Raman spectroscopy: a powerful tool for characterisation of Ag/3,4,9,10-perylene-tetracarboxylic-dianhydride/GaAs heterostructures

The present contribution emphasises the capabilities of Raman spectroscopy for the characterisation of chemical and structural properties of thin orga nic films. As an example, a perylene derivative is presented, namely 3,4,9, 10-perylene-tetracarboxylic-dianhydride (PTCDA). The focus will be directed to the Raman monitoring of dynamic processes. First, the PTCDA film format ion on GaAs substrates by organic molecular beam deposition will be followe d. The changes in the GaAs bands and PTCDA internal and external vibrationa l modes will be investigated as indicators for the interface formation. Sec ondly, the PTCDA internal modes will be monitored upon the deposition of si lver onto the PTCDA/GaAs heterostructure. (C) 2001 Elsevier Science B.V. Al l rights reserved.