High-performance polarization-sensitive photodetectors based on aligned-CNT/WSe₂ heterojunctions

Benefiting from their unique quasi-one-dimensional structure, tunable bandgap, large specific surface area and controllable directional growth features, carbon nanotubes (CNTs) are considered promising candidates for high-performance polarized photodetection. However, most photodetectors reported to date based on CNT films still deliver relatively low polarization anisotropy ratios, which severely restricts their practical deployment. In this work, we fabricate a novel polarization-sensitive photodetector based on a one-dimensional (1D)/two-dimensional (2D) heterostructure composed of highly aligned, horizontally arranged, densely packed-CNTs and WSe₂. The device achieves a high responsivity of 10.6 A/W at 550 nm together with a response time of 2.5 ms. Notably, it displays strong polarization-dependent absorption in the 660-920 nm wavelength range. Under self-powered operating conditions, the maximum linear polarization anisotropy ratio reaches 2.9 at 880 nm. This work lays an experimental foundation for the construction of high-performance polarization photodetectors utilizing 1D/2D aligned-CNT/semiconductor p-n junctions.