Molecular materials for optoelectronics by supersonic molecular beam growth: co-deposition of C-60 and ZnPc

The preparation of pure and co-deposited films of fullerene (C-60) and zinc phthalocyanine (ZnPc) has been achieved by the use of seeded supersonic mo lecular beam deposition (SuMBE) and compared with more standard methods and a layer by layer growth. The control on the initial state of the molecule and in particular elf kinetic energy, which can be varied up to about 30 eV , is shown to improve control on the optical properties of the films. Go-de posited films, prepared with high beam kinetic energies, show a blue shift in the first absorption band of ZnPc and the presence of a new band centere d at about 1.5 eV that can be attributed to charge transfer between C60 and ZnPc. (C) 2001 Elsevier Science B.V. All rights reserved.