posted on 2018-06-25, 00:00authored byChou-Ting Hsieh, Chin-Yi Chen, Heng-Yi Lin, Cheng-Jui Yang, Tzu-Jung Chen, Kuan-Yi Wu, Chien-Lung Wang
Among
the polycyclic aromatic hydrocarbons, although perylene is
commercially available and possesses higher solubility and stability
than the others, its thin-film structures and organic field-effect
transistor (OFET) performances have been rarely explored. To understand
its potential as an active material in OFETs, the polymorphic behaviors,
packing structures, and OFET characteristics of perylene were carefully
examined. The well-oriented crystal arrays of perylene prepared via
droplet-pinned crystallization delivered the highest hole mobility
among the reported perylene OFETs. Fluorescence microscope, electron
diffraction, and lattice modeling results confirm the polymorphic
behavior of perylene in the solution-processed crystal arrays and
its influences on the OFET performances. The concentration-sensitive
and temperature-sensitive polymorphic behavior of perylene make processing
conditions crucial in the preparation of pure-phase crystal arrays.
The results show the great potential of perylene as an active material
in low-cost and high-performance OFETs. Moreover, the knowledge regarding
the polymorphic behavior of perylene provides opportunity for the
further optimization of perylene-based OFETs.