Four novel DâÏâAâÏâD-type small molecules (SMs) were synthesized and their Ï-linkage effects were investigated. Among them, SM2 with vinylene as the Ï-linkage exhibited better molecular coplanarity, reaching a relatively higher power conversion efficiency (PCE) of 3.76%. SM3 and SM4 with acetylene and acrylonitrile as Ï-linkages exhibited relatively higher open-circuit voltages (VOC) of 0.93 V and 0.90 V, respectively, owing to their deep-lying HOMO levels. These results gave an important guide for developing new materials in solution-processed small molecule solar cells.
研究人员合成了四种新型 DâÏâAâÏâD 型小分子(SMs),并研究了它们的Ï-连接效应。其中,以
乙烯为Ï-连接键的
SM2 表现出更好的分子共面性,功率转换效率(
PCE)相对较高,达到 3.76%。以
乙炔和
丙烯腈为Ï-连接的 SM3 和 S
M4 由于具有深层 HO
MO 水平,开路电压(VOC)相对较高,分别为 0.93 V 和 0.90 V。这些结果为开发溶液法小分子太阳能电池新材料提供了重要指导。