近日，西安交通大学王栋东团队揭示了L-瓜氨酸作为调节钙钛矿太阳能电池埋藏界面的有效分子桥可实现高效和良好的稳定性。相关论文于2025年5月19日发表在《德国应用化学》杂志上。

抑制SnO₂和钙钛矿界面的缺陷对于制造具有商业化所需寿命和效率的大面积n-i-p钙钛矿太阳能电池（PSC）至关重要。研究组报告了L-瓜氨酸（CIT）的使用，它在SnO₂胶体分散过程中具有氨基酸（-COOH，-NH₂）和尿素（-NH-CO-NH₂）基团，作为分子桥来调节SnO₂/钙钛矿埋界面。 

氨基酸基团可以有效地与Sn⁴⁺配位，钝化SnO₂的氧空位缺陷，尿素基团可以与未配位的Pb²⁺和I^-相互作用。这些相互作用不仅提高了SnO₂的电子迁移率，还促进了更大粒径钙钛矿薄膜的形成。此外，它们还可以抑制过量PbI2和非光敏δ相的产生，从而抑制陷阱辅助的非辐射复合。

因此，CIT的加入有助于在PSC中实现25.95%（0.07065 cm2）的最优功率转换效率（PCE），并提高保质期/光浸泡稳定性。当与空气中的无溶剂槽模涂层技术相结合时，太阳能模块（23.26 cm²）可以实现22.70%的PCE，这是迄今为止报告的最高PCE之一。

附：英文原文

Title: Employment of L-Citrulline as an Effective Molecular Bridge for Regulating the Buried Interface of Perovskite Solar Cells to Achieve High Efficiency and Good Stability

Author: ChaoBo Hao, Ruoyao Xu, Boyang Li, Yi Chen, QingYu Jia, ZhiQiang Wang, JiangXue Pei, BoHua Zhang, Yaqiong Su, Jingrui Li, Hua Dong, ZhaoXin Wu, Alex K.-Y. Jen, DongDong Wang

Issue&Volume: 2025-05-19

Abstract: Suppressing the defects from SnO2 and perovskite interface is essential for the fabrication of large-area n-i-p perovskite solar cells (PSCs) with the needed lifetime and efficiency for commercialization. Here, we report the employment of L-Citrulline (CIT), which has amino acid (-COOH, -NH2) and urea (-NH-CO-NH2) groups during SnO2 colloidal dispersion to function as a molecular bridge to modulate the SnO2/perovskite buried interface. The amino acid group can effectively coordinate with Sn4+ to passivate the oxygen vacancy defects of SnO2, and the urea group can interact with uncoordinated Pb2+ and I-. These interactions not only improve the electron mobility of SnO2 but also facilitate the formation of larger grain-size perovskite film. In addition, they can also inhibit the generation of excess PbI2 and the non-photoactive δ phase to result in suppressed trap-assisted non-radiative recombination. Consequently, the incorporation of CIT helps achieve a champion power conversion efficiency (PCE) of 25.95% (0.07065 cm2) in PSC with improved shelf-life/light soaking stability. When combined with an anti-solvent-free slot-die coating technique in air, the solar modules (23.26 cm2) could achieve a PCE of 22.70%, which is among the highest PCE reported so far.

DOI: 10.1002/anie.202508169

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202508169