the device working at HRM, confirming the efficient electrical control. Electrical control of spatial resolution in CNT-[Formula: see text]-graphene devices reveals the potential of the mixed-dimensional architectures in future nanoelectronics and nano-optoelectronics.
低维纳米材料，如一维（1D）纳米材料和层状二维材料，因其各自独特的电子和光电特性而展现出重要意义。在此我们表明，由多个维度的构建单元组成的混合维度异质结构将对光探测呈现出协同效应。碳纳米管（CNT）-[化学式：见原文]-石墨烯光探测器在这一问题上具有代表性。通过扫描光电流显微镜（SPCM）揭示，其空间分辨率可在高分辨率模式（HRM）和低分辨率模式（LRM）之间进行电切换。可重构的空间分辨率可归因于这些低维材料的不对称几何结构和栅极可调费米能级。值得注意的是，在HRM模式下工作的该器件成功分辨出了周期为334 nm的干涉条纹，证实了有效的电控制。CNT-[化学式：见原文]-石墨烯器件中空间分辨率的电控制揭示了混合维度架构在未来纳米电子学和纳米光电子学中的潜力。
