Zhang Yuning, Yu Bo, Sun Yapeng, Zhang Jiankai, Su Zhan, Yu Huangzhong
School of Physics and Optoelectronics, South China University of Technology, 510640, Guangzhou, China.
International School of Microelectronics, Dongguan University of Technology, 523808, Dongguan, Guangdong, China.
Angew Chem Int Ed Engl. 2024 Jul 1;63(27):e202404385. doi: 10.1002/anie.202404385. Epub 2024 Jun 3.
The interface of perovskite solar cells (PSCs) plays an important role in transferring and collecting charges. Interface defects are important factors affecting the efficiency and stability of PSCs. Here, the buried interface between SnO and the perovskite layer is bridged by two-dimensional (2D) MBene, which improves charge transfer. MBene can deposit additional electrons on the surface of SnO, passivate its surface defects and facilitate the charge collection. Moreover, the dipole moment formed at the interface increases the electron transfer ability in the PSCs. MBene also regulates the growth of perovskite crystals, improves the quality of perovskite films, and reduces its grain boundary defects. As a result, PSCs based on FAMAPbI and (FAPbI)(MAPbBr) get the enhanced efficiencies of 22.34 % and 24.32 % with negligible hysteresis. Furthermore, the optimized device exhibits better stability. This work opens up the application of MBene materials in PSCs, reveals a deeper understanding of the mechanism behind using 2D materials as an interface modification layer, and shows opportunities for using MBene as potential material in photoelectric devices.
钙钛矿太阳能电池（PSCs）的界面在电荷转移和收集过程中起着重要作用。界面缺陷是影响PSCs效率和稳定性的重要因素。在此，二维（2D）MBene桥接了SnO与钙钛矿层之间的掩埋界面，从而改善了电荷转移。MBene可以在SnO表面沉积额外的电子，钝化其表面缺陷并促进电荷收集。此外，在界面处形成的偶极矩提高了PSCs中的电子转移能力。MBene还调控钙钛矿晶体的生长，提高钙钛矿薄膜的质量，并减少其晶界缺陷。结果，基于FAMAPbI和(FAPbI)(MAPbBr)的PSCs获得了增强的效率，分别为22.34%和24.32%，滞后现象可忽略不计。此外，优化后的器件表现出更好的稳定性。这项工作开启了MBene材料在PSCs中的应用，揭示了对将二维材料用作界面修饰层背后机制的更深入理解，并展示了将MBene用作光电器件潜在材料的机会。
