Charge carrier transport in polyimides based on 9,10-bis(p-aminophenyl)anthracene

Electroluminescent properties of anthracene-containing polyimides

“…The presence of high electron affinity diimide (DI) groups in the backbone makes ACPI electronically conductive, while 9,10-diphenylanthracene (DPA) moieties play a role of hole-transporting sites in these polymers. At room temperature, the electron and hole drift mobilities directly measured by conventional time-of-flight (TOF) techniques [7] indicated effective bipolar transport in the ACPI layers. The drift mobility was found [7] to reach the value of 10 À 4 cm 2 /V s at 5.5 Â 10 5 V/cm.…”

“…At room temperature, the electron and hole drift mobilities directly measured by conventional time-of-flight (TOF) techniques [7] indicated effective bipolar transport in the ACPI layers. The drift mobility was found [7] to reach the value of 10 À 4 cm 2 /V s at 5.5 Â 10 5 V/cm. Taking into account the comparatively high PL efficiency in these polymers [5], one would expect to observe EL in the ACPI layers.…”

“…Because charge carrier hopping through shallow traps in the band gap ( Fig. 3a and b) is the most probable conduction mechanism for both types of carriers in these polymers [7], it is reasonable to assume that trapped charges predominantly participate in the recombination. The charge-carrier trapping triggers the electronic and dipole polarization of the medium which leads to the reduction of the trapped charge energy.…”

“…In these structures, an efficient bipolar transport and favorable relative positions of the energy levels are the reasons why bright EL was observed for the unilayer LED. It was determined by the TOF method [7], that the hole " h (ACPI) and electron " e (ACPI) mobility are practically equal " h (ACPI) " e (ACPI) = 2 Â 10 À 5 cm 2 /V s at the electric field (E) of 3.3 Â 10 5 V/cm and T = 291 K. That is one order of magnitude higher than for other aromatic polyimide derivatives which are insoluble in organic solvents, including highly crystalline ones [7]. ACPI is an amorphous semiconducting polymer for which the following expression (eq.…”

Hybrid heterostructures based on aromatic polyimide and semiconductor CdSe quantum dots for photovoltaic applications

“…9 Aromatic polyimides (PIs) are of special interest because they are soluble in common organic solvents and resistant to temperature and oxidation, 10 which may considerably simplify the technology of fabrication of nanohybrid thin film devices. [11][12][13] The photovoltaic effect in cells based on PI and CdSe QD layers was studied earlier. 14 In the present study, we have designed a PI-based photovoltaic cell consisting of an ITO electrode (made of a mixture of In and Sn oxides) sequentially coated with a 20-to 40-nm layer of Cuphthalocyanine (CuPc) and a 100-nm layer of PI doped with CdSe QDs.…”