Towards chemically bonded p–n heterojunctions through surface initiated electrodeposition of p-type conducting polymer inside TiO2 nanotubes
作者:Daoai Wang、Qian Ye、Bo Yu、Feng Zhou
DOI:10.1039/c0jm00743a
日期:——
Improving the interfacial adhesion is the key to improve and to guarantee stable performance of organicâinorganic solar cells. In this paper, we demonstrate a proof-of-concept approach by using a biomimetic initiator to initiate on-site electrochemical polymerization of pyrrole inside TiO2 nanotubes so as to improve the adhesion during formation of coaxial pân nanohybrids. The new bifunctional anchor of N-(3,4-dihydroxyphenethyl)-pyrrole-2-carboxamide (Dop-Py) is inspired by mussel adhesive proteins and can strongly anchor to TiO2, and so provides a grafted monomer for initiation of electropolymerization. Much quicker polymerization rate and larger density of polypyrrole (PPy) are achieved than that without the biomimetic initiator. In addition, interface adhesion between PPy and TiO2 is dramatically enhanced, and so the improved charge transfer efficiency as indicated by impedance characterization, suggesting that this is a promising strategy for fabricating ordered organic/inorganic pân heterojunctions.
提高界面附着力是提高和保证有机-无机太阳能电池性能稳定的关键。在本文中,我们展示了一种概念验证方法,即使用仿生引发剂引发 TiO2 纳米管内吡咯的现场电化学聚合,从而提高同轴 p-n 纳米杂化物形成过程中的粘附力。 N-(3,4-二羟基苯乙基)-吡咯-2-甲酰胺 (Dop-Py) 的新型双功能锚受到贻贝粘附蛋白的启发,可以牢固地锚定在 TiO2 上,从而为引发电聚合提供了接枝单体。与没有仿生引发剂相比,可以实现更快的聚合速率和更大的聚吡咯(PPy)密度。此外,PPy 和 TiO2 之间的界面粘附力显着增强,因此阻抗表征表明电荷转移效率提高,表明这是制造有序有机/无机 p-n 异质结的有前途的策略。