Ambipolar carrier transport properties in a built-in donor-acceptor discogen

Li Yin Chen*, Fei Hsiung Chien, Yen Wei Liu, Wenjun Zheng, Cheng Yan Chiang, Chia Yi Hwang, Chi Wi Ong, Yi Kang Lan, Hsiao Ching Yang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


Carrier transport in the hexagonal columnar mesophase of a discogen with a built-in dipole moment in the core - hexaalkoxydibenzo[a,c]phenazine (HDBP-3) was investigated. The temperature and field dependences of bipolar carrier mobilities up to the order of 10-3 cm2V-1s -1 in the homeotropically aligned HDBP-3 have been revealed by time-of-flight (TOF) measurement. One-dimensional hopping model was used to discuss the effect of built-in donor-acceptor molecular dipole in the core. The calculation of charge transfer integral also supported the results of mobility measurement. The donor-acceptor molecular dipole in the discogen not only stabilized the mesophase but also contributed to the nondispersive ambipolar nature and substantially enhanced the electron transport in HDBP-3.

Original languageEnglish
Pages (from-to)2065-2070
Number of pages6
JournalOrganic Electronics
Issue number8
StatePublished - 2013


  • Carrier transport
  • Discotic liquid crystal
  • Electron transport
  • Hole transport
  • Time of flight

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