Chinese researchers have developed a new "healing" treatment to enhance the performance of perovskite-silicon tandem solar cells. These cells combine perovskite and silicon materials to capture more sunlight and convert it into electricity. The treatment helped achieve a certified efficiency of 30.77%, which is a significant improvement in solar cell technology, while also improving the stability of the devices. The research was led by scientists at Nanjing University and published in the journal Nature Communications under the title Intervention of healing to improve the efficiency and stability of tandem devices on industrial textured silicon. The study focuses on improving the quality of perovskite films deposited on industrial textured silicon, a material commonly used in solar cells. Textured silicon has microscopic pyramids on its surface that reduce light reflection and help capture more solar energy, but these textures make it challenging to apply uniform perovskite layers. To overcome this challenge, the researchers used a compound called methylammonium thiocyanate (MASCN) on the perovskite film after it was formed. This treatment encouraged additional crystal growth while ensuring the perovskite layer covered the textured silicon surface evenly. The process involved creating solar cells from n-type silicon wafers, depositing layers of hydrogenated amorphous silicon and indium-tin oxide (ITO) for the bottom cell, and applying lead iodide and cesium bromide to the front surface. The top perovskite layer was formed using formamidinium iodide and bromide, with MASCN applied afterward to enhance its structure. After applying MASCN, the devices were heated to 90 °C under nitrogen and then annealed at 150 °C in air. Additional layers, such as a passivation treatment, a C60 electron transport layer, tin oxide, an indium-zinc oxide (IZO) transparent electrode, silver contacts, and a magnesium fluoride anti-reflective coating, were added to complete the cell structure. The final device included layers such as a silver back contact, ITO, the bottom silicon cell, a second ITO layer, a nickel oxide hole transport layer, a self-assembled monolayer, and a wide bandgap perovskite absorber. The researchers tested the cells using scanning electron microscopy and X-ray measurements to assess the film's quality and crystal structure. The perovskite wide bandgap cells reached a record efficiency of 21.1%, contributing to the overall certified stable tandem efficiency of 30.77% and an open-circuit voltage of 1.915 V on an active area of 1.164 cm². An encapsulated device maintained its initial performance after 3,400 hours of continuous operation under standard light conditions, demonstrating the long-term stability of the new design. This study offers a promising technique to improve the efficiency and stability of perovskite-silicon tandem solar cells, addressing key limitations in current solar technology.