Researchers at the National University of Singapore, led by Assistant Professor Hou Yi, have developed a vapour-deposition method for perovskite-silicon tandem solar cells. This approach specifically targets industrial micrometre-textured silicon wafers that are utilized in commercial manufacturing. In this approach, a specialized molecule enhances the adsorption of organic precursors, enabling uniform film growth on textured surfaces. The cells have achieved a power-conversion efficiency exceeding 30%, along with stability surpassing 2,000 hours of operation. The cells have also provided T90 lifetimes greater than 1,400 hours at 85°C under 1-sun illumination. The devices maintain their performance for more than 1,000 hours under continuous illumination at elevated temperatures. This work demonstrates compatibility with industrial wafer structures, as opposed to substrates tailored for laboratory use. The researchers have indicated that the next phase of development involves scaling from small cells to large-area modules.