Solar photovoltaic efficiency and cost advancements

Developments in solar technology are focusing on increasing photovoltaic efficiency and reducing manufacturing costs through both theoretical research and material innovation.

Initial efforts involve investigating ways to bypass the Shockley-Queisser limit by utilizing ‘hot electrons’ to prevent energy loss as heat. In the commercial sector, All Back Contact (ABC) technology has been implemented to improve light absorption by moving electrical contacts to the rear of the cell, with manufacturers reporting efficiencies near 24 percent.

Subsequent advancements include the use of Prussian Blue nanoparticles to stabilize perovskite films, specifically formamidinium lead iodide (FAPbI3), achieving efficiencies of up to 26.9 percent while addressing structural instability, defect formation, and ion migration. Additionally, researchers have developed a screen-printed silver-nickel paste for TOPCon solar cells. This innovation aims to reduce rear-side metallization costs by approximately 11 percent by partially replacing expensive silver with nickel, maintaining average cell efficiencies of 26.67 percent during production trials.

New research is also targeting energy loss mechanisms. In Barcelona, investigators identified a light leakage problem where radiation escapes a device before conversion, suggesting a theoretical efficiency could reach nearly 43 percent by controlling radiation exit. Meanwhile, researchers in Germany using the Hawk supercomputer discovered that certain silicon defects, specifically dangling bonds at the interface between silicon and an organic semiconductor layer, may facilitate singlet fission. This process could allow a single high-energy photon to generate two electrons instead of one, potentially preventing energy loss as heat.