Furan Conjugated Polymers Useful for Photovoltaic Applications
申请人:Beaujuge Pierre M.
公开号:US20120085992A1
公开(公告)日:2012-04-12
The present invention provides for a polymer comprising a π-conjugated backbone comprising a furan. The polymer has a narrow or low band gap and/or is solution processable. In some embodiments, the polymer is PDPP2FT or PDPP3F. The present invention also provides for a device comprising the polymer, such as a light-emitting diode, thin-film transistor, chemical biosensor, non-emissive electrochromic, memory device, photovoltaic cells, or the like.
Side-Chain Tunability of Furan-Containing Low-Band-Gap Polymers Provides Control of Structural Order in Efficient Solar Cells
作者:Alan T. Yiu、Pierre M. Beaujuge、Olivia P. Lee、Claire H. Woo、Michael F. Toney、Jean M. J. Fréchet
DOI:10.1021/ja2089662
日期:2012.2.1
The solution-processability of conjugated polymers in organic solvents has classically been achieved by modulating the size and branching of alkyl substituents appended to the backbone. However, these substituents impact structural order and charge transport properties in thin-film devices. As a result, a trade-off must be found between material solubility and insulating alkyl content. It was recently shown that the substitution of furan for thiophene in the backbone of the polymer PDPP2FT significantly improves polymer solubility, allowing for the use of shorter branched side chains while maintaining high device efficiency. In this report, we use PDPP2FT to demonstrate that linear alkyl side chains can be used to promote thin-film nanostructural order. In particular, linear side chains are shown to shorten pi-pi stacking distances between backbones and increase the correlation lengths of both pi-pi stacking and lamellar spacing, leading to a substantial increase in the efficiency of bulk heterojunction solar cells.
Synthesis, linear and nonlinear optical properties of thermally stable ferrocene-diketopyrrolopyrrole dyads
Thermally stable ferrocene-DPP dyads exhibit non-zero dipole moments as well as negative solvatochromism and show structure dependent second-order nonlinear polarizabilities.