High-performance organic transistors
Organic field effect transistors (OFET) have so far not achieved major commercial impact, despite their many attractive properties such as low-cost, low-temperature processing, and flexibility. In this talk, I will discuss recent work which addresses some of the shortcomings of the OFET. One key approach is to introduce controlled electrical doping into OFET structures /1/. We have recently shown /2,3 / that this allows for the first time the realization of organic inversion transistors. Furthermore, I will discuss vertical transistor structures which have very short channel length without micropatterning. These structues allow much higher current densities than the lateral OFET despite rather simple processing technology without high-resolution patterning /4,5/. These devices are well suited to drive organic light emitting diodes (OLED), allowing all-organic flexible OLED displays. Recently, we have achieved current densities as high as kA/cm2 and frequencies above 30MHz /6/.
1K. Walzer et al., Chem. Rev. 107, 1233 (2007)
2B. Lüssem et al., Nature Comm. 4, 2775 (2013)
3A.A. Guenther et al., APL 106, 233301 (2015)
4A. Fischer et al., Appl. Phys. Lett. 101, 213303 (2012)
5M.P. Klinger et al., Adv. Mat. 27, 7734 (2015)
6M. P. Klinger et al., Nat. Sci. Rep. 7, 4471 (2017)