Nano-interface Controlled Organic Ultrathin Films and High Efficient Photoelectric Cells Utilizing Multiple Surface Plasmon Excitations

研究了利用多表面等离子体(SP)激发的有机染料薄膜电池的光电特性。该电池具有棱镜/铝薄膜/铜蓝(CuPc)薄膜/银薄膜和棱镜/MgF2薄膜/银薄膜/CuPc薄膜/铝薄膜的纳米界面控制结构。在衰减全反射(ATR)方法中，前者和后者分别具有Kretschmann构型和Kretschmann构型和Otto构型。由于CuPc薄膜具有p型导电特性，因此在CuPc薄膜与Al薄膜和CuPc薄膜与Ag薄膜的界面处可以分别获得肖特基接触和欧姆接触，并且电池具有肖特基二极管特性。同时测量了ATR和短路光电流特性随激光入射角度的变化。讨论了ATR和短路光电流特性的实验和计算结果。对电池中的电场和光吸收进行了理论计算。据估计，短路光电流是由与SP激发相关的细胞中强烈的光吸收引起的。结果表明，SP激发增强了有机染料薄膜电池的光电效应。对棱镜/铝薄膜/有机染料层/有机薄膜/银薄膜结构的电池进行了理论计算。计算的ATR曲线表明，由于导波激发模式的影响，ATR曲线出现了较大的倾角。结果表明，该吸收曲线符合ATR曲线，并被SP激发增强。预计利用SP激发可以增强光电效应，获得高转换效率的光电电池。这对于发展太阳能电池、传感器件、光开关等都是一个很大的优势。

Photoelectric properties have been investigated for the organic dye thin film cells utilizing multiple surface plasmon(SP) excitations. The cells had the nano-interface controlled structures of prism/Al thin film/copper phtalocyanine (CuPc) thin film/Ag thin film and prism/ MgF_2 thin film/Ag thin film/CuPc thin film/Al thin film. In the attenuated total reflection(ATR) method, the former and latter structures have the Kretschmann and both the Kretschmann and Otto configurations, respectively. Since the CuPc thin film exhibits p-type conduction, the Schottky and Ohmic contacts can be obtained at the interfaces between the CuPc and Al thin films and between the CuPc and Ag thin films, respectively, and the cells show Schottky diode properties. The ATR and short-circuit photocurrent properties have been simultaneously measured as a function of the incident angles of the laser beams. The experimental and calculated results of the ATR and short-circuit photocurrent properties were discussed. The electric fields and optical absorptions in the cells were theoretically calculated. It was estimated that the short-circuit photocurrent was caused by the strong optical absorptions in the cells related to the SP excitations. It was found that the photoelectric effect in the organic dye thin film cells was enhanced by the SP excitations. The theoretical calculations were also carried out for the cells with a prism/Al thin film/organic dye layer/organic thin film/Ag thin film structure. The calculated ATR curve showed a large dip due to the guided wave excitation mode. It is found that the absorption corresponds to the ATR curve and is also enhanced by the SP excitations. It is expected that the photoelectric effect can be enhanced and the high conversion efficiency of the photoelectric cells can be obtained utilizing the SP excitations. This is a great advantage for developing solar cell, sensing device, light switch and so on.