Abstract
We have carried out a femtosecond (fs) two-photon photoemission study of organic semiconductor copper phthalocyanine (CuPc) film. Furthermore, we have carried out the photoemission (PES) and inverse photoemission (IPES) studies. From the simultaneous PES and IPES measurements, the lowest unoccupied molecular orbital, highest occupied molecular orbital, and ionization potential of CuPc film have been directly determined. From the detailed time-resolved two-photon photoemission measurements, it is found that the relaxation lifetime of excited state is extremely short (all below 50 fs) and monotonously became faster with increasing excitation energy. From these results, we discuss the electronic structure and excited-state dynamics in the organic semiconductor CuPc film.
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