Optimizing the Energy Offset between Dye and Hole-Transporting Material in Solid-State Dye-Sensitized Solar Cells
Optimizing the Energy Offset between Dye and Hole-Transporting Material in Solid-State Dye-Sensitized Solar Cells
复制标题
优化固态染料敏化太阳能电池中染料和空穴传输材料之间的能量抵消
DOI：
10.1021/jp405734f
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
Weisspfennig C
中科院分区：
文献类型：
--
作者：
Weisspfennig C
固态染料敏化太阳能电池的功率转换效率可以通过减小染料和空穴传输材料（HTM）的最高占据分子轨道（HOMO）能级之间的能量偏移以最小化电势损失来优化。在这里，我们报告了三种新的HTM的HOMO水平略高于和低于常用的HTM 2，2 ′，7，7 ′-四（N，N-二-对甲氧基苯胺基）-9，9 ′-螺二芴（spiro-OMeethane）的HOMO水平的研究，以系统地探索这种可能性。使用瞬态吸收光谱和采用钌基染料Z907作为敏化剂，它表明，尽管一个新的HTM显示出100%的空穴转移产率，所有的设备的基础上的新HTM表现不如那些纳入螺-OMeCl 2。我们进一步证明，HTM的设计有一个额外的影响，在TiO 2电极表面的电子态密度，因此不仅影响空穴，但也从敏化剂的电子转移。这些结果提供了洞察HTM对电荷转移的复杂影响，并为新材料的分子设计提供指导。
The power-conversion efficiency of solid-state dye-sensitized solar cells can be optimized by reducing the energy offset between the highest occupied molecular orbital (HOMO) levels of dye and hole-transporting material (HTM) to minimize the loss-in-potential. Here, we report a study of three novel HTMs with HOMO levels slightly above and below the one of the commonly used HTM 2,2′,7,7′- tetrakis(N,N-di-p-methoxyphenylamino)-9,9′-spirobifluorene (spiro-OMeTAD) to systematically explore this possibility. Using transient absorption spectroscopy and employing the ruthenium based dye Z907 as sensitizer, it is shown that, despite one new HTM showing a 100% hole-transfer yield, all devices based on the new HTMs performed worse than those incorporating spiro-OMeTAD. We further demonstrate that the design of the HTM has an additional impact on the electronic density of states present at the TiO2electrode surface and hence influences not only hole- but also electron-transfer from the sensitizer. These results provide insight into the complex influence of the HTM on charge transfer and provide guidance for the molecular design of new materials.
影响因子：
56.9
作者：
Yella, Aswani;Lee, Hsuan-Wei;Graetzel, Michael
通讯作者：
Graetzel, Michael
影响因子：
15
作者：
NAZEERUDDIN, MK;KAY, A;GRATZEL, M
通讯作者：
GRATZEL, M