| Charge-carrier mobilities in binary mixtures of discotic triphenylene derivatives as a function of temperature (2002) | |||||||||||
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| PHYSICAL REVIEW VOLUME Charge carrier mobilities binary mixtures discotic triphenylene derivatives function temperature Wegewijs and Siebbeles Radiation Chemistry Department Interfaculty Reactor Institute Delft University Technology Mekelweg Delft The Netherlands Boden Bushby Movaghar Lozman Liu Pecchia and Mason Centre for Self Organising Molecular Systems School Chemistry University Leeds Leeds United Kingdom Received February revised manuscript received April published June The pulse radiolysis time resolved microwave conductivity technique was used study charge transport three binary mixtures triphenylene derivatives and three these components separately the liquidcrystalline mesophase the hole mobilities the mixtures are found order magnitude higher than those the separate components This partly due the more stable columnar structure the mixtures and partly due efficient alloy band formation the crystalline phase the mobility the mixtures only few times lower than that the separate components The ionization energies the components measured cyclic voltammetry are eV apart turns out that this energy difference easily compensated the relatively large charge transfer integrals for hole transport the binary mixtures which was obtained from initio Hartree Fock calculations The mobilities estimated theoretically for ordered systems largely exceed the experimental values This most likely due structural disorder along the columns the material Theoretical estimations the hole mobi | |||||||||||
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