Organic Dyes Containing Pyrenylamine-Based Cascade Donor Systems with Different Aromatic π Linkers for Dye-Sensitized Solar Cells: Optical, Electrochemical, and Device Characteristics
作者:K. R. Justin Thomas、Neha Kapoor、Chuan-Pei Lee、Kuo-Chuan Ho
DOI:10.1002/asia.201100849
日期:2012.4
New organic dyes containing pyrenylamine donors in a cascade arrangement and cyanoacrylic acid acceptors have been synthesized and characterized by optical, electrochemical, and theoretical studies. The dyes inherit a D‐π1‐D‐π2‐A (D=donor, A=acceptor) molecular architecture where the π linkers π1 are changed from phenyl to biphenyl and fluorene, whereas the π linker π2 that connects the donor fragment
已经合成并通过光学,电化学和理论研究表征了新型有机染料,这些有机染料含有级联排列的苯胺基供体和氰基丙烯酸受体。染料继承一个d -π 1 - d -π 2 -A(d =供体,A =受体)的分子结构,其中π接头π 1选自苯基变更为联苯基和芴,而π接头π 2将供体片段与受体连接的是苯基单元。已经发现连接两个供体链段的共轭途径在光学和电化学性质中起主要作用。较短的π接头(例如苯基)可促进供体与受体的相互作用,而非平面联苯间隔基可减少供体之间的电子连通,并增强相应染料的氧化倾向。所有的染料都显示出强烈的更长波长的电子跃迁,这归因于胺到氰基丙烯酸的电荷转移。该峰的消光系数随着两个供体链段之间共轭路径长度的增加而急剧增加。染料用作纳米晶TiO 2中的敏化剂基于染料的敏化太阳能电池(DSSC)和级联供体系统具有良好的吸收和氧化还原特性,有助于提高设备效率。