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

利用多表面等离子激元（SP）对有机染料薄膜电池的光电特性进行了研究。该电池具有棱柱/铝薄膜/铜酞菁薄膜/银薄膜和棱柱/ MgF_2薄膜/银薄膜/铜酞菁薄膜/铝薄膜的纳米界面控制结构。在衰减全反射（ATR）方法中，前者和后者结构分别具有Kretschmann和Kretschmann和Otto两种构型。由于CuPc薄膜表现为p型导电，在CuPc与Al薄膜和Ag薄膜的界面处分别获得肖特基接触和欧姆接触，电池表现出肖特基二极管的特性。同时测量了ATR和短路光电流特性作为激光束入射角的函数。讨论了ATR和短路光电流特性的实验和计算结果。理论上计算了电池内的电场和光吸收。推测短路光电流是由与SP激发有关的细胞内强光吸收引起的。研究发现，SP激发能增强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。由于导波激励方式的影响，计算得到的ATR曲线有较大的倾角。发现吸收符合ATR曲线，并且在SP激发下吸收增强。期望利用SP激发可以增强光电效应，获得较高的光电池转换效率。这对开发太阳能电池、传感器件、光开关等具有很大的优势。

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.