高効率CZTSSe太陽電池を実現する新戦略で画期的成果（Researchers Achieve Breakthrough Efficiency for CZTSSe Solar Cells Using Novel Strategy）

2026-02-26 中国科学院（CAS）

＜関連情報＞

• https://english.cas.cn/newsroom/research-news/202602/t20260226_1151206.shtml
• https://www.nature.com/articles/s41560-026-01987-x

ケステライト太陽電池におけるLi2SnS3界面を介して粒成長を制御し、認証効率が15%を超える Regulating grain growth via Li2SnS3 interphase in kesterite solar cells with certified efficiencies exceeding 15%

Changcheng Cui,Yimeng Li,Hao Wei,Xiaofan Du,Zhipeng Shao,Dongxing Kou,Zucheng Wu,Shengren Xia,Xiaopeng Feng,Shuping Pang,Xiao Wang,Sui Mao,Hao Xin,Sixin Wu & Guanglei Cui
Nature Energy  Published:25 February 2026
DOI:https://doi.org/10.1038/s41560-026-01987-x

Abstract

The selenization reaction process is the key step in determining the quality of Cu₂ZnSn(S,Se)₄ thin films. Imbalanced migration kinetics of metal ions during selenization led to high concentrations of deep-level defects, resulting in dramatic open-circuit voltage loss. In this work, we reported a Li₂SnS₃ interphase strategy to modify cation migration paths and balance Zn²⁺/Sn⁴⁺ migration differences. The Li₂SnS₃ interphase selectively encapsulates the Cu₂Sn(S,Se)₃ intermediate grains, serving as the rate-determining layer for ion migration. The Zn²⁺/Sn⁴⁺ migration barrier difference in the interphase decreases from 0.41 eV in Cu₂Sn(S,Se)₃ to 0.21 eV in Li₂SnS₃, which promotes the formation of larger, uniform, high-crystallinity grains. As a result, device efficiency improves from 13.86% to 15.45% (certified at 15.04%), and open-circuit voltage reaches 602 mV at a bandgap of 1.10 eV.