Influence of donor units on spiro[fluorene-9,9′-xanthene]-based dopant-free hole transporting materials for perovskite solar cells
Influence of donor units on spiro[fluorene-9,9′-xanthene]-based dopant-free hole transporting materials for perovskite solar cells
复制标题
供体单元对钙钛矿太阳能电池螺[芴-9,9-呫吨]基无掺杂空穴传输材料的影响
DOI：
10.1016/j.solener.2021.01.004
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发表时间：
2021-01-30
期刊：
影响因子：
6.7
通讯作者：
Cao, Derong
中科院分区：
文献类型：
--
作者：
Fu, Yajie;Li, Yang;Cao, Derong
合成了3种不同施主单元的螺环[9，9‘-xanthene](SFX)有机分子，并将其用作钙钛矿太阳能电池(PSCs)的无掺杂空穴传输材料。SFX核心上的末端基团分别是SFX-2DPA、SFX-2CZ和SFX-4CZ的两个甲氧基二苯胺取代二苯胺(MDDPA)、两个和四个甲氧基二苯胺取代咔唑(MDCZ)。系统地研究了不同施主单元对SFX基高温超导材料的光学、电化学和光物理性质的影响，并对其结构-功能关系进行了研究。基于SFX-2CZ的PSCs比基于SFX-2DPA的PSCs获得了15.83%的功率转换效率(PCE)(14.25%)，这是因为SFX-2CZ具有更高的分子平面度和更强的空穴传输能力以及HOMO能级的下移。而SFX-4CZ的成膜效率最低(12.19%)，这主要是因为其成膜能力较差。这些结果不仅为基于SFX核的无掺杂有机HTMS提供了新的分子设计，而且为综合考虑分子平面性和施主基团数目开发高效的HTMS提供了一种有前景的策略。
Three spiro[fluorene-9,9'-xanthene] (SFX)-based organic molecules with different donor units were synthesized and used as dopant-free hole-transport materials (HTMs) in perovskite solar cells (PSCs). The end-capping donor units on the SFX core are two methoxydiphenylamine-substituted diphenylamine (MDDPA), two and four methoxydiphenylamine-substituted carbazole (MDCZ) for SFX-2DPA, SFX-2CZ and SFX-4CZ, respectively. The structure-function relationship is systematically investigated as the impact of the different donor units upon the optical, electrochemical and photophysical properties of SFX-based HTMs. The PSCs based on SFX-2CZ attain the higher power conversion efficiency (PCE) of 15.83% than that based on SFX-2DPA (14.25%), due to higher molecular planarity of SFX-2CZ with enhanced hole transporting ability and the downshifted HOMO level. On other hands, SFX-4CZ has the lowest efficiency (12.19%) among three HTMs mainly due to its inferior film forming ability. The results provide not only the new molecular design of dopant-free organic HTMs based on SFX core, but also a promising strategy to develop efficient HTMs with both the molecular planarity and number of donor groups being considered.