1,8-Naphthalimide-Based Planar Small Molecular Acceptor for Organic Solar Cells
详细信息 查看全文
- 作者：Jicheng Zhang ; Xuejuan Zhang ; Hongmei Xiao ; Guangwu Li ; Yahui Liu ; Cuihong Li ; Hui Huang ; Xuebo Chen ; Zhishan Bo
- 刊名：ACS Applied Materials & Interfaces
- 出版年：2016
- 出版时间：March 2, 2016
- 年：2016
- 卷：8
- 期：8
- 页码：5475-5483
- 全文大小：560K
- ISSN：1944-8252
文摘
Four small molecular acceptors (SM1–4) comprising a central benzene core, two thiophene bridges and two 1,8-naphthalimide (NI) terminal groups were designed and synthesized by direct C–H activation. SM1 has a planar chemical structure and forms H-aggregation as films. By attachment of different substituents on the central benzene ring, the dihedral angles between the two NI end groups of SM1–4 gradually increased, leading to a gradual decrease of planarity. SM1–4 all possess a high-lying LUMO level, matching with wide band gap (WBG) polymer donors which usually have a high-lying LUMO level. When used in OSCs, devices based on SM1 and WBG donor PCDTBT-C12 gave higher electron mobility, superior film morphology and better photovoltaic performance. After optimization, a PCE of 2.78% with a Voc of 1.04 V was achieved for SM1 based devices, which is among the highest PCEs with a Voc higher than 1 V. Our results have demonstrated that NI based planar small molecules are potential acceptors for WBG polymer based OSCs.