The result was certified by Japan’s National Institute of Advanced Industrial Science and Technology (AIST).
May 18, 2026
Researchers from Tokyo City University in Japan claim to have achieved a world record power conversion efficiency for a tandem solar cell based on a top perovskite device and a bottom cell based on copper, indium, gallium and selenium (CIGS).
The tandem device has a two-terminal (2T) configuration, an active area of 1 cm2, and an certified efficiency of 25.14%. The result was verified by Japan's National Institute of Advanced Industrial Science and Technology (AIST).
The previous world record of 24.6% was achieved by German research institute HZB in Febuary 2025. “Since then, improvement research has been conducted around the world, but the 25% barrier had not been broken,” the Japanese team stated.
