Figure 2From: Design parameters for enhanced photon absorption in vertically aligned silicon nanowire arraysMeasured absorption spectra for bulk silicon and GeNW arrays and simulated spectral absorbance. (a) Absorption spectra for bulk silicon and a GeNW array with NWs of 2 µm in length, 80 nm in diameter and 150 nm pitch situated on a glass substrate. The measured GeNW spectrum was extracted from Fan et al. [25]. The spectra were measured and simulated with a homogenous, non-wavelength-dependent illumination and are therefore not weighted with an AM1.5G spectrum. (b) Simulated spectral absorbance for a substrate-free SiNW array equal in its arrangement to the aforementioned GeNW array and in comparison to a Si membrane of 2 µm in thickness.Back to article page