The Effect of Gravity on the Deposition of Thin Films: The Physical Vapor Transport of Copper Phthalocyanine.
Abstract
We describe our progress and final conclusions in our theoretical analysis of the growth of thin films of Copper Phthalocyanine (CuPc) via physical vapor transport using a closed cell ampoule. Three projects are discussed. The first is an analysis of the possibility of convection in the ampoule. This provides the most natural explanation for the experimental differences seen in thin films grown on earth and on the Space Shuttle. However we conclude that convection alone is unlikely to be able to explain these differences. The other two projects examined general features of CuPc crystal growth arising from its very anisotropic shape. The second project modeled the CuPc molecule as a hard square shaped object and examined detailed features of the packing of such objects by a physically motivated deposition algorithm. The third project developed a more realistic intermolecular potential for CuPc involving attractive as well as repulsive intermolecular forces. Crystal structures and diffusion barriers were examined. These considerations have more general applicability to the crystal growth of anisotropic molecules on earth, and we believe further work along these lines is called for. jg
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 31, 1994
- Accession Number
- ADA292997
Entities
People
- J. A. Yorke
- J. D. Weeks
- M. E. Fisher
- T. L. Einstein
Organizations
- University of Maryland