Luizys Povilas, Xia Jianxing, Daskeviciene Maryte, Kantminiene Kristina, Kasparavicius Ernestas, Kanda Hiroyuki, Zhang Yi, Jankauskas Vygintas, Rakstys Kasparas, Getautis Vytautas, Nazeeruddin Mohammad Khaja
Department of Organic Chemistry, Kaunas University of Technology, Radvilenu pl. 19, Kaunas 50254, Lithuania.
Group for Molecular Engineering of Functional Material, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, CH-1951 Sion, Switzerland.
Chem Mater. 2021 Sep 14;33(17):7017-7027. doi: 10.1021/acs.chemmater.1c02114. Epub 2021 Aug 19.
A set of novel branched molecules bearing a different number of 3,6-bis(4,4'-dimethoxydiphenylamino)carbazole-based (Cz-OMeDPA) periphery arms linked together by aliphatic chains have been developed, and their performance has been tested in perovskite solar cells (PSCs). Electrical and photovoltaic properties have been evaluated with respect to the number of Cz-OMeDPA moieties and the nature of the linking aliphatic chain. The isolated compounds possess sufficient thermal stability and are amorphous having high glass-transition temperatures (>120 °C) minimizing the risk of direct layer crystallization. The highest hole-drift mobility of μ = 3.1 × 10 cm V s is comparable to that of the reference standard spiro-OMeTAD (4.1 × 10 cm V s) under identical conditions. Finally, PSCs employing two new HTMs ( and ) bearing two and three substituted carbazole chromophores, linked by an aliphatic chain, show a performance of around 20%, which is on par with devices using spiro-OMeTAD and demonstrates slightly enhanced device stability.
已经开发出一组新型支化分子，这些分子带有不同数量的基于3,6-双(4,4'-二甲氧基二苯胺基)咔唑（Cz-OMeDPA）的外围臂，通过脂肪族链连接在一起，并在钙钛矿太阳能电池（PSC）中测试了它们的性能。已针对Cz-OMeDPA部分的数量和连接脂肪族链的性质评估了电学和光伏性质。分离出的化合物具有足够的热稳定性，并且是非晶态的，具有高玻璃化转变温度（>120°C），将直接层结晶的风险降至最低。在相同条件下，最高空穴漂移迁移率μ = 3.1×10⁻³ cm² V⁻¹ s⁻¹与参考标准螺环-OMeTAD（4.1×10⁻³ cm² V⁻¹ s⁻¹）相当。最后，采用两种新型空穴传输材料（和）的PSC，这两种材料带有通过脂肪族链连接的两个和三个取代咔唑发色团，其性能约为20%，与使用螺环-OMeTAD的器件相当，并显示出略有增强的器件稳定性。
