Effect of impurities on the mobility of single crystal pentacene

Abstract

We have obtained a hole mobility for the organic conductor pentacene of µ =35 cm 2 /V·s at room temperature increasing to µ = 58 cm 2 /V·s at 225 K. These high mobilities result from a purification process in which 6,13-pentacenequinone was removed by vacuum sublimation. The number of traps is reduced by two orders of magnitude compared with conventional methods. The temperature dependence of the mobility is consistent with the band model for electronic transport.PACS numbers: 72.80.Le, 81.10. Bk. The infrared experiments were complemented by mass spectrometry analysis, which confirmed that the C = O vibration originates from a pentacenequinone molecule.We have used vacuum sublimation under a temperature gradient as purification method. This technique is effective for separation of impurities from a solid if these 1

Ultra-high mobility transparent organic thin film transistors grown by an off-centre spin-coating method

“…However, due to the lack of reproducibility, we report the maximum of 43 cm 2 Vs À 1 here as we observed similar value (35B43 cm 2 Vs À 1 ) in around 10% of more than 80 devices fabricated. These mobilities are the highest reported values for small-molecular organic semiconductors to date 18,19,[33][34][35] . The high channel current of these devices has been independently verified by three research laboratories ( Supplementary Fig.…”

Electronic transport properties of pentacene single crystals upon exposure to air

“…Pentacene is a good material for electronic devices like field effect transistors. [1][2][3][4][5][6][7][8] However, the results obtained by different research groups are not always consistent. This can be attributed in part to the fact that the performance of the devices depends critically on the environmental conditions.…”

Highly Reliable Carbon Nanotube Transistors with Patterned Gates and Molecular Gate Dielectric

“…16 But pentacene is readily oxidized in the presence of ambient species, yielding molecules such as 6,13-pentacenequinone, which act as charge traps or scattering sites in the semiconductor. 27 Consequently, the transconductance of pentacene transistors exposed to air decays rapidly and significantly. 28 Carbon nanotubes, in contrast, are much more stable against chemical reactions, due to the lack of -CHd moieties.…”