An Electrochemical Approach for Fabricating Organic Thin Film Photoelectrodes Consisting of Gold Nanoparticles and Polythiophene
An Electrochemical Approach for Fabricating Organic Thin Film Photoelectrodes Consisting of Gold Nanoparticles and Polythiophene
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DOI：
10.5857/rcp.2013.2.3.79
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发表时间：
2013-09
期刊：
影响因子：
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通讯作者：
Yukina Takahashi;H. Umino;Sakiko Taura;S. Yamada
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文献类型：
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作者：
Yukina Takahashi;H. Umino;Sakiko Taura;S. Yamada
摘要：提出了一种制备聚噻吩-金纳米粒子复合膜电极的新方法。该方法包括在氧化铟锡（ITO）电极上电沉积金和电聚合2，2 ′-联噻吩。首先，在HAuCl 4的水溶液中，以各种重复时间的脉冲施加电势（0.25 s，-2.0 V vs. Ag/AgCl）将金电沉积到ITO电极上。从扫描电子显微镜照片证实沉积的金纳米颗粒的数密度的显著进步，从4（1次）到25%（15次）。接着，在受控的充电条件（+1.4V vs. Ag线，15 mC/cm 2）下，在上述ITO电极上进行2，2 ′-联噻吩的电聚合。通过光谱和电子显微镜方法对制备的薄膜进行了结构表征。在电子受体（甲基紫精和氧气）的存在下，从样品膜电极的光电流响应进行了研究。光电流强度随着沉积金纳米粒子密度的增加而增加，当沉积金纳米粒子密度达到~ 10%时，光电流强度趋于减小，这表明多余的金纳米粒子表现出猝灭效应，而不是基于沉积金纳米粒子表面等离子体共振诱导的局域电场的增强效应.有机薄膜太阳能电池具有重量轻、易加工、柔韧性好等优点，是下一代可再生能源的理想选择。
ABSTRACT : A novel method of fabricating polythiophene-gold nanoparticle composite film electrodes for photoelectric conversion is demonstrated. The method includes electrodeposition of gold and electropolymerization of 2,2’-bithiophene onto an indium-tin-oxide (ITO) electrode. First, electrodeposition of gold onto the ITO electrode was carried out with various repetition times of pulsed applied potential (0.25 s at -2.0 V vs. Ag/AgCl) in an aqueous solution of HAuCl 4 . Significant progress of the number density of deposited gold nanoparticles was confirmed from scanning electron micrographs, from 4 (1 time) to 25% (15 times). Next, electropolymerization of 2,2’-bithiophene onto the above ITO electrode was performed under controlled charge condition (+1.4 V vs. Ag wire, 15 mC/cm 2 ). Structural characterization of as-fabricated films were carried out by spectroscopic and electron micrographic methods. Photocurrent responses from the sample film electrodes were investigated in the presence of electron acceptors (methyl viologen and oxygen). Photocurrent intensities increased with increasing the density of deposited gold nanoparticles up to ~10%, and tended to decrease above it. It suggests that the surplus gold nanoparticles exhibit quenching effects rather than enhancement effects based on localized electric fields induced by surface plasmon resonance of the deposited gold nanoparticles. Organic thin film solar cells are fascinating candidates for next-generation renewable energy sources because of their potential advantages, such as lightness of weight, easiness for processability, flexibility, and so on.