Synthesis of an A-D-A type of molecule used as electron acceptor for improving charge transfer in organic solar cells
作者:Chao-Zhi Zhang、Shu-Duo Gu、Dan Shen、Yang Yuan、Mingdao Zhang
DOI:10.1016/j.chemphys.2016.06.019
日期:2016.8
Electron-accepting molecules play an important role in developing organic solar cells. A new type of A-D-A molecule, 3,6-di([7-(5-bromothiophen-2-yl)-1,5,2,4,6,8-dithiotetrazocin-3-yl]thiophen-2-yl)-9-(2-ethylhexyl)carbazole, was synthesized. The lowest unoccupied molecular orbital (LUMO) and highest occupied molecular orbital (HOMO) energy levels are −3.55 and −5.85 eV, respectively. Therefore, the A-D-A type of
摘要 受电子分子在有机太阳能电池的发展中发挥着重要作用。一种新型的ADA分子,3,6-di([7-(5-bromothiophen-2-yl)-1,5,2,4,6,8-dithiotetrazocin-3-yl]thiophen-2-yl)合成了-9-(2-乙基己基)咔唑。最低未占分子轨道(LUMO)和最高占据分子轨道(HOMO)能级分别为-3.55和-5.85 eV。因此,ADA类化合物可作为电子受体用于制造具有高开路电压的有机太阳能电池。Gibbs 自由能 (-49.2 kJ/mol) 表明 ADA 受体在激发态接受来自聚 (3-己基噻吩) 的电子的过程是自发的。电子从 P3HT 转移到有机界面处的 ADA 受体过程中的熵值 (118 J/mol) 表明,在供体/受体界面处电子-空穴对分离产生的电子将被有效地离域。因此,ADA分子将成为高效有机BHJ太阳能电池的潜在受体。