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首页> 外文期刊>Materials Chemistry and Physics >Photophysics and photochemistry of colloidal poly (p-phenylinevinylene) (PPV) polymer
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Photophysics and photochemistry of colloidal poly (p-phenylinevinylene) (PPV) polymer

机译：胶态聚对苯乙炔（PPV）聚合物的光物理和光化学

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The photophysical and photochemical behaviour of colloidal PPV polymers has been investigated by emission and photoelectrochemical studies. Emission studies indicated an increased conjugation length for PPV polymers on going from solution to the solid state. The quenching of the emission of PPV polymer by iodine can be used to probe the hole transfer by PPV-iodide complex with subsequent formation of I~(*-). To elucidate the role of hole trapping in the process of photo-generation charge separation in various PPV/OTE electrodes, various electrolytes have been used. The values of photon-to-photocurrent conversion efficiency (IPCE) were evaluated from the short circuit photocurrent measurements at different excitation wavelengths. The close match between the IPCE and the absorption spectra shows that the photosensitization mechanism is operative in extending the photocurrent response of OTE/PPV into the visible. The maximum IPCE observed in the present experiments was ～1.5% in the wavelength region of 425 nm which commensurates well with the reported values [M. Jonforsen, I. Ahmad, T. Johansson, J. Larsson, L.S. Roman, M. Svensson, O. Inganas, M.R. Andersson, Synth. Met. 119(2001) 185]. From the photoelectrochemical response of an OTE/PPV electrode to visible light irradiation, the generation of photovoltage and photocurrent was prompt and was reproducible under several on-off cycles of illumination. Optimization of redox couple, electrolyte and film thickness is essential for improving the performance of PPV-based photoelectrochemical cells.
机译：胶态PPV聚合物的光物理和光化学行为已通过发射和光电化学研究进行了研究。发射研究表明，PPV聚合物从溶液到固态的共轭长度增加。碘对PPV聚合物发射的猝灭可用于探测PPV-碘化物配合物的空穴转移，随后形成I〜（*-）。为了阐明空穴捕获在各种PPV / OTE电极中光生电荷分离过程中的作用，已使用了各种电解质。通过在不同激发波长下的短路光电流测量来评估光子到光电流转换效率（IPCE）的值。 IPCE和吸收光谱之间的紧密匹配表明，光敏化机制可有效地将OTE / PPV的光电流响应扩展到可见光中。在本实验中观察到的最大IPCE在425 nm的波长范围内约为〜1.5％，与报道的值相当。 Jonforsen，I.Ahmad，T.Johansson，J.Larsson，L.S。罗曼（Roman），M.Svensson，O.Inganas，M.R.Andersson，Synth。大都会119（2001）185]。从OTE / PPV电极对可见光辐照的光电化学反应来看，光电压和光电流的产生是迅速的，并且在照明的几个开关过程中是可重现的。氧化还原对，电解质和膜厚度的优化对于提高基于PPV的光电化学电池的性能至关重要。

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