Dopant-Free Ultra-Thin Spiro-OMeTAD Enables Near 30%-Efficient n–i–p Perovskite/Silicon Tandem Solar Cells. - Xue, Xiangying; Yang, Weichuang; Ying, Zhiqin; Cao, Fangfang; Zeng, Yuheng; Yang, Zhenhai; Yang, Xi; Ye, Jichun (Nano-Micro Letters, 2026)