Recent advancements in solar technology have highlighted the potential of silicon nanowire (SiNW) solar cells, particularly in enhancing efficiency under low sunlight conditions. A study led by Bernice Mae Yu Jeco-Espaldon from the Research Center for Materials Nanoarchitectonics (MANA) at the National Institute for Materials Science (NIMS) in Tsukuba, Japan, published in ‘Frontiers in Nanotechnology’, reveals significant findings regarding the performance of these nanostructured solar cells.
The research indicates that SiNW solar cells can achieve optimal efficiency at a concentration factor of 7.5 suns and temperatures of 40°C or lower. Under these conditions, the SiNW solar cell demonstrates a conversion efficiency that is 1.05% higher than that of conventional, unconcentrated silicon solar cells. Furthermore, when compared to traditional planar silicon solar cells under identical conditions, the SiNW cells show a remarkable 3.75% increase in efficiency.
One of the most promising applications of SiNW solar cells lies in their integration with III–V multijunction solar cell systems. The study tested a hybrid configuration where a SiNW single-junction solar cell is connected in series with a commercial dual-junction solar cell made from InGaP/GaAs. The results suggest that using a III–V upper subcell with a smaller active area than the SiNW subcell can optimize current production. This configuration is particularly advantageous for industries such as electric vehicles, where lightweight and high-performance solar cells are essential.
Jeco-Espaldon emphasizes the economic benefits of this technology, stating, “This hybrid configuration is particularly advantageous for terrestrial applications, such as electric vehicles, which demand lightweight, high-performance multijunction solar cell devices.” The potential for cost reduction is significant, especially considering the 1.8% weight reduction achieved with the SiNW solar cell compared to its planar counterpart. The research suggests that with further development, this reduction could be increased to as much as 64.5%.
The findings from this study open up new commercial opportunities in the energy sector, particularly in the design and production of solar cells that are both efficient and lightweight. As industries seek more sustainable energy solutions, the integration of nanostructured silicon solar cells could play a crucial role in meeting these demands. For more information on the research and its implications, you can visit MANA.
