A new type of semiconductor gas sensor based on the n+n combined structure

In this paper, a new type of semiconductor gas sensor based on the n+n combined structure is reported. The combined structure semiconductor gas sensor is a novel gas sensor which is based on the complementary feedback and complementary multiplication principle. The sensor is composed of two sensitive bodies A and B whose conductive types are same. A and B are all n type materials. The results analyzed from theoretical viewpoint showed that when A and B satisfied certain conditions, the sensor not only realized multiplication of selectivity, but also had better thermal stability. According to the sensor’s structure and meeting conditions, we prepared the n+n type gas sensor for gasoline. The experimental results showed that they concurred with theoretical analysis very well.