DEPENDENCIES OF TRANSPORT AND PHOTOLUMINESCENCE ON MORPHOLOGY OF VACUUM-DEPOSITED C-60 FILMS

Electrical transport, its high field effects and photoluminescence are studied in C-60 films deposited at various substrate temperatures. Th e morphology of films is characterized by X-ray diffraction and atomic force microscope. It is found that the electrical conductivity depend s strongly on the morphology and the applied field. High conductivity is obtained for films prepared at high substrate temperatures and high fields. The emission peak shifts to the low energy side for highly cr ystalline films. The results are discussed in terms of the crystallini ty and the delocalization of electrons.