Energy level diagrams of optimized ambipolar organic thin film transistors used pentacene and C<sub>60</sub>

S. J. Kang; Y. Yi; C. Y. Kim; M. Noh; K. Jeong; K.-H. Yoo; C. N. Whang

doi:10.1117/12.616493

22 September 2005 Energy level diagrams of optimized ambipolar organic thin film transistors used pentacene and C₆₀

S. J. Kang, Y. Yi, C. Y. Kim, M. Noh, K. Jeong, K.-H. Yoo, C. N. Whang

Proceedings Volume 5940, Organic Field-Effect Transistors IV; 594019 (2005) https://doi.org/10.1117/12.616493
Event: Optics and Photonics 2005, 2005, San Diego, California, United States

Abstract

The interface electronic structure of pentacene and C₆₀ layer was investigated in detail by using ultraviolet photoelectron spectroscopy and x-ray photoelectron spectroscopy. The magnitudes of measured interface dipole were 0.11 eV and 0.07 eV for the C₆₀ deposited on pentacene (C₆₀/pentacene) and the pentacene deposited on C₆₀(pentacene/C₆₀), respectively. The obtained C 1s spectra on pentacene/C₆₀ and C₆₀/pentacene indicate no significant chemical bonds existing at the interface. The offsets of the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) at the C₆₀-pentacene interface were 1.29 eV and 0.89 eV for C₆₀/pentacene/Au while it were 1.5 eV and 1.1 eV for pentacene/C₆₀/Au. This resulted in that the HOMO and LUMO offset depend on the deposition order of the organic layers. We fabricated the ambipolar OTFTs used the favorable structure of pentacene and C₆₀, and obtained the field effect mobilities were 0.017 cm²/Vs and 0.007 cm²/Vs for p-channel and n-channel operations.

Citation Download Citation

S. J. Kang, Y. Yi, C. Y. Kim, M. Noh, K. Jeong, K.-H. Yoo, and C. N. Whang "Energy level diagrams of optimized ambipolar organic thin film transistors used pentacene and C₆₀", Proc. SPIE 5940, Organic Field-Effect Transistors IV, 594019 (22 September 2005); https://doi.org/10.1117/12.616493

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