Back to articles
General Papers
Volume: 44 | Article ID: art00001
Image
Organic Photosensor in Elgraphy (II): Photoinduced Current Amplifying Layer
  DOI :  10.2352/J.ImagingSci.Technol.2000.44.3.art00001  Published OnlineMay 2000
Abstract

The authors are actively involved in the development of Elgraphy: a novel image acquiring system that combines electrophotography and liquid crystal technology. The organic photosensor used in Elgraphy (Elgraphic photosensor) exhibits enhanced hole injection induced by a negative space charge trapped at the electrode/photoconductive layer interface, thus giving rise to photocurrent amplification. A new type of photosensor that contains a PICAL (Photoinduced Current Amplifying Layer) between the transparent electrode and the CGL was fabricated. This three layer sensor was found to exhibit significantly larger photocurrent amplification than two layer sensors, that is, the dark current was smaller and the photocurrent was larger in the steady state when the proper voltage was applied. An investigation into how the resistivity of the PICAL and CGL affect the dark current and photocurrent of the three layer photosensor revealed the mechanism involved. The transient variation in the electric field across the PICAL promotes the injection of holes from the electrode, thus enhancing photocurrent amplification. In areas of the sensor that are not exposed to light, the larger resistance of the CGL reduces the voltage across the PICAL, suppressing hole injection from the electrode. In contrast, in areas that are exposed to light, the resistance of the CGL is smaller and the voltage across the PICAL is larger, thus enhancing hole injection.

Subject Areas :
Views 12
Downloads 0
 articleview.views 12
 articleview.downloads 0
  Cite this article 

D. Aoki, M. Kashiwabara, M. Okabe, S. Hikosaka, E. Inoue, "Organic Photosensor in Elgraphy (II): Photoinduced Current Amplifying Layerin Journal of Imaging Science and Technology,  2000,  pp 179 - 187,  https://doi.org/10.2352/J.ImagingSci.Technol.2000.44.3.art00001

 Copy citation
  Copyright statement 
Copyright © Society for Imaging Science and Technology 2000
  Login or subscribe to view the content