|
ИСТИНА |
Войти в систему Регистрация |
Интеллектуальная Система Тематического Исследования НАукометрических данных |
||
Melamine holding PbI2 with three “arms”: an effective chelation strategy to control the lead iodide to perovskite conversion for inverted perovskite solar cellsстатья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: Shizi Luo, Cao Shuguang, Zheng Tongjun, Bi Zhuoneng, Zheng Yupeng, Li Yiqun, Taye Biniyam Zemene, Ozerova Victoria V., Frolova Lyubov A., Emelianov Nikita A., Tarasov Eugeniy D., Liang Zheng, Gutsev Lavrenty G., Aldoshin Sergey M., Ramachandran Bala R., Troshin Pavel A., Xu Xueqing
- Журнал: Energy and Environmental Sciences
- Год издания: 2025
- Издательство: Royal Society of Chemistry
- Местоположение издательства: United Kingdom
- DOI: 10.1039/d4ee04692g
- Аннотация: It is now well-known that moderate amounts of lead iodide (PbI2) in organic–inorganic hybrid perovskite films are capable of passivating defects and stabilizing the material. However, contrarily, excessive PbI2 instead leads to rapid degradation and thus destabilizes the perovskite solar cells (PSCs). To address this challenge, we propose to use melamine (MEA) additive to control the concentration of PbI2 in perovskite films fabricated with sequential deposition method. As demonstrated by our calculations and NMR measurement results, MEA has both donor and acceptor regions which combine well with the PbI2's surface topology: the triazine core units are capable of binding to uncoordinated lead while the amino groups of MEA are capable of coordinating with the iodide anions and effectively “trichelate” PbI2, thus passivating the defects and promoting carrier separation. Furthermore, the simultaneous introduction of MEA and cesium iodide regulated the crystallization of perovskite films, improved the degree of (111) crystal orientation, and enabled the formation of high-quality perovskite films without pinholes. As such, based on the synergistic effect of MEA and cesium iodide, we prepared inverted PSCs by sequential deposition method with a PCE of 25.66% (certified at 25.06%) and high VOC approaching 1.2 V with a steady state PCE of 25.19%. The optimized device can maintain more than 90% of the initial efficiency at the maximum power point for 1000 h. In addition, through this strategy, we also prepared a flexible device with an efficiency of up to 24.03%, which can maintain more than 90% of the initial performance after 5000 bending cycles, thus demonstrating an excellent mechanical stability.
- Добавил в систему: Алдошин Сергей Михайлович