摘要
Graphene dispersions in low-boiling-point green solvents have wide applications in coatings,conducting inks,batteries,electronics and solar cells.Two three-dimensional(3D)cathode interfacial materials(CIMs)(1,3,5,7,9,11,13,15-octa-(9-bis(30-(N,N-dimethylamino)propyl)-2,7-fluorene)-vinylpentacyclo-octasiloxane)(POSSFN)and(1,3,5,7-tetra-(9-bis(30-(N,N-dimethylamino)propyl)-2,7-fluorene)-adamantane)(ADMAFN)are excellent surfactants for dispersing graphene in ethanol at the concentration of 0.97–1.18 mg mL−1,in agreement with their calculated large adsorption energies on graphene.The results of electron spin resonance,Raman,scanning Kelvin probe microscopy and X-ray photoelectron spectroscopy measurements indicate that the amino groups could n-dope graphene or form dipole interaction with graphene.The two 3D-surfactant-based graphene composites(POSSFN-G and ADMAFN-G)can work as high-performance CIMs in organic solar cells(OSCs),which improve the power conversion efficiency(PCE)of the OSCs based on PM6:Y6 to 15.9%–16.1%.ADMAFN forms dipole interaction with graphene in ADMAFN-G and the composite CIM delivers high PCE of 16.11%in the OSCs,while POSSFN forms n-doped composition with graphene in POSSFN-G which works well as thicker CIM film in the OSCs.
低沸点绿色溶剂中分散石墨烯可广泛应用于涂料、导电油墨、电池、电子产品和太阳能电池等领域.研究发现,在乙醇溶液中,两种三维阴极界面材料POSSFN和ADMAFN分散石墨烯的浓度可达到0.97–1.18 mg mL^-1,通过计算得知这两种材料在石墨烯表面具有较大的吸附能.通过ESR、Raman、SKPM和XPS等测试手段证实,POSSFN侧链上的氨基能够与石墨烯发生n-掺杂作用;而AD-MAFN与石墨烯之间能够形成偶极相互作用.两种三维界面修饰-石墨烯复合材料(POSSFN-G和ADMAFN-G)均可作为阴极界面修饰材料应用于有机太阳能电池中,并使基于PM6:Y6光活性层的有机太阳能电池的能量转换效率(PCE)提高到了15.9%–16.1%,其中基于存在偶极相互作用的复合材料ADMAFN-G阴极修饰层的有机太阳能电池的PCE达到16.11%;使用存在n-掺杂作用的POSSFN-G阴极修饰层的器件,在厚膜状态下依然可获得较高的能量转换效率.
作者
Fei Pan
Song Bai
Xian Wei
Yingfen Li
Dianyong Tang
Xiwen Chen
Menglan Lv
Yongfang Li
潘飞;柏松;魏娴;黎应芬;唐典勇;陈希文;吕梦岚;李永舫(Guizhou Institute of Technology,Guiyang,550003,China;Beijing National Laboratory for Molecular Sciences,CAS Key Laboratory of Organic Solids,Institute of Chemistry,Chinese Academy of Sciences,Beijing,100190,China;Chongqing Engineering Laboratory of Targeted and Innovative Therapeutics,International Academy of Targeted Therapeutics and Innovation,Chongqing University of Arts and Sciences,Chongqing,402160,China;School of Chemical Science,University of Chinese Academy of Sciences,Beijing,100049,China;Guangzhou Polyforte Chemical Technology Co.LTD,Guangzhou,510520,China)
基金
the National Natural Science Foundation of China(51820105003,51863002 and 51973042)
the Excellent Young Scientific and Technological Talents of Guizhou,China(QKHPTRC[2019]5652)。
