From the flying spot technique (FST) the ambipolar diffusion length and the effective-lifetime of the carriers photogenerated by a moving light spot that strikes a p-i-n junction can be inferred. In this paper, those properties of a p-i-n junction are used together with an optical triangulation principle to determine the velocity of an object that is moving in the direction of a light source. The light reflected back from the object is analysed through an amorphous or a microcrystalline p-i-n structure. Its transient transverse photovoltage is dependent on the velocity of the object. A comparison between the performances of both kinds of devices is presented.
|Number of pages||5|
|Journal||Journal of Non-Crystalline Solids|
|Issue number||PART 2|
|Publication status||Published - 1 Jan 1996|
|Event||16th International Conference on Amorphous Semiconductors - Science and Technology (ICAS 16) - Kobe, Japan|
Duration: 4 Sept 1995 → 8 Sept 1995