许多先前的研究表明,包括分子骨架和烷基链在内的低聚噻吩衍生物的分子结构对其在表面的自组装具有显着影响。在这项工作中,采用了一系列用末端二氰基乙烯基和烷基链修饰的线性低聚噻吩衍生物(DCV- n T-Hex,n = 3∼11),通过扫描隧道显微镜进一步研究了液-固界面的不同组装行为( ST)。有趣的是,通过氢键和范德瓦尔斯相互作用,DCV-3T-Hex 形成锯齿形和花状结构,而 DCV- n T-Hex ( n = 4∼11)形成层状结构。密度泛函理论 (DFT) 计算表明,对于 DCV- n T-Hex 的最有利配置,烷基链的不同分布影响分子间相互作用,并最终导致不同的组装结构。与 DCV- n T-Hex 的其他结构 ( n = 4∼11)相比,DCV-3T-Hex 的锯齿形和花形结构具有优先的热力学稳定性。此外,偶数 ( n = 4, 6, 8, 10) 的 DCV- n T-Hex
Isomeric dicyanovinylene-terminated oligothiophenes 1 and 2 comprising a central dithienopyrrole (DTP) unit have been developed for solution-processed small molecule organic solar cells (SMOSCs) giving the highest power conversion efficiency of 4.8% for DTP-based oligomeric materials.
A novelcovalentlylinked donor–acceptor dyad comprising a dithienopyrrol-based oligomeric donor and a fullerene acceptor was synthesized and characterized. The concomitant effect of favorable optoelectronic properties, energy levels of the frontier orbitals, and ambipolar charge transport enabled the application of the dyad in simplified solution-processed single material organic solarcells reaching
Organic material and photoelectric conversion element
申请人:Arai Ryota
公开号:US10062854B2
公开(公告)日:2018-08-28
To provide an organic material represented by General Formula (1) below:
where, in General Formula (1), R1 and R2 are each independently an alkyl group having from 2 through 8 carbon atoms, R3 and R4 are each independently a straight-chain alkyl group having 1, 2, 4, 6, or 12 carbon atoms, or a hydrogen atom, and n is an integer of 1 or 2.
Strategic end-halogenation of π-conjugated small molecules enabling fine morphological control and enhanced performance of organic solar cells
作者:Seiichi Furukawa、Takuma Yasuda
DOI:10.1039/c9ta03869h
日期:——
Organicsolarcellsbased on π-conjugatedsmallmolecules (SM-OSCs) have developed rapidly in the past few years. Nevertheless, the design strategies of small-molecule (SM) donors for high-efficiency SM-OSCs require further improvement. Halogenation is an effective way to modulate their electronic properties, and to date, fluorination has been most widely used for the design of organic photovoltaic
Metallated conjugation in small-sized-molecular donors for solution-processed organic solar cells
作者:Chaohua Cui、Yunye Zhang、Wallace C. H. Choy、Hua Li、Wai-Yeung Wong
DOI:10.1007/s11426-014-5301-x
日期:2015.2
Four metallated conjugated oligothiophenes, S-1, S-2, S-3 and S-4, with platinum(II) aryleneethynylenes as the electron-rich building block were synthesized to investigate their physicochemical and photovoltaic properties. These small molecules possess fairly low-lying HOMO energy levels which match with the LUMO energy level of the electron acceptor PC70BM ([6,6]-phenyl-C71-butyric acid methyl ester). Using the simple process of spin-coating solution fabrication technique, S-1:PC70BM (1:4, w/w) based organic solar cells exhibiting a high V oc of 0.913 V, with a PCE value of 0.88% were developed. In contrast, the OSC device based on S-2:PC70BM (3:7, w/w) displayed a higher PCE of 1.59% with a higher J sc value of 5.89 mA cm−2. The device based on S-4:PC70BM (1:4, w/w) exhibited a PCE value of 1.56%, with a V oc of 0.917 V.