影像科学与光化学2017，Vol.35Issue(5)：736-748,13.DOI:10.7517/j.issn.1674-0475.2017.04.034
萘酰亚胺取代修饰4,4'-螺双环戊并[2,1-b:3,4-b']二噻吩化合物的合成制备及其在有机薄膜光伏器件中的应用研究
Synthesis and Properties of 4,4'-Spiro-bi[cyclopenta[2,1-b;3,4-b']dithiophene] Cored 1,8-Naphthalimide Derivatives for Organic Solar Cells
张佳斌 1马玉超 2伊金垛 2窦军彦 2王洪宇 2马昌期1
作者信息
- 1. 上海大学理学院化学系,上海200444
- 2. 中国科学院苏州纳米技术与纳米仿生研究所印刷电子研究中心,江苏苏州215123
- 折叠
摘要
Abstract
With the rapid development of high performance non-fullerene electron acceptor,the power conversion efficiency of polymer solar cells increased dramatically in the last few years,among which structurally non-planar electron acceptors play a very important role.In this paper,a new family non-fullerene electron acceptor based on 1,8-naphthalimide unit with cyclopenta [2,1-b;3,4-b'] dithiophene (CPDT-(NMI) 2),4,4'-spiro-bi [cyclopenta[2,1-b;3,4-b'] dithiophene] (SCPDT-(NMI)4) or 4-H-cyclopenta-[2,l-b;3,4-b'] dithiophene-4-one (CPDT-O-(NMI)2) core were synthesized.The absorption and fluorescence spectra,as well as the electrochemical properties of these compounds were characterized.Results showed that SCPDT-(NMI)4 showed a blue-shifted absorption compared to that of CPDT-(NMI)2,which is ascribed to the twisted molecular structure of CPDT-(NMI)2 for its high steric hindrance.While CPDT-O-(NMI)2 showed two absorption bands with peaking wavelength at 420 nm and 550 nm,which is quite different to that of SCPDT-(NMI)4 and CPDT-(NMI)2.Solid state absorption spectra confirm that SCPDT-(NMI)4 and CPDT-(NMI)2 showed low intermolecular interaction,which could be attributed to the non-planar molecular structure of these two compounds as well.Fluorescence of the SCPDT-(NMI)4 film was found to be red-shifted 11 nm over CPDT-(NMI)2,which is ascribed to the spiro-conjugation effect of SCPDT-(NMI)4 in excited state.Cyclic voltammetry results demonstrated that LUMO energy levels of these compounds are around-3.5 to-3.8 eV,making them suitable electron acceptor in polymer solar cells.Polymer solar cell using PBDB-T as the electron donor and SCPDT-(NMI)4 as the electron acceptor showed a high power conversion efficiency of 1.16 ％,which is much higher than that of CPDT-(NMI)2 (0.11％).Fluorescence of the blended films confirmed that photon induced electron transfer between PBDB-T and NMIs is not completed,which is believed to be one of the main reason for the low device performance.关键词
有机太阳能电池/非富勒烯受体材料/光敏材料/螺共轭效应Key words
organic solar cells/non-fullerene electron acceptor/photosensitive materials/spiro conjugation引用本文复制引用
张佳斌,马玉超,伊金垛,窦军彦,王洪宇,马昌期..萘酰亚胺取代修饰4,4'-螺双环戊并[2,1-b:3,4-b']二噻吩化合物的合成制备及其在有机薄膜光伏器件中的应用研究[J].影像科学与光化学,2017,35(5):736-748,13.
