Triphenylamine/Tetracyanobutadiene‐Based π‐Conjugated Push–Pull Molecules End‐Capped with Arene Platforms: Synthesis, Photophysics, and Photovoltaic Response
作者:Pablo Simón Marqués、José María Andrés Castán、Benedito A. L. Raul、Giacomo Londi、Ivan Ramirez、Maxim S. Pshenichnikov、David Beljonne、Karsten Walzer、Martin Blais、Magali Allain、Clément Cabanetos、Philippe Blanchard
DOI:10.1002/chem.202002810
日期:2020.12.9
π‐Conjugated push–pull molecules based on triphenylamine and 1,1,4,4‐tetracyanobuta‐1,3‐diene (TCBD) have been functionalized with different terminal arene units. In solution, these highly TCBD‐twisted systems showed a strong internal charge transfer band in the visible spectrum and no detectable photoluminescence (PL). Photophysical and theoretical investigations revealed very short singlet excited
基于三苯胺和1,1,4,4-四氰基布多-1,3-二烯(TCBD)的π共轭推挽分子已通过不同的芳烃末端官能化。在解决方案中,这些高度TCBD扭曲的系统在可见光谱中显示出很强的内部电荷转移带,并且没有可检测到的光致发光(PL)。光物理和理论研究表明,由于光激发后TCBD-芳烃部分的显着构象变化,导致非常短的单峰激发态失活时间约为10 ps,这为非辐射衰变开辟了途径。PL是在真空处理过的薄膜中回收的,或者当分子分散在PMMA基质中时,导致激发态失活时间大大增加。如循环伏安法所示,与C相比,这些分子可以充当电子供体60。因此,制造了真空处理的平面异质结有机太阳能电池,导致最大功率转换效率约为。1.9%,随着芳烃尺寸的增加而降低。