New pentacene crystalline phase induced by nanoimprinted polyimide gratings

Wei-Yang Chou, Ming Hua Chang, Horng-Long Cheng, Yung-Chun Lee, Chung Chih Chang, Hwo Shuenn Sheu

研究成果: Article同行評審

16 引文 斯高帕斯(Scopus)


Control of the polymorphism of organic semiconductor films is very important in optoelectronic devices, such as organic thin-film transistors, solar cells, and organic light-emitting diodes. Here, we show the use of polyimide nanogratings (PI-NGs) patterned by nanoimprint lithography to control the polymorphism of deposited pentacene films. Interestingly, a new crystalline phase is first found in the pentacene thin-film formed on the PI-NGs. This new phase, with a d-spacing of 1.35 nm, is more stable than the bulk and thin-film phases in the pentacene film, discussed in terms of X-ray diffraction (XRD) measurements and quantum theory calculations. The response mechanism of the formation of this new phase is characterized by XRD and atomic force microscopy; the polymorphism and surface morphology show a strong dependence on the width of PI-NGs. The size-dependent PI-NG responses of the pentacene film can also control the phase transition from the thin-film to the bulk phase.

頁(從 - 到)8619-8626
期刊Journal of Physical Chemistry C
出版狀態Published - 2012 四月 19

All Science Journal Classification (ASJC) codes

  • 電子、光磁材料
  • 能源(全部)
  • 物理與理論化學
  • 表面、塗料和薄膜


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