南昌大学姚凯团队报道了全织构钙钛矿/硅串联太阳能电池的表面分子工程。相关研究成果发表在2024年6月11日出版的国际知名学术期刊《德国应用化学》。

考虑到其光学优势和低制造成本，基于工业直拉硅晶片开发大规模单片钙钛矿/硅串联器件可能不得不采用双面纹理织构。然而，在溶液处理的钙钛矿中广泛用于调节界面性质的表面工程策略，并不直接适用于微米织构。

该文中，研究人员设计了一种通过动态喷涂（DSC）氟化噻吩甲基铵配体的表面钝化策略，其结合了在纹理表面提供保形覆盖和抑制相转化的优点。从分子工程的角度来看，理论计算和实验结果表明，引入三氟甲基形成偶极层，通过强相互作用和能量排列提供更有效的表面钝化。

因此，这种双功能分子的DSC处理使基于工业硅片的串联电池，能够实现30.89%的经认证的稳定功率转换效率。此外，封装器件在600小时连续照明后保持了97%以上的初始性能，显示出优异的运行稳定性。

附：英文原文

Title: Surface Molecular Engineering for Fully Textured Perovskite/Silicon Tandem Solar Cells

Author: Jun Chen, Shaofei Yang, Long Jiang, Ke Fan, Zhiliang Liu, Wentao Liu, Wei Li, Haitao Huang, Hong Zhang, Kai Yao

Issue&Volume: 11 June 2024

Abstract: Developing large-scale monolithic perovskite/silicon tandem devices based on industrial Czochralski silicon wafers will likely have to adopt double-side textured architecture, given their optical benefits and low manufacturing costs. However, the surface engineering strategies that are widely used in solution-processed perovskites to regulate the interface properties are not directly applicable to micrometric textures. Here, we devise a surface passivation strategy by dynamic spray coating (DSC) uorinated thiophenethylammonium ligands, combining the advantages of providing conformal coverage and suppressing phase conversion on textured surfaces. From the viewpoint of molecular engineering, theoretical calculation and experimental results demonstrate that introducing trifluoromethyl group provide more effective surface passivation through strong interaction and energy alignment by forming a  dipole layer. Consequently, the DSC treatment of this bifunctional molecule enables the tandem cells based on industrial silicon wafers to achieve a certified stabilized power conversion efficiency of 30.89%. In addition, encapsulated devices display excellent operational stability by retaining over 97% of their initial performance after 600h continuous illumination.

DOI: 10.1002/anie.202407151

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202407151