| 초록 |
DNA-base small molecules of guanine, cytosine, thymine, and adenine are adopted for charge injection layer between Au electrodes and organic semicondutor, heptazole(C26H16N2). The heptazole-channel organic field effect transistors (OFETs) with DNA-base small molecule charge injection layer showed higher hole mobility (maximum 0.12 cm2/Vs) than that of pristine device (0.09 cm2/Vs). We characterized the contact resistance of each device by transfer length method (TLM) and found that the guanine layer among all DNA-base materials performs best as hole injection layer leading to the lowest contact resistance. Since the guanine layer is also known to be a proper channel passivation layer coupled with thin conformal Al2O3 layer protecting the channel from bias stress and ambient molecules, we could realize ultra-stable OFETs utilizing guanine/Au contact and guanine/Al2O3 bilayer on organic channel. |
