ABSTRACT
There has been much interest in electronically functional organic materials with respect to various applications. The interest has been accelerated recently because of successful realization of organic electroluminescent (EL) devices that have given a good prospect for new functional device fabrication with organic molecules [1-4]. Organic devices involve various types of interfaces consisting of organic molecules, inorganic semiconductors, and metals, and their properties are largely influenced by electronic properties of interface region [4]. In Figure l(a, b) basic principles of the organic EL and solar devices are illustrated for ease of understanding the importance of the interface. However, our knowledge on what is happening at the interface is still very limited even for simplified model interfaces.
