The buried interface of an organic semiconductor at the dielectric has a large on influence on the function of organic field effect transistors (OFETs). The use of vibrational sum frequency generation (VSFG) to obtain structural and orientational information on the buried interfaces of organic thin films has historically been complicated by the signals from other interfaces in the system. Recent advances in modeling the thin film interference effects in VSFG signals have allowed unambiguous assignment of signals from multiple interfaces. We will show how probing the sample with a varying mixture of linear polarizations in the experimental setup in conjunction with modeling can be used to unambiguously assign signals from multiple interfaces in a film of N,N′-Dioctyl-3,4,9,10-perylenedicarboximide (PTCDI-C8) deposited onto SiO2 much simpler than the experimental procedure used to validate the model.

Mixed polarization vibrational sum frequency generation spectra of organic semiconducting thin films

249th National Meeting (2015)

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