Unveiling Sodium Diffusion Kinetics and Locking Mechanisms for High‐Performance CZTSSe Photovoltaics by Shuyu Li, Chaoran Li, Chu Liu, Jiachen Wu, Letu Siqin, Yuan Li, Guonan Cui, Yanchun Yang, Ruijian Liu, Hongmei Luan, Chengjun Zhu

“…The optimized absorber architecture features laterally expanded grains with reduced boundary density and homogenized interfacial charge transport pathways, yielding the highest reported efficiency of 13.22% for Na‐doped CZTSSe solar cells to date, marked by synergistic enhancements in both VOC and FF. …”
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