Synthesis of SOT-OH and its application as a building block for the synthesis of new dimeric and trimeric Spiro-OMeTAD materials
Synthesis of SOT-OH and its application as a building block for the synthesis of new dimeric and trimeric Spiro-OMeTAD materials
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DOI：
10.1039/d2me00038e
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发表时间：
2022-04-28
影响因子：
3.6
通讯作者：
Cooke, Graeme
中科院分区：
文献类型：
--
作者：
Cariello, Michele;Pant, Namrata;Cooke, Graeme
Spiro-OMeTAD已成为钙钛矿型太阳能电池中普遍存在的空穴传输材料。然而，它有一些固有的缺点，包括它的长期稳定性、低电导率和空穴迁移率。因此，合成具有更好电荷传输性能的新型衍生物仍然是一个重要的目标。在这里，我们设计了一种新的合成路线来制备不对称官能化的螺环-OMeTAD衍生物。我们报道了一种单脱甲基螺环-OMeTAD衍生物SOT-OH的合成，使用了两种不同的合成方案，并展示了两个新的衍生物，一个是二聚体(SOT-D)，一个是三聚体(SOT-T)。我们对所开发的材料进行了充分的表征，当掺杂相同浓度的标准离子盐时，显示出比Spiro-OMeTAD高得多的电导值。使用混合成分Cs-0.05(FA(0.85)MA(0.15))(0.95)PbI3和新型SOT-D制作的太阳能电池在标准AM1.5照明下的功率转换效率高达16.4%，而使用基准Spiro-OMeTAD时的功率转换效率为16.1%。
Spiro-OMeTAD has become a ubiquitous hole-transporting material (HTM) in perovskite-based solar cells. However, it has several intrinsic drawbacks including its long-term stability, low conductivity and hole-mobility. Hence, the synthesis of new derivatives with improved charge transporting properties remains an important goal. Here, we have devised a novel synthetic route to prepare unsymmetrically functionalised Spiro-OMeTAD derivatives. We report the synthesis of a mono-demethylated Spiro-OMeTAD derivative, SOT-OH, utilising two different synthetic protocols and show two new derivatives, a dimer (SOT-D) and a trimer (SOT-T) as exemplars. We fully characterise the developed materials and show significantly higher conductivity values than Spiro-OMeTAD when doped with standard ionic salts at the same concentrations. The solar cells fabricated using the mixed composition Cs-0.05(FA(0.85)MA(0.15))(0.95)PbI3 perovskite and the novel SOT-D show power conversion efficiencies of up to 16.4% under standard AM1.5 illumination compared to 16.1% observed when using the benchmark Spiro-OMeTAD.