Investigations of the Optical and Electronic Properties of Crystalline Organic Materials
Abstract
A theory regarding transport of charge across crystalline molecular organic semiconductor/inorganic semiconductor heterojunctions is developed. It is found that transport under reverse bias, and under low forward bias is determined by carrier diffusion through the organic layer, and by thermionic emission across the heterojunction energy band discontinuity. Using the results of this theory, the valence band discontinuity energy between 3,4,9,10 perylenetetracarboxylic dianhydride and p-Si is directly measured using energy barrier photoemission spectroscopy and the analysis of the temperature dependence of the current-voltage data for this materials system. Apparently, this represents the first measurement of the band offsets between a molecular semiconductor and an inorganic semiconductor, and indicates the existence of relatively trap free heterointerfaces with many potential optical and electrical device applications. Additionally, an organic MBE system is described.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 22, 1988
- Accession Number
- ADA200074
Entities
People
- Stephen R. Forrest
Organizations
- University of Southern California