Kesterite tech news
On October 17, 2026, researchers published a study in Advanced Functional Materials demonstrating a synergistic lithium–aluminum (Li–Al) co--doping strategy to resolve critical defect and carrier transport bottlenecks in earth--abundant kesterite (${\text{Cu}}2{\text{ZnSn(S,Se)}}4$ or CZTSSe) thin--film solar cells. While kesterite absorbers present an environmentally benign, supply--chain--resilient alternative to cadmium telluride and perovskite photovoltaics, commercial scaling has been hindered by severe open--circuit voltage ($V{\text{OC}}$) deficits driven by deep--level defect complexes—notably $[2{\text{Cu}}{\text{Zn}} + {\text{Sn}}_{\text{Zn}}]$ clusters—and insufficient majority--carrier density. By implementing targeted Li–Al co--incorporation into the absorber lattice, the researchers suppressed harmful antisite defect formation, reduced severe band tailing to an Urbach energy of 17.57 meV, and improved majority carrier concentration without disrupting bulk charge extraction. The resulting architecture achieved a power conversion efficiency exceeding 15% while demonstrating high operational endurance across more than 3,900 hours of continuous stability testing.