I. In this study, the lengths of nanowires have been kept constant at the value of reference solar cell height for a fair comparison. Nanowire length can significantly impact their light concentration and scattering properties.
Hence, the effect of the length of nanowires also needs to be analyzed in further study.
II. The recombination parameters of bulk solar cells are used for different layers of studied nanowire solar cells. It has been shown that nanowire structures can have significantly different recombination properties. Due to the unavailability of recombination data, particularly for nanostructures, the simulation has been carried out using bulk solar cell parameters. Further study regarding the theoretical and experimental evaluation of nanowires’
recombination parameters is required to benchmark the used model more effectively.
III. The benchmarking of the simulation model has been done using planar cells since experimental nanowire cells of the same materials were not available in the literature. Upon the availability of experimental axial junction NW SCs based on studied materials, further model verification is necessary.
IV. The nanowires used throughout this study have circular cross-sections. The influence of elliptical or parabolic cross-sections requires further analysis.
Moreover, cylinders with varying cross-section or conical shapes have been shown to offer different degrees of light trapping due to the presence of various diameter-dependent resonance modes. This leads to improved absorption over a range of wavelengths depending on the diameter. Such shapes need to be investigated as solar cell absorbers in upcoming work.
V. The nanopillars are arranged in a square array for this work. Hexagonal or random arrangements can be the matter of subsequent study. Moreover,
71
inclined nanowires in place of vertical nanowires or a mixture of both need to be analyzed as they can significantly impact omnidirectionality.
72
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