Effects of pre-alloying process on the absorber quality for Cu2ZnSnS4 thin-film solar cells

作者：Tong, Hanyu; Xu, Bin^*; Zhu, Qiang; Lin, Jianjun; Ma, Hai; Chen, Jiaqi; Wang, Hongru; Chen, Ye; Yang, Pingxiong; Chu, Junhao; Sun, Lin

来源：Materials Science in Semiconductor Processing, 2023, 165: 107699.

DOI：10.1016/j.mssp.2023.107699

• Cu2ZnSnS4 solar cell
• Magnetron sputtering
• Pre-alloying
• Element distribution
• Crystallinity

Sulfide-kesterite Cu2ZnSnS4 absorber fabricated using magnetron sputtering method exhibits great application potential for its pure and flat precursors, great repeatability and efficient process. However, the elements dis-tribution of metallic stacked precursors is not uniform vertically and limits the efficiency of Cu2ZnSnS4 solar cells. In present work, the precursor is pre-alloyed before sulfurization to make elements interdiffuse effectively and promotes the metal elements to transform into alloying phases. Due to the improved element distribution of the precursor, Cu2ZnSnS4 phase is preferentially formed during the growth process. By pre-alloying the pre-cursor, the absorber performs better crystallinity, and the grain size of the bottom layer is improved effectively. Using this approach, the photovoltaic performance of Cu2ZnSnS4 solar cells is significantly improved, and the best cell is acquired with the efficiency of 7.28%.

• 单位
  复旦大学