Photoinduced electron transfer in multilayer self-assembled structures of porphyrins and porphyrin–fullerene dyads on ITO
Photoinduced electron transfer in multilayer self-assembled structures of porphyrins and porphyrin–fullerene dyads on ITO
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DOI：
10.1039/b508941g
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发表时间：
2005-10
影响因子：
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通讯作者：
Marja Isosomppi;N. Tkachenko;A. Efimov;K. Kaunisto;Kohei Hosomizu;H. Imahori;H. Lemmetyinen
中科院分区：
文献类型：
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作者：
Marja Isosomppi;N. Tkachenko;A. Efimov;K. Kaunisto;Kohei Hosomizu;H. Imahori;H. Lemmetyinen
一种用于构建光活性供体-受体系统的有序、自组装多层结构的新策略已经被开发出来。在这种方法中，用锌卟啉（ZnP）和游离碱卟啉-富勒烯（H2P-C60）二元体的连续自组装单层对氧化铟锡（ITO）电极进行修饰，以获得定向三元组构型。所有层都连接有两个分子连接体，以实现有组织的组合。研究发现，与相同化合物的单层结构相比，多层结构可以增强光电流和光电压的产生。特别是，将致密的 ZnP 层与高度取向的 H2P-C60 双层相结合，产生的光电压响应比单层双层测量的光电压响应高 280 倍。此外，光电压和光电流都是在样品方向所追求的所需方向上产生的，并且由于组织的原因，形成了几乎理想的电流-电压曲线。
A new strategy for constructing well-ordered, self-assembled multilayer structures of photoactive donor–acceptor systems has been developed. In this approach indium–tin oxide (ITO) electrodes were modified with successive self-assembled monolayers of Zn porphyrins (ZnP) and free-base porphyrin–fullerene (H2P–C60) dyads to obtain oriented triad configurations. All the layers were attached with two molecular linkers to achieve an organized composition. The multilayer structures were found to enhance the photocurrent and photovoltage generation compared to monolayers of the same compounds. Particularly, combining a densely packed ZnP layer with the highly oriented H2P–C60 dyad layer resulted in 280 times higher photovoltage response than measured for a monolayer of the dyad. Furthermore, both photovoltage and photocurrent were generated in the desired direction pursued with the sample orientations and, as a result of the organization, almost ideal current–voltage curves were formed.