Cage polyamine molecule modulating the buried interface of tin oxide/perovskite in photovoltaic devices
Cage polyamine molecule modulating the buried interface of tin oxide/perovskite in photovoltaic devices
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DOI：
10.1016/j.nanoen.2023.108939
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发表时间：
2023-09
期刊：
影响因子：
17.6
通讯作者：
Jingxu Tian;Jihuai Wu;Ruoshui Li;Yu Lin;Jialian Geng;Wenhui Lin;Y. Wang;Ouyang Qiang;
中科院分区：
文献类型：
--
作者：
Jingxu Tian;Jihuai Wu;Ruoshui Li;Yu Lin;Jialian Geng;Wenhui Lin;Y. Wang;Ouyang Qiang;
分子调节最近已成为改善钙钛矿太阳能电池（PSC）性能和稳定性的有效策略。然而，迄今为止，具有氮杂环多孔结构的笼型多胺很少用作调节剂。在此，笼状聚胺分子1,4-二氮杂双环[2.2.2]辛烷（DABCO）作为调制剂被插入电子传输层和钙钛矿层之间的埋入界面中。通过剥离掩埋界面来确定钙钛矿底层的情况。 DABCO 的嵌入不仅钝化了缺陷，导致陷阱态密度降低了 54%；还能辅助钙钛矿晶体生长，缓解晶格拉应力；以及优化功能层的能级排列。因此，DABCO 优化的 PSC 实现了 23.6% 的功率转换效率以及出色的稳定性，而原始 PSC 的功率转换效率为 20.5%。该研究为在PSCs中利用笼多胺提供了一种典型的分子调节方法。
Molecular modulating have recently emerged as an effectual strategy for ameliorating the performance and stability of perovskite solar cells (PSCs). However, to date cage polyamine with nitrogen heterocyclic porous structure is rarely used as the modulator. Herein, a cage polyamine molecule 1,4-diazabicyclo[2.2.2]octane (DABCO) as modulator is intercalated into the buried interface between electron transport layer and perovskite layer. The situation of the perovskite bottom layer is ascertained by peeling off the buried interfaces. The intercalation of DABCO not only passivates the defect, resulting in a 54 % decrease in trap-state density; but also assists the crystal growth of perovskite, relieves lattice tensile stress; as well as optimizes the energy level alignment of the functional layers. As a result, the DABCO optimized PSC achieves a power conversion efficiency of 23.6 % along with excellent stability, compared to 20.5% for the pristine PSC. The research provides a typical molecular modulating to utilize cage polyamine in PSCs.