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Optical absorption spectra of CBP, , and doped CBP thin films. The insets show the chemical structures of and CBP.
Electron TOF transients in doped CBP thin films at three different concentrations ((a) 0%, (b) 3.5%, and (c) 7% of ) at . Insets show the double logarithmic plots of the TOF transients. The transit times are marked by the arrows. Hole TOF transient in CBP thin film is also shown in (a) as a dotted line.
Schematic energy level diagrams of charge carrier generation and transport for electron (a) and hole (b). (1) CBP are photoexcited by a laser pulse, (2) excitation energy transfer from CBP to , (3) electron injection from LUMO of to that of CBP, (4) electron transport through LUMO of CBP with shallow trapping at sites, (5) hole injection from HOMO of to that of CBP, and (6) direct hopping of holes between sites.
concentration dependence of and of electron drift mobilities in doped CBP thin films. The values of and of hole drift mobility of CBP thin films are also shown for reference.
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