A(1)-A-A(1) type small molecules terminated with naphthalimide building blocks for efficient non-fullerene organic solar cells

作者：Dang, Dongfeng^*; Zhi, Ying; Wang, Xiaochi; Zhao, Baofeng^*; Gao, Chao^*; Meng, Lingjie^*

来源：Dyes and Pigments, 2017, 137: 43-49.

DOI：10.1016/j.dyepig.2016.09.059

• Organic solar cells
• Non-fullerene acceptors
• Naphthalimide
• High open-circuit voltage values

Novel non-fullerene acceptors with an A(1)-A-A(1) framework were designed and synthesized, in which benzothiadiazole and diketopyrrolopyrrole building blocks were employed as the A unit and naphthalimide units were incorporated as the A(1) units. Both acceptor systems exhibited a broadened absorption spectra from 300 nm to 700 nm in contrast to that of fullerene derivatives. Meanwhile, high lying LUMO energy levels were also observed for both developed acceptors. To investigate photovoltaic properties of the acceptors, bulk-heterojunction organic solar cells were fabricated using an established electron donating polymer as the donor material. As anticipated, efficient non-fullerene OSCs with high Voc values up to 1.01-1.12 V were achieved when the new molecules were employed as electron acceptors, leading to the PCE values of 1.23% and 1.64% in their solar cells. Our results here demonstrate that the A(1)-A-A(1) type small molecule containing naphthalimide building blocks in molecular backbone could be the promising electron acceptor in organic solar cells.

• 出版日期2017-2
• 单位西安交通大学; 西安近代化学研究所