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

研究了利用多种表面等离子体激元（SP）激发的有机染料薄膜电池的光电特性。电池具有棱镜/Al薄膜/酞菁铜（CuPc）薄膜/Ag薄膜和棱镜/ MgF_2薄膜/Ag薄膜/CuPc薄膜/Al薄膜的纳米界面控制结构。在衰减全反射（ATR）方法中，前者和后者的结构具有Kretschmann和Kretschmann和奥托配置，分别。由于CuPc薄膜具有p型导电性，在CuPc与Al薄膜和CuPc与Ag薄膜的界面处分别形成了肖特基接触和欧姆接触，电池具有肖特基二极管特性。ATR和短路光电流特性已被同时测量作为激光束的入射角的函数。讨论了ATR和短路光电流特性的实验和计算结果。理论上计算了电池中的电场和光散射。推测短路光电流是由SP激发引起的细胞内强光反射引起的。发现有机染料薄膜电池中的光电效应被SP激发增强。对棱镜/Al薄膜/有机染料层/有机薄膜/Ag薄膜结构的电池进行了理论计算。由于导波激励模式，计算的ATR曲线显示出大的下降。结果表明，该吸收与ATR曲线相对应，并且SP激发也会增强吸收。预期利用SP激发可以增强光电效应并且可以获得光电电池的高转换效率。这对太阳能电池、传感器件、光开关等的开发具有很大的优势。

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.