Broadband GaAsSb Nanowire Array Photodetectors for Filter-Free Multispectral Imaging

作者：Ziyuan Li, Simeon Trendafilov, Fanlu Zhang, Monica Allen, Jeffery Allen, Sukrith Dev, Wenwu Pan, Yang Yu, Qian Gao, Xiaoming Yuan, Inseok Yang, Yi Zhu, Anha Bhat, Sherry X. Peng, Wen Lei, Hark Hoe Tan, C. Jagadish, Lan Fu · 发表于：Nano Letters · 年份：2021 · DOI：10.1021/acs.nanolett.1c02777 · 被引用次数：84 · 研究领域：Nanowire Synthesis and Applications、Advanced Semiconductor Detectors and Materials、Semiconductor Quantum Structures and Devices

Highly compact, filter-free multispectral photodetectors have important applications in biological imaging, face recognition, and remote sensing. In this work, we demonstrate room-temperature wavelength-selective multipixel photodetectors based on GaAs 0.94 Sb 0.06 nanowire arrays grown by metalorganic vapor phase epitaxy, providing more than 10 light detection channels covering both visible and near-infrared ranges without using any optical filters. The nanowire array geometry-related tunable spectral photoresponse has been demonstrated both theoretically and experimentally and shown to be originated from the strong and tunable resonance modes that are supported in the GaAsSb array nanowires. High responsivity and detectivity (up to 44.9 A/W and 1.2 × 10 12 cm √Hz/W at 1 V, respectively) were obtained from the array photodetectors, enabling high-resolution RGB color imaging by applying such a nanowire array based single pixel imager. The results indicate that our filter-free wavelength-selective GaAsSb nanowire array photodetectors are promising candidates for the development of future high-quality multispectral imagers.