Kesterite tech news
JinkoSolar Holding Co., Ltd. (NYSE: JKS) announced on September 7, 2026, the pilot production of its "Eagle K" bifacial modules, the first commercial--scale application of Kesterite (CZTS) as a rear--side passivation and contact layer. By substituting traditional silver--based back--surface fields with a proprietary Kesterite compound, the "Eagle K" achieves a 15% reduction in metallization costs while maintaining a 23.2% bifaciality rating. This innovation directly addresses the solar industry's long--term silver supply constraints and establishes a sustainable, earth--abundant material pathway for high--efficiency utility--scale modules.