Diacetylene bridged triphenylamines as hole transport materials for solid state dye sensitized solar cells
作者:Miquel Planells、Antonio Abate、Derek J. Hollman、Samuel D. Stranks、Vishal Bharti、Jitender Gaur、Dibyajyoti Mohanty、Suresh Chand、Henry J. Snaith、Neil Robertson
DOI:10.1039/c3ta11417a
日期:——
We have synthesized and characterized a series of triphenylamine-based hole-transport materials (HTMs), and studied their function in solid-state dye sensitized solar cells (ss-DSSCs). By increasing the electron-donating strength of functional groups (–H < –Me < –SMe < –OMe) we have systematically shifted the oxidation potential and ensuing photocurrent generation and open-circuit voltage of the solar cells. Correlating the electronic properties of the HTM to the device operation highlights a significant energy offset required between the Dye – HTM highest occupied molecular orbital (HOMO) energy levels. From this study, it is apparent that precise control and tuning of the oxidation potential is a necessity, and usually not achieved with most HTMs developed to date for ss-DSSCs. To significantly increase the efficiency of solid-state DSSCs understanding these properties, and implementing dye-HTM combinations to minimize the required HOMO offset is of central importance.
我们合成并表征了一系列基于三苯胺的孔导体材料(HTMs),并研究了它们在固态染料敏化太阳能电池(ss-DSSCs)中的功能。通过增强功能团的电子给予能力(–H < –Me < –SMe < –OMe),我们系统性地改变了氧化电位以及太阳能电池的光电流生成和开路电压。将HTM的电子特性与器件操作相关联,凸显了染料-HTM最高占有分子轨道(HOMO)能级之间需要显著的能量偏移。从这项研究中显而易见,精确控制和调节氧化电位是必要的,这在目前为止开发的多数HTMs中通常未能实现。为了显著提高固态DSSCs的效率,理解这些特性并实施染料-HTM组合以最小化所需的HOMO偏移至关重要。