| 摘要 |
PURPOSE:To prevent a backflow phenominon of carriers by making an electrical resistance of the first electrode for forming potential well higher than that of the second electrode for forming a potential well. CONSTITUTION:An electrode array in which the first electrodes 31, 32, 31, 32... and the second electrodes 41', 42', 41', 42'... are arranged alternately composes the continuous electrode couples. In this constitution, a film thickness of the second electrodes 41', 42'... is made thicker than that of the first electrodes 31, 32... thereby making an electrical resistance of the first electrodes higher than that of the second electrodes. By such constitution, a moving formation of a potential barrier is always effected prior to a moving formation of a potential well. Accordingly, the electrons as carriers are regulated their transfer direction by the potential barrier constantly and a backflow transfer of the electrons does not occur. |
