Efficient triarylamine-perylene dye-sensitized solar cells: influence of triple-bond insertion on charge recombination.
Efficient triarylamine-perylene dye-sensitized solar cells: influence of triple-bond insertion on charge recombination.
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DOI：
10.1021/am507261j
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发表时间：
2015-01
影响因子：
9.5
通讯作者：
Cancan Yan;Wentao Ma;Yameng Ren;Min Zhang;Peng Wang
中科院分区：
文献类型：
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作者：
Cancan Yan;Wentao Ma;Yameng Ren;Min Zhang;Peng Wang
我们合成了两个新的无金属的给体-受体有机染料（C266和C267），其特征在于一个N-环状的苝嵌段。由于共轭单元的共面性的改善以及在三芳胺和二萘嵌苯片段之间插入三键后的共轭延长，C267染料相对于其参比染料C266表现出轻微红移的吸收峰和增强的最大摩尔吸收系数，从而导致染料敏化太阳能电池中光电流输出的改善。然而，三键的引入也带来了超过100 mV的减少开路光电压由于更快的界面电荷复合，这与减少的平均厚度的自组装染料层上的二氧化钛的X射线反射率测量所揭示的一个明确的相关性。C266染料，虽然具有相对较弱的捕光能力，但在100 mW cm（-2），模拟AM 1.5G太阳光下显示出9.0%的较高的功率转换效率。
We synthesize two new metal-free donor-acceptor organic dyes (C266 and C267) featuring a N-annulated perylene block. Owing to the improved coplanarity of conjugated units as well as the prolonged conjugation upon inserting a triple bond between the triarylamine and perylene segments, the C267 dye exhibits a slightly red-shifted absorption peak and an enhanced maximum molar absorption coefficient with respect to its reference dye C266, leading to an improved photocurrent output in dye-sensitized solar cells. However, the triple-bond introduction also brings forth an over 100 mV reduced open-circuit photovoltage owing to faster interfacial charge recombination, which presents a clear correlation with a reduced mean thickness of self-assembled dye layer on titania as revealed by X-ray reflectivity measurements. The C266 dye, albeit with a relatively weaker light-harvesting capacity, displays a higher power conversion efficiency of 9.0% under the 100 mW cm(-2), simulated AM1.5G sunlight.