钙钛矿(结构)
半导体
钝化
冠醚
掺杂剂
材料科学
能量转换效率
图层(电子)
兴奋剂
光电子学
电导率
化学工程
纳米技术
化学
工程类
有机化学
物理化学
离子
作者
Kaixing Chen,Huiqiang Lu,Yang Yang,Shufang Li,Kangkang Jia,Fei Wu,Linna Zhu
出处
期刊:Solar RRL
[Wiley]
日期:2022-12-18
卷期号:7 (4)
被引量:5
标识
DOI:10.1002/solr.202200987
摘要
In conventional (n‐ i ‐p) perovskite solar cells (PSCs), spiro‐OMeTAD is the most widely used hole‐transporting material (HTM), which contributes to the current state‐of‐the‐art efficiency. Suffering from the low conductivity, dopants such as LiTFSI (lithium bis(trifluoromethanesulfonyl)imide) and tBP are usually required to achieve excellent hole transport properties in spiro‐OMeTAD. Nevertheless, the hygroscopicity and the migration of Li + during device operation severely affect the device's stability. To address the aforementioned issue, a 12‐crown‐4‐based organic semiconductor (CDT) is synthesized and applied in PSCs. Notably, CDT is simultaneously doped in spiro‐OMeTAD and perovskite layer through the antisolvent method. In this way, the strong “host‐guest” interaction between crown ether and Li + effectively inhibits its migration both in the hole transporting layer (HTL) and at the perovskite/HTM interface. Furthermore, the carbazole diphenylamine group in CDT facilitates hole transport, and meanwhile improves the hydrophobicity of the HTL. In addition, CDT added into the perovskite layer is also able to passivate defects by interacting with the undercoordinated Pb 2+ . In light of the aforementioned advantages, the CDT‐based device shows a high power conversion efficiency approaching 23%, with excellent long‐term stability.
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