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

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

来源：Organic Electronics, 2013, 14(8): 2065-2070.

DOI：10.1016/j.orgel.2013.04.044

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

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)-cm(2)V(-1)s(-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.

• 出版日期2013-8
• 单位中山大学