聚合物FBT-Th 4(1,4)的吸收光谱(M n = 46.4 Kg / mol,E g = 1.62 eV,HOMO = –5.36 eV)显示出很强的链间聚集能力。在温和条件下制造的OFET中证明了高达1.92 cm 2(V s)–1的高空穴迁移率。有源层厚度在100到440 nm之间的倒置太阳能电池显示PCE超过6.5%,而230 nm厚的有源层可实现7.64%的最高效率。
Molecular-level architectural design using benzothiadiazole-based polymers for photovoltaic applications
作者:Vinila N Viswanathan、Arun D Rao、Upendra K Pandey、Arul Varman Kesavan、Praveen C Ramamurthy
DOI:10.3762/bjoc.13.87
日期:——
conjugated polymers, P1 (PFDTBT), P2 (PFDTDFBT) and P3 (PFDTTBT), based on fluorene and benzothiadiazole, was synthesized. The effect of fluorine substitution and fused aromatic spacers on the optoelectronic and photovoltaic performance was studied. The polymer, derived from dithienylated benzothiodiazole and fluorene, P1, exhibited a highest occupied molecular orbital (HOMO) energylevel at -5.48 eV
Quinoxaline–thiophene based thick photovoltaic devices with an efficiency of ∼8%
作者:Yuxiang Li、Seo-Jin Ko、Song Yi Park、Hyosung Choi、Thanh Luan Nguyen、Mohammad Afsar Uddin、Taehyo Kim、Sungu Hwang、Jin Young Kim、Han Young Woo
DOI:10.1039/c6ta03801h
日期:——
Three types of quinoxaline–thiophene based photovoltaic polymers were synthesized by considering the backbone coplanarityviaside-chain spacing and intrachain non-covalent coulombic interactions.
New donor–acceptorconjugatedcopolymers based on alkylthienylbenzodithiophene (BDTT) and alkoxynaphthodithiophene (NDT) have been synthesized and compared with their benzo[1,2‐b:4,5‐b′]dithiophene (BDT)‐based analogues to investigate the effect of the extended π conjugation of the polymer main chain on the physicochemical properties of the polymers. A systematic investigation into the optical properties
合成了基于烷基噻吩苯并二噻吩(BDTT)和烷氧基萘二噻吩(NDT)的新型供体-受体共轭共聚物,并将其与苯并[1,2- b:4,5- b基于']二噻吩(BDT)的类似物,以研究聚合物主链扩展π共轭对聚合物物理化学性质的影响。对这些聚合物的光学性质,能级,场效应晶体管特性和光伏特性进行了系统研究。与基于BDT的类似物相比,两种聚合物均表现出增强的光伏性能和更高的空穴迁移率。但是,基于BDTT的聚合物(π的共轭扩展垂直于主链)对于单结聚合物太阳能电池的功率转换效率最高,为5.07%,而基于NDT的聚合物(沿πTT的共轭扩展沿太阳能电池的功率转换效率最高)。主链)达到约0.1 cm 2 V的最高空穴迁移率-1 s -1基于场效应晶体管;这表明在不同方向上扩展π共轭将对所得聚合物的性能产生重大影响。
D-A copolymers based on 5,6-difluorobenzotriazole and oligothiophenes: Synthesis, field effect transistors, and polymer solar cells
mobility for PFBTA-4T is the highest among the reported FBTA-based polymers, suggesting that FBTA is a promising heterocycle to construct polymers with high mobility. Polymersolarcells were also fabricated with PFBTA-3T and PFBTA-4T as the donor and PC61BM as the acceptor. With copolymer: PC61BM = 1:1.5 as the active layers, polymersolarcells showed power conversion efficiencies of 3.0% and 2.51% for PFBTA-3T
成功合成了两种新的5,6-二氟苯并三唑(FBTA)-低聚噻吩共聚物PFBTA-3T和PFBTA-4T,分别在主链上包含三噻吩(3T)和四噻吩(4T)。建立了合成FBTA单体的新途径。聚合物PFBTA-3T和PFBTA-4T在普通有机溶剂中显示出良好的溶解性和良好的热稳定性。与聚(3-己基噻吩)相比,在PFBTA-3T和PFBTA-4T中掺入FBTA可能导致两种共聚物的带隙较小,约为1.83 eV。PFBTA-3T和PFBTA-4T的HOMO水平分别为-5.49和-5.31 eV,而它们的LUMO水平分别为-3.65和-3.90 eV。在未经高温热退火的场效应晶体管中,PFBTA-3T和PFBTA-4T的空穴迁移率可达到1.68×10-3和1.31×10 -2 cm 2 V -1 s -1。PFBTA-4T的迁移率是已报道的基于FBTA的聚合物中最高的,这表明FBTA是构建高迁移率聚合
The role of conjugated side chains in high performance photovoltaic polymers
Four new D–A type copolymers, namely, PBDT-DFQX-PP, PBDT-DFQX-TP, PBDT-DFQX-PT and PBDT-DFQX-TT, were designed and synthesized to investigate the influence of conjugated side chain pattern on photovoltaic properties of conjugated polymers. All the four copolymers have an identical conjugated backbone comprising benzo[1,2-b:4,5-b′]dithiophene (BDT) donor unit and quinoxaline (Qx) acceptor unit, but
设计并合成了四种新型D–A型共聚物,即PBDT-DFQX-PP,PBDT-DFQX-TP,PBDT-DFQX-PT和PBDT-DFQX-TT,以研究共轭侧链图案对光伏性能的影响。共轭聚合物。所有四种共聚物均具有相同的共轭主链,该主链包含苯并[1,2- b:4,5- b ']二噻吩(BDT)供体单元和喹喔啉(Qx)受体单元,但共轭侧链p有所不同-烷氧基苯基或2-烷基噻吩基,分别与供体和受体单元相连。紫外/可见吸收光谱,电化学循环伏安法,密度泛函理论(DFT),掠入射X射线散射(GIXS),透射电子显微镜(TEM)和光伏测量结果证明,共轭侧链调制的差异导致完全不同的理化特性。在四种共聚物中,与PC 71 BM共混时,PBDT-DFQX-TT表现出最宽的吸收光谱,最紧密堆积的结构以及最细的原纤维结构。经过系统的设备优化后,基于PBDT-DFQX-PP,PBDT-DFQX-TP,PBDT-DFQX