Abstract
I report why and how I became engaged in the study of organic semiconductors. My first step (1947) in the investigation of organic semiconductors was the measurement of electrical resistance of powdered graphite and carbon materials. Through this observation I accepted the property that carbon particles certainly conduct electric current. I noticed that functional groups bound to the edges of polycyclics in graphite do not cause swelling. I hit upon an idea that polycyclic aromatic compounds with molecular structures similar to fragments of graphite might be electrically conductive. Then, I started measuring the electrical resistance of violanthrone and hence found semiconductive behavior in organic solids (1954). Further I present my encounter with charge-transfer type organic semiconductors.
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