“a-Se junction” based photodetector driven by diamond cold cathode

In this study, an attempt was made to reduce dark current of amorphous-selenium (a-Se) based photodetector. An electro-chemical method was utilized to incorporate chlorine (Cl) into a-Se, in order to form a blocking junction within a-Se film. Current versus applied voltage characteristic of Cl-incorporated film showed a rectifying characteristic, which, when combined in a photodetector, should reduce the dark current due to the built-in depletion layer. The result suggested an alternative way to enhance the signal-to-noise characteristic of a high-sensitivity imaging devices using a-Se.