Abstract
Thin dielectric films of chlorophyll a deposited onto a tin electrode by the Langmuir-Blodgett technique were investigated with regard to quantum-mechanical tunneling and Schottky emission conductivity mechanisms. The films exhibited conduction characteristics in which the current was directly proportional to the applied voltage, but independent of temperature, in the region 50–500 mV. From a consideration of the nature of the conduction it is concluded that tunneling is the most likely conduction mechanism in this voltage range. At higher voltages, the conduction data is consistent with tunneling, Schottky emission or Frenkel-Poole conduction mechanisms. The significance of tunneling in thin films of chlorophyll with respect to photosynthesis is discussed.
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