Accession Number : ADA314784

Title :   Nanoscale Size Effects on Photoconductivity of Semiconducting Polymer Thin Films.

Descriptive Note : Technical rept.,

Corporate Author : ROCHESTER UNIV NY DEPT OF CHEMICAL ENGINEERING

Personal Author(s) : Zhang, X. ; Jenekhe, S. A. ; Perlstein, J.

PDF Url : ADA314784

Report Date : 09 SEP 1996

Pagination or Media Count : 21

Abstract : Spatial confinement effects in semiconducting polymers were investigated by means of photoconductivity experiments on bilayer photoreceptors consisting of a conjugated poly(2,5-pyridylene benzobisthiazole) charge generation layer and a trap-free tris(p-tolyl)amine doped polycarbonate charge transporting layer. A threefold increase in quantum efficiency for photogeneration and an enhancement of photosensitivity were observed when the semiconducting polymer layer thickness was reduced from approx. 100 to approx. 10 nm. The observed nanoscale confinement effects on photoconductivity are related to the generally small exciton diffusion lengths (5-20 nm) in semiconducting polymers and the interfacial nature of the charge photogeneration process in the bilayers.

Descriptors :   *THIN FILMS, *POLYMERIC FILMS, *SEMICONDUCTING FILMS, *PHOTOCONDUCTIVITY, SPATIAL DISTRIBUTION, REPRINTS, LAYERS, POLYMERS, SEMICONDUCTORS, QUANTUM EFFICIENCY, DIFFUSION, CONFINEMENT(GENERAL), EXCITONS, PHOTOSENSITIVITY, PHOTORECEPTORS.

Subject Categories : Polymer Chemistry
      Physical Chemistry
      Optics
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE