<p>This research paper aims to examine and analyze the impact of varying the radius of ultra-thin horizontal nucleated silicon (Si) nanowires (NWs) on the performance of solar cells (SCs). Two different methods are employed in order to enhance the current density. The SiNWs are designed in a circular shape with an amorphous core. The first method utilizes a semi-periodic array to take advantage of the optical antenna effect, while the second method involves incorporating several cored circular NWs with different radii to improve bandwidth absorption. The results show that the introduction of circular NWs with different radii leads to an increase in light absorption by utilizing the inherent disorder. Furthermore, the use of irregular arrays of NWs enables enhanced light absorption without the need for additional absorption material. The optimization of NWs is carried out to determine the optimal position and radius, maximizing their efficiency. This study emphasizes the importance of disorder and irregularity in achieving broadband absorption in laterally assembled Si NW SCs. The findings suggest that irregular NW arrays, with their ability to support more cavity modes and broaden the absorption spectra through scattering, offer the greatest enhancement for broadband absorption. Compared to other broadband structures, optimized irregular NW arrays exhibit favorable characteristics. By utilizing irregular NW arrays, it becomes possible to enhance the absorption capabilities of SCs without the need for additional absorbing material.</p>