Abstract
Abstract Monoclinic thin films of PbPc were deposited on KBr disc substrates by a high-vacuum thermal-evaporation technique. The infrared response of the films was studied with respect to chlorine and iodine exposure in the range 400–4000 cm −1 . Doping with chlorine and iodine led to a generation of acceptor levels within the band gap and led to a splitting of the valence band. The data was analysed to estimate the intraband transition energy between the valence subbands. The ionization energy of the acceptor levels was estimated.
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