“…Therefore, the specific detectivity of the array detectors can be estimated using the Johnson noise and shot noise-limited detectivity: ,,, where A d is the NW array area, k is Boltzmann constant, T is the temperature, and R d is the dynamic resistance which is defined as . The peak detectivity of the array with D NW tip of 81, 108, and 128 nm at 1 V is 3.8 × 10 11 , 1.2 × 10 12 , and 5.8 × 10 11 cm √Hz/W, respectively, much higher than previously reported GaAsSb NW photodetectors , and most previously reported NW array photodetectors. , Moreover, compared with previously demonstrated Si NW array-based multispectral detectors, , our GaAsSb NW detectors show not only high performance but also a much broader spectral band extending to the IR region with more than 10 channels to enhance color-matching functions. By further optimizing the NW growth as well as the substrate preparation to increase the gold disk size, such as increasing the hole size, SiO 2 thickness, and/or Au thickness, large diameter NWs with increased Sb composition can be obtained to further extend the NW array spectral response to longer wavelength.…”