A solution-processed nanoscale COF-like material towards optoelectronic applications

• 作者: Qiang Fu Ting Wang Yanna Sun Nan Zheng Zengqi Xie Di Lu Zhiyuan Xu Xiangjian Wan Yamin Zhang Yongsheng Liu
• 来源期刊: 中国科学：化学（英文版）
• 年，卷（期）: 2021,（1）
• 所属期刊栏目: ARTICLES
• 页码范围: 82-91
• 页数: 10页
• 语种: 英文

摘要

Two-dimensional(2D)covalent organic frameworks(COFs)with periodic functional π-electron systems are an emerging class of optoelectronic materials.However,almost all conjugated COFs so far are insoluble and hard to process,which hampers severely their optoelectronic applications.Here,a solution-processable,nanoscale and sp2 carbon-conjugated COF-like material,PDPP-C20 was successfully designed and synthesized.The solution-processed PDPP-C20 films exhibit high crystallinity and excellent charge transport properties along out-of-plane directions,combined with the highest occupied molecular orbital(HOMO)/lowest unoccupied molecular orbital(LUMO)levels of-5.36/-3.75 eV,making PDPP-C20 suitable for electronic device applications.An efficiency as high as 21.92％has been demonstrated when it was used as a functional interfacial layer in perovskite solar cells,coupled with dramatically improved stability in comparison with the control device due to the superior hydrophobicity of PDPP-C20 layer as well as its passivation effect on perovskite surface.Furthermore,the soluble PDPP-C20 could also be used as donor in bulk-heterojunction organic solar cells and an initial efficiency of 2.46％has been achieved.These results indicate that this new class of soluble and nanoscale COF-like materials should offer a new arena of functional materials for optoelectronic devices.