Charge injection and transport in poly(4,4'-biphenylenevinylene)

We investigated the positive charge carrier transport in poly(4,4'-biphenylenevinylene), PBPV, thin films using Au and Al electrodes. It was observed that Au/PBPV/Al devices present space-charge limited transport, whereas in Al/PBPV/Al devices the charge transport is injection limited. The positive charge carrier mobility was found to be approximately 6×10 -9 cm 2 V -1 s -1 . Applying the Richardson-Schottky thermionic emission theory to Al/PBPV/Al devices we determined the Al/PBPV barrier height for positive charge carrier injection.