Copper, zinc, tin, and selenium sulfur is a novel thin-film photovoltaic material with great potential. However, there is a problem: as long as the device is made larger, the film is prone to uneven thickness, and the photoelectric conversion efficiency “shrinks” accordingly. Researchers in China have overcome this problem and developed a solution coating process suitable for large-scale continuous production. A highly uniform copper-zinc-stin-selenium film was produced on a 10-square-centimeter substrate. The photoelectric conversion efficiency of the final photovoltaic module reached 13.0%, setting a new world record for the efficiency of such modules in one fell swoop.

Copper, zinc, tin, and selenium sulfur is a novel thin-film photovoltaic material with great potential. However, there is a problem: as long as the device is made larger, the film is prone to uneven thickness, and the photoelectric conversion efficiency “shrinks” accordingly. Researchers in China have overcome this problem and developed a solution coating process suitable for large-scale continuous production. A highly uniform copper-zinc-stin-selenium film was produced on a 10-square-centimeter substrate. The photoelectric conversion efficiency of the final photovoltaic module reached 13.0%, setting a new world record for the efficiency of such modules in one fell swoop.